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
Strong wear resistance and good eolation resistance, ideal for strong abrasion area.
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.
High-strength wear-resistant firebricks have good impact resistance, high strength and long service life.
Wear Resistant Firebricks Physiochemical Index
Item
RSNM-A
RSNM-80
RSNM-75
RSNM-70
Al2O3 % ≥
5.0
80
75
70
SiO2% ≤
/
15
20
25
Bulk density g/cm3 ≥
2.65
2.90
2.80
2.70
Cold crushing strength Mpa ≥
150
100
85
72
Modulus of rupture Mpa ≥
45
15
13
11
Refractoriness ℃
1820
1790
1790
1790
Refractoriness under load ℃（0.2Mpa）
1580
1550
1530
1500
Thermal conductivity w/m·k (350℃) ≤
16.0(1000℃)
1.49
1.49
1.49
Thermal shock resistance / times (1000℃, water cooling)
/
20
20
20
Wear resistant cm3
2.5
5.8
8.3
9.6
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.
