Dec 24 2018
High Zirconia Blocks

High Zirconia Blocks Description

High zirconia blocks are also called pure zircon bricks, their principle crystalline phase is zircon. Raw material of high zirconia block is zircon sand, with about 90% of zircon by weight. Zircon fine ore has very small granularity, so is not suitable to produce refractory bricks directly. To make coarse granule pure zircon firebricks, zircon fine ore should be pre-sintered or fused into zircon clinker. After sintering, the density of zircon fine ore is increased, bulk density can reach to 3.5g/cm3.

High Zirconia Blocks Characteristics

The weight percent of ZrO2 in pure zircon refractory is about 65%. High zirconia block is almost completely consisted of zircon crystals, only a little amount of glass phase and free ZrO2 appears in it. The true density of high zirconia blocks is about 4.55g/cm3, max. 4.62g/cm3. Ordinary zirconia block’s bulk density is between 3.6~3.8g/cm3, apparent porosity is higher than 13%. Dense zirconia brick’s bulk density is between 3.8~4.0g/cm3, apparent porosity is about 5%. High dense zirconia brick’s bulk density is larger than 4.0g/cm3, apparent porosity is less than 1.0%.

High zirconia blocks have very high viscosity even in high temperature, so its refractoriness is high, usually higher than 1825℃. The cold crushing strength of high zirconia bricks is between 100~430Mpa, modulus of rupture can reach to 17.8~76.3Mpa, refractoriness under load(RUL) is higher than 1650℃. With the reduce of mineralizer quantity and the increasement of sintering temperature, RUL can reach to 1750℃. So high zirconia bricks is a high grade firebricks which can resist high temperature load action and mechanical abrasion.

Zircon has low thermal expansion rate, so high temperature sintered zirconia blocks or fused cast zirconia blocks has good volume stability. From room temperature to 1400℃, its thermal expansion rate is only 0.5%. Refiring for 2 hours at 1500℃, residual shrinkage rate is only 0.04%~0.20%.

High dense zircon refractory will have lower thermal shock resistance if there is no corase granules. But if it is composed of multi-granularity particles, thermal shock resistance will be significantly improved.

 High zirconia blocks have good resistance to molten metals & molten slag corrosion and permeation. High dense zirconia refractory has more better performance, for example, the extent of basic molten slag corrosion is only 1/3 of mullite refractory.

Fused high zirconia blocks have the characteristics of high corrosion resistance, low foaming rate and stone rate, almost no pollution to the glass liquid.

High Zirconia Blocks Physiochemical Index

 

Item

RS-G88RS-G95
Chemical Composition %ZrO2≥8993.6
SiO2≤95.3
Al2O3≤11
Na2O≤0.050.51
Others≤1.61
Physical PropertiesCold Crushing Strength (MPa)≥400400
True Density (g/cm³)Typical5.15.3
Liner Thermal Expansion (%)1000℃0.650.7
1500℃0.10.3

High Zirconia Blocks Application

Zircon refractory are mainly used in continuous casting ladle inner lining and other parts where suffers severe molten slag corrosion. High zirconia blocks are also used for the masonry of copper and aluminum smelting furnaces casting nozzles. Besides, high zirconia blocks can also be used in glass kilns, where contacts with glass liquid directly and upper structure, as well as separation bricks between fused cast zirconia corundum bricks and silica bricks. Fused high zirconia blocks are suitable for various glass furnaces, especially high quality glass furnaces and special glass furnaces, such as glass bath wall, throat, electrode bricks and so on.

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    Dec 24 2018
    Sialon Bonded Sic Refractories

    Sialon Bonded Sic Refractories Description

    Sialon bonded SiC refractories are normally β-Sialon bonded SiC material. Sialon is the general name of compounds consisted of Si, Al, O, N and other elements. β-Sialon has many similar properties of Si3N4 based ceramic material, such as high rigidity, excellent mechanical performance, corrosion resistance, thermal shock resistance, low linear expansion coefficient. Its thermal conductivity is lower than β-Si3N4, but oxidization resistance is better than β-Si3N4, as well as better corrosion resistance to Al, Fe and Zn molten liquid and alkali.

    Sialon bonded SiC bricks are mainly used as inner lining of blast furnace bosh or furnace belly. It is regarded as the second generation of SiC bricks used  for blast furnaces. The principle crystalline phase of Sialon bonded SiC material is SiC, secondary phase is β-Sialon. Sialon bonded SiC bricks have relatively more Al2O3 compared with Si3N4 bonded SiC bricks.

    For blast furnace SiC refractory, SiC content is usually between 70%~80%. With the SiC content, Sialon bonded SiC refractory has slightly higher linear expansion coefficient than Si3N4 bonded SiC refractory, while slightly lower thermal conductivity.

    Sialon Bonded Sic Refractories Characteristics

    Sialon bonded SiC refractory has very excellent high temperature and high temperature mechanical performances, most Sialon bonded SiC refractory’s 1400℃ modulus of rupture(MOR) is higher than cold MOR.

    Sialon bonded SiC refractory also has excellent alkali corrosion resistance. Its alkali corrosion resistance is significantly better than Si3N4 bonded SiC refractory, which makes it more suitale to be used in places of blast furnace where have severe alkali corrosion.

    Sialon bonded SiC has excellent oxidization resistance.

    Sialon bonded SiC has excellent thermal shock resistance.

    Sialon bonded SiC has excellent blast furance slag corrosion resistance.

    Generally speaking, compared with Si3N4 bonded SiC material, Sialon bonded SiC has better basic slag corrosion resistance, iron, aluminum and other molten metal corrosion resistance.

    Sialon Bonded Sic Refractory Application

    Sialon bonded SiC products have been applied in many large scale blast furnaces, molten reduction iron smelting furances (COREX furnace lining, where has severe corrosion damage). Sialon bonded SiC are also used in nonferrous metals industry, such as zinc smelting, aluminum smelting and so on.

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      Dec 24 2018
      The Application Of Silicon Carbide Refractories

      Silicon Carbide Refractory Description

      Due to the excellent high temperature performances of silicon carbide refractory, they are widely used in steel industry, nonferrous metals industry, petrol industry, power plant, chemical industry and so on.

      The Advantages of Silicon Carbide Refractory

      High mechanical strength.

      Good thermal conductivity.

      Excellent thermal shock resistance and abrasion resistance.

      Good slag corrosion resistance and alkali corrosion resistance.

      Excellent oxidization resistance.

      Good erosion resistance to some molten metals.

       SiC refractories applications

      Silicon Carbide Refractory Used In Steel Industry

      Si3N4 and Sialon bonded SiC & corundum SiC composite refractories are mainly used in steel industry. For example, the lower part of blast furnace bosh, belly, tuyere combination bricks, tuyere sleeve, iron runner, cupola inner lining, coke oven head, heating furnace sliding rail, converter and electric furnace tapping hole.

      Silicon Carbide Refractory  Used In Nonferrous Metals Industry

      Oxide bonded SiC, Si3N4, Sialon, Si2N2O bonded SiC refractories are widely used in nonferrous metals ( aluminum, zinc and copper, etc) smelting. Aluminum electrolysis cell inner lining, aluminum refinery furnace lining, zinc retort vessel lining, zinc fine distillation tower tray, ISP furnace condenser and rotor, fine copper smelting stand furnace, ASARCO furnace bosh lower part working lining and holding furnace inner lining, molten metals tube, metal smelting crucible, iron powder reduction smelting sagger, aluminum and zinc liquid temperature testing thermocouple protection tube, aluminum casting ceramic raiser tube and so on.

      In Ceramics Industry

      Oxide bonded SiC, Si3N4 and Si2N2O bonded SiC refractoryies can be used as muffle board and kiln furniture of ceramics kilns, high temperature burning nozzle, glass annealing furnace lining, ceramic sintering furnace lining, muffle furnace inner lining, rotary cement kiln clinker cooler, radiation heating tube, cyclone separator inner lining, etc.

      Silicon Carbide Refractory Used In Metallurgy

      The protective coating tube of radioactive pyrometer, thermocouple pyrometer and pyrophotometer. The blades of ore selecting stirrer. Sand pump inner lining and swirler nozzle.

      Silicon Carbide Refractory Used In Chemistry

      Fertilizer nitriding furnace inner lining, petrol vaporizer, desulfurization furnace and organic scrap incinerator inner lining, heat exchanger and so on.

      Silicon Carbide Refractory Used In Chemical Fiber Industry

      Sand furnace inner lining.

      Silicon Carbide Refractory Used Petroleum Industry

      Spray nozzle, encapsulation element, valve plates and so on.

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        Dec 20 2018
        Wear Resistant Firebrick

        Wear Resistant Firebricks Description

        High strength wear resistant firebricks, or also called abrasion resistant firebricks are shaped refractory materials. Refractory bricks has standard sizes and can be processed as per required dimensions during construction. High strength wear resistant refractory bricks have been very popular in recent years. Abrasion resistant firebricks are usually made by corundum, silicon carbide or other abrasion resistant materials, and processed by special crafts. Wear resistant firebricks have high mechanical strength, high density, good abrasion resistance and so on. Abrasion resistant firebricks are widely used in various kinds of industrial furnaces and kilns, such as high temperature zone, strong mechanical abrasion zone and so on. Among them, silicon nitride bonded silicon carbide bricks has the best wear resistance (room temperature wear resistance is about 1.8cm3).

        Wear Resistant Firebricks Characteristics

        1. Strong wear resistance and good eolation resistance, ideal for strong abrasion area.
        2. The thermal conductivity is good because of pores in refractory brick. Under the unit temperature gradient, the unit heat flow rate through the material is related to the porosity.

        3, good slag resistance, can resist high temperatures slag erosion and corrosion.

        1. High-strength wear-resistant firebricks have good impact resistance, high strength and long service life.

        Wear Resistant Firebricks Physiochemical Index

        ItemRSNM-ARSNM-80RSNM-75RSNM-70
        Al2O3 % ≥5.0807570
        SiO2% ≤/152025
        Bulk density g/cm3 ≥2.652.902.802.70
        Cold crushing strength Mpa ≥1501008572
        Modulus of rupture Mpa ≥45151311
        Refractoriness ℃1820179017901790
        Refractoriness under load ℃（0.2Mpa）1580155015301500
        Thermal conductivity w/m·k (350℃) ≤16.0(1000℃)1.491.491.49
        Thermal shock resistance / times (1000℃, water cooling)/202020
        Wear resistant cm32.55.88.39.6

        Wear Resistant Firebricks Applications

        Wear-resistant  refractory bricks are mainly used for circulating fluidized bed boilers, boiling furnaces and other industrial furnaces. In the past two decades, with the popularization and application of industrial furnaces such as circulating fluidized bed boilers and boiling furnaces, high requirements have been placed on the wear resistance of refractory materials. Traditional refractory materials, such as clay bricks and ordinary high-aluminum bricks, could not meet service life demand. For example, the service life of a typical clay brick in a serious abrasion part of the circulating fluidized bed is only about 3 to 6 months. So wear-resistant refractory bricks are developed, their wear resistance are far better than that of ordinary refractory bricks. Wear resistant firebricks’ service life is between 1 and 2 years.

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          Dec 20 2018
          Silicon Carbide Bricks

          Silicon carbide bricks are high grade refractory material, its main chemical composition is SiC. Silicon Carbide Fire Bricks have both normal temperature and high temperature mechanical strength, good thermal conductivity, small linear change rate, excellent thermal shock resistance, excellent high temperature abrasion resistance and fairly good chemical corrosion resistance. The Fire Bricks in RS Refractory Manufacturer are popularly used in steel industry, nonferrous metal industry, chemical industry, power plants, ceramics industry and so on. 

          silicon carbide bricks
          RS Silicon Carbide Brick for Sale

          Silicon Carbide Bricks Classification

          Silicon carbide bricks can be divided into different categories based on SiC content, binder types and quantity. According to binder types, SiC bricks can be divided into:

          1. Oxide bonded SiC bricks. The bonding phase is Al2O3-SiO2 series silicate, including clay bonded silicon carbide brick, mullite bonded silicon carbide brick and silica bonded SiC brick.
          2. Nitride bonded silicon carbide brick. The bonding phases are Si3N4, Si2N2O, Sialon and other covalance compounds.
          3. Self bonded SiC bricks. Including β-SiC bonded SiC bricks and re-crystallization SiC bricks.
          4. Siliconizing reaction sintered SiC bricks. SiC and free Si consisted engineering ceramics material.

          Normally, SiC products with less than 50% SiC are called semi SiC refractory, including clinker SiC refractory, high alumina SiC refractory, zircon SiC refractory, mullite SiC refractory and Corundum SiC refractory, etc.

          Oxide Bonded Silicon Carbide Brick

          The mineral phases of oxide bonded silicon carbide bricks are quartz, mullite and silicate glass phase. Based on the difference of bonding phases, oxide bonded SiC bricks can be divided into SiO2 bonded SiC bricks, mullite bonded SiC bricks and clay bonded SiC bricks.

          Clay Bonded Silicon Carbide Brick

          Clay bonded silicon carbide bricks contain 50%~90% SiC, binding material is binding clay, usually added in sillimanite, andalusite, kyanite and other mineral fine powder. The sintering temperature is between 1350~1450℃. The quantity and types of binding material can directly affect the performance of clay bonded SiC bricks. With the increase of clay content, oxidization resistance is improved, but thermal conductivity, refractoriness under load temperature, thermal shock resistance and high temperature strength will all decrease.

          Clay bonded SiC refractory are mainly used as muffle boards of various kinds of industrial kilns and furnaces, ceramic kiln furniture ( refractory slab, sagger and so on). But due to the clay bonding phase in SiC refractory, Clay bonded SiC refractory high temperature performance is greatly affected.

          Mullite Bonded Silicon Carbide Brick

          Mullite bonded silicon carbide bricks developed on basis of clay bonded SiC refractory. The bonding raw material are high purity Al2O3 and SiO2 micro powder or fine powder, sometimes sillimanite, andalusite and kyanite fine powders are also added. The bonging phase are mainly mullite, with low glass phase. In mullite bonded SiC bricks, SiC content is between 65%~85%, sintering temperature is between 1350~1500℃. Mullite bonded SiC bricks have significantly better high temperature performance than clay bonded SiC bricks. Mullite bonded SiC bricks are widely used in ceramic industry, nonferrous metals industry, machinery industry and so on.

          Silica Bonded Silicon Carbide Brick

          SiO2 bonded SiC bricks has far better high temperature performance than clay bonded SiC refractory, high temperature modulus of rupture is higher than mullite bonded SiC refractory. Silica bonded SiC bricks are mainly used as kiln furniture.

          Oxide Bonded Silicon Carbide Brick Specification

          ItemClay bonded SiC refractoryMullite bonded SiC refractorySiO2 bonded SiC refractorySiO2 bonded SiC refractory
          Bulk density g/cm32.5/2.70~2.752.78
          Apparent porosity %14~1814~167~85.8
          Cold crushing strength Mpa100/130150
          Modulus of rupture Mpa(1400℃)1324~26/30~50
          Linear expansion coefficient ℃-14.6*10-6/4.9*10-64.8*10-6
          Thermal conductivity W·(m·K)-1(1000℃)11/15.7~16.916.2（1000℃）
          SiC %>85>70≥9089.8
          SiO2 %///8.9
          Al2O3 %///0.5
          Fe2O3 %///0.5
          Silicon Carbide Bricks Manufacturer
          Silicon Carbide Bricks Manufacturer

          Silicon Carbide Bricks Manufacturer

          RS Refractory Bricks Supplier, is one of the silicon carbide bricks manufacturer. If you want to learn more about Silicon Carbide Bricks price,  and more details of Silicon Carbide refractory Bricks. Please Contact Us, we will give you back as soon as possible.

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            Dec 20 2018
            Silicon Nitride Bonded Silicon Carbide Bricks

            Silicon Nitride Bonded Silicon Carbide Bricks Description

            Silicon nitride bonded silicon carbide bricks are the most widely used nitride boned SiC refractories. Nitride bonded SiC materials have many excellent high temperature performances such as high mechanical strength, good thermal conductivity, small linear expansion coefficient, good thermal shock resistance, alkali corrosion resistance, oxidization resistance, molten metal liquid( zinc, copper, aluminum, lead,etc) corrosion resistance, as well as high temperature abrasion resistance. Si3N4 bonded SiC bricks are composite refractory, main crystalline phase is SiC, secondary crystalline phase is α-Si3N4 and β-Si3N4.

            Si3N4 Bonded SiC Bricks Characteristics

            Low apparent porosity.

            Excellent high temperature mechanical strength.

            Good high temperature creep resistance, at 0.2 Mpa load condition, RUL beginning temperature is higher than 1800℃.

            High modulus of rupture.

            Good thermal conductivity.

            Very high alkali corrosion resistance.

            Excellent oxidization resistance.

            Prominent thermal shock resistance.

            Excellent slag corrosion resistance.

            Have strong cryolite corrosion resistance , ZnO corrosion resistance and electrolyte permeation resistance.

            Si3N4 Bonded SiC Bricks Physiochemical Index

            ItemSi3N4 bonded SiC brickSialon bonded SiC brickFine Si3N4 bonded SiC brick
            SiC %75.0473.5466~80
            Si3N4 %22.18/20~30
            Al2O3 %0.37//
            Fe2O3 %0.270.32/
            Bulk density g/cm32.732.722.80
            Apparent porosity %13.314≤11
            Cold crushing strength Mpa229220580
            Modulus of rupture Mpa（1400℃）65.256.7180 (1200℃)
            Linear expansion coefficient ℃-1 (20~1000℃)4.5*10-64.7*10-64.4*10-6
            Thermal conductivity w·（m·K）-1 1000℃18.418.2/

            Si3N4 Bonded SiC Bricks Application

            Si3N4 bonded SiC refractories are widely used in steel industry, nonferrous metals industry, ceramics industry and so on. Blast furnace refractory materials corrosion reasons include: alkali corrosion, CO, Zn, SiO and water vapor oxidization, abrasion, low thermal conductivity, thermal shock and slag corrosion. In light of this condition, Si3N4 bonded SiC bricks are the ideal products for blast furnace inner lining. The service life of silicon nitride bonded silicon carbide bricks inner lining can reach to 10~15 years. It is the first choice of large scale blast furnace inner lining refractory material.

            SiN4 bonded SiC refractory is the best choice of new generation aluminum reduction cell inner lining. It can decrease horizontal electric current, increase side part heat diffusion, decline cell temperature, enhance electric current efficiency and save energy. Besides, the service life of aluminum reduction cell is greatly prolonged. SiN4 bonded SiC bricks have good thermal conductivity, cryolite corrosion resistance, oxidization resistance and scouring resistance. During using, SiN4 bonded SiC bricks inner lining can form a thick and stable protective layer, which in turn effectively prolongs the service life of aluminum electrolysis cell.

            Si3N4 bonded SiC bricks are also used as kiln furniture of ceramic kilns.

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              silicon carbide mullite brick
              Dec 10 2018
              Silicon Carbide Mullite Bricks

              Silicon Carbide Mullite Bricks Description

              Silicon carbide mullite bricks are also called high alumina silicon carbide bricks. SiC mullite brick main mineral phase is SiC and mullite. It can be produced by SiC and bauxite clinker. During high temperature application in kilns, silicon carbide can be oxidized and produce SiO2, which can react will Al2O3 to form mullite (3Al2O3·2SiO2).The synthesized mullite can not only enhance brick’s density and strength, but also form protection film  to prevent further oxidization of SiC. The un-reacted SiC can enhance thermal shock resistance, abrasion resistance and corrosion resistance of silicon carbide mullite bricks.      

              silicon carbide mullite brick

              Silicon Carbide Mullite Bricks Characteristics

              1. Abrasion Resistance

              SiC mullite brick’s principle phases are high rigidity SiC, mullite and corundum, meanwhile, SiC mullite bricks has high structural density, its bulk density is between 2.7 and 3.0g/cm3. So SiC mullite bricks have good abrasion resistance. Silicon carbide mullite brick’s density, strength and abrasion resistance is significantly better than high alumina bricks and magnesia alumina spinel bricks.

              1. Spalling Resistance And Thermal Shock Resistance

              SiC in silicon carbide mullite bricks has high thermal conductivity, small thermal expansion rate, so SiC carbide mullite bricks have good thermal stability, max. thermal shock times can reach to 46 times(1100℃, water cooling).

              1. Insulating Performance

              Silicon carbide mullite brick’s thermal conductivity(≤2.3W·(m·K) is lower than spinel bricks, and thus have better heat preservation effect.

              1. High Temperature Performance

              SiC mullite brick’s refractoriness under load is above 1500℃, max. is 1690℃, can endure high temperature impact and won’t soften or deform.

              silicon carbide mullite bricks

              SiC Mullite Bricks Physiochemical Index

              ItemGM1650GM1600GM1550GM1680
              Al2O3 %63605763
              SiO2+SiC %30303030
              Apparent porosity %17171917
              Cold crushing strength Mpa859090100
              Refractoriness under load ℃ (0.2Mpa)1650160015501680
              Thermal shock resistance(11oo℃, water cooling)10101213
              Bulk density g/cm32.652.602.552.65
              Cold abrasion resistance cm35555
              Thermal conductivity(w/m·k)1.71.71.71.7

              SiC mullite brick

               Silicon Carbide Mullite Bricks Application

              Due to silicon carbide mullite brick’s good abrasion resistance, high refractoriness and thermal shock resistance, it is popularly used in rotary cement kiln sintering zone, transition zone and so on,  where material rolling friction, high temperature thermal stress, temperature fluctuation and material corrosion are severe.

              silicon carbide mullite brick

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                iron trough castable
                Dec 7 2018
                Iron Trough Castable

                Iron Trough Castable Description

                Different iron smelting factories have different design of blast furnace iron troughs, such as iron storing trough and non storing iron trough, single iron trough and multi iron troughs. Blast furnace iron troughs can also be divided into main trough, branch channel, swing channel and slag channel. Different types of refractory materials can be used as per the types of iron troughs. Iron storing troughs in middle and large scale steel mills usually adopt Al-Si-C series castable.

                iron trough castable

                Iron Trough Castable Characteristics

                Blast furnace iron trough should endure iron liquid and molten slag intense scouring, high temperature iron liquid and molten slag chemical corrosion & permeation. So iron trough and slag trough castable should have enough mechanical strength and corrosion resistance. Once there is damage in the trough, it should be patched as soon as possible, which requires iron trough castable has good flowability, few water addition quantity and can be quickly dried. Besides, iron trough lining’s temperature fluctuates greatly, so iron trough castable should also has excellent thermal shock resistance.

                alumina silicon carbide carbon castable

                Iron Trough Castable Physiochemical Index

                ItemDCTC-1DCTC-2DCTC-3DCTC-4
                MaterialAlumina silicon carbide carbon castableAlumina silicon carbide carbon castableAlumina silicon carbide carbon castableHigh alumina silicon carbide castable
                ApplicationMain trough slag lineMain trough iron lineMain trough iron lineMain trough slag line
                Al2O3 %60837756.9
                SiC %37121132
                SiO2 %2.52.5//
                C %1~31~322
                Bulk density g/cm3(1450℃,3h)2.782.982.842.69
                Compression strength Mpa(1450℃,3h)505035.8/
                Reheating linear change rate %(1450℃,2h)-0.2~0.6-0.2~0.6-0.2~0.6-0.1~0.2
                ItemDCTC-5DCTC-6DCTC-7DCTC-8
                MaterialAlumina silicon carbide carbon castableAlumina silicon carbide carbon castableHigh alumina silicon carbide castableHigh alumina silicon carbide castable
                ApplicationMain trough cover topMain trough cover sidesIron troughSlag trough
                Al2O3 %65.367.149.160.4
                SiC %15159.3314
                SiO2 %////
                C %///1~3
                Bulk density g/cm3(1450℃,3h)2.782.982.842.69
                Compression strength Mpa(1400℃,3h)2.522.562.382.68
                Reheating linear change rate %(1400℃,3h)0.22±0.35-0.12±0.5

                So alumina silicon carbide carbon castable is mainly used for the casting of blast furnace iron trough. Alumina silicon carbide carbon castable’s main materials are fused corundum(or sintered corundum, special grade bauxite clinker), graphite contains 90%~95% fixed carbon, silicon carbide and so on. During construction, additives should be added and fully mixed before casting. For slag trough, lower grade of alumina silicon carbide carbon castable can be used, It can not only meet production requirement but also has better economic benefits. High alumina silicon carbide castable, which has excellent abrasion resistance is the best choice for slag line.

                In recent years, quick dry Al-SiC-C castable is developed for casting houses which only have one iron running trough. The development of self flow Al-Si-C castable brings lots of convenience for casting construction. The unit refractory consumption of per ton iron is significantly decreased with the improvement of castable quality.

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                  Non-stick aluminum castable
                  Dec 6 2018
                  Non-Stick Aluminum Castable

                  Non-Stick Aluminum Castable Description

                  Non-stick aluminum castable is mainly used in aluminum smelting furnace, aluminum press casting heat preserving furnace and so on. Although the melting point of aluminum is not high, only about 660℃, aluminum liquid has low viscosity, high permeation ability and high activation property, which makes it have drastic corrosion to refractory furnace lining.

                  aluminum castable

                  The Damage Mechanism Of Refractory Lining

                  1. Aluminum liquid can react with SiO2 in Al2O3-SiO2 series refractory material and produce Al2O3+Si. So the structure of Al2O3-SiO2 refractory will be destroyed, meanwhile, impurity Si will also contaminate aluminum liquid.
                  2. Aluminum liquid can infiltrate into refractory material pores, increases the contacting area of refractory material and change the composition. When the infiltration reaches to a certain depth, accompanied with the reaction of aluminum and SiO2, refractory material will have structural spalling.

                  Non Stick Aluminum Castable Property

                  To solve this problem, refractory material contacting with aluminum liquid should adopt non-stick aluminum castable. Non-stick aluminum castable has high density(low porosity), good high temperature, middle temperature and room temperature strength, and the strength is positively correlated to temperature. Meanwhile, non-stick aluminum furnace castable has good volume stability at different temperature. With the addition of ultra micro powder component, the porosity of non-stick aluminum processing castable is lower than 10%, the average pore aperture is only 0.5μm. So aluminum liquid can’t permeate into non-stick aluminum castable lining. What’s more, composite additives added in castable can increase aluminum liquid’s contact angle with castable lining and significantly strengthen lining’s aluminum liquid permeation resistance.

                  aluminum processing castable

                  Non-Stick Aluminum Castable Physiochemical Index

                  ItemBZL-1BZL -1ABZL-MBZL-FBZL-G
                  Chemical compositionAl2O3≥6065657080
                  Fe2O3≤0.60.50.40.40.3
                  BaO+ZnO+B2O3≥33344
                  Bulk density g/cm3≥2.42.52.652.72.8
                  Compression strength

                  Mpa≥

                  		110℃*24h3540404545
                   1300℃*16h4045455050
                  Rupture strength

                  Mpa≥

                  		110℃*24h510101214
                   1300℃*16h1013131516
                  Linear change rate % (1300℃*3h)0～+0.20～+0.20～+0.20～+0.10～+0.1

                  Non-stick aluminum castable

                  Non-Stick Aluminum Castable Application

                  Non-stick aluminum castable is specially developed for aluminum processing industry, it is mainly used in aluminum melting furnace wall, furnace bottom, degassing tank, launder and fore-tank. No stick aluminum castable is also used for the furnace lining of keeping furnace, aluminum liquid heat preserving furnace, aluminum ladle and so on. Especially suitable for the integral casting of heat preserving furnace and lining of high purity aluminum smelting equipment. Non-stick aluminum castable synthesizes the characteristics of organic binders and inorganic binders, added in certain quantity of new type composite material, can effectively avoid the infiltration of aluminum liquid and significantly prolong the service life of refractory castable lining.

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                    SiC castable
                    Dec 6 2018
                    Coating Resistant Silicon Carbide Castable

                    Coating Resistant Silicon Carbide Castable Description

                    Silicon carbide castable is also call coating resistant silicon carbide castable. It takes SiC as main raw material, pure calcium aluminate cement as binder, added with high efficient water reducing agent and ultra micro powder. Silicon carbide is high grade synthesized refractory material, has a wide range of application in refractory industry. Due to its particular characteristic, SiC has very low adhesion ability with cement raw material.

                    SiC castable

                     Coating resistant castable’s aggregate mainly compromise low bauxite aggregate, scrap ceramics, scrap electroceramics, SiC and so on. Aluminate cement is usually used as binders of SiC coating resistant castable. Usually, cement raw material is hard to adhere to the surface of SiC castable, so the chance of cement raw material agglomeration at kiln tail is greatly decreased. The application of silicon carbide castable in cement kiln, can avoid the coating of cement in kiln, so the output of cement production line will raise correspondingly.

                    coating resistant castable

                    Coating Resistant Silicon Carbide Castable properties

                    Coating resistant SiC castable has good abrasion resistance and corrosion resistance.

                    Good high temperature mechanical strength, high thermal conduction coefficient.

                    Small linear expansion coefficient, excellent thermal shock resistance.

                    Won’t react with cement raw material.

                    Silicon carbide castable has good coating resistance, can significantly decrease coating times.  

                    Coating Resistant Silicon Carbide Castable physiochemical index

                    ItemSiC-30SiC-50
                    Al2O3 % ≤3525
                    SiC ≥3050
                    Bulk density g/cm3(110℃,24h)2.402.50
                    Cold compression strength Mpa (110℃,24h) ≥8070
                    Cold rupture strength Mpa (110℃,24h) ≥98
                    Permanent linear change rate % (1100℃,3h)±0.4±0.4
                    Alkali resistance gradeII
                    Max. working temperature ℃13501400
                    Water addition %6.0~7.05.5~6.5

                      Coating resistant SiC castable

                    Coating Resistant Silicon Carbide Castable Applications

                    Based on SiC content, coating resistant SiC castable can be classified into two types: one is SiC-30, which’s SiC content is no less than 30%, the other is SiC-50, which’s SiC content is no less than 50%. Both SiC-30 and SiC-50 SiC castable can be used in places of new type middle large scale dry cement kiln pre-heater feeding slope, ascending flue, decomposing furnace cone and so on, where cement coating is easy to form.

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