碳化硅砖是以碳化硅为主要原料制成的耐火材料。莫氏硬度为 9。对酸性炉渣更稳定。含 SiC 72% ~ 99%。分为粘土结合、Si3N4结合、Sialon结合、β-SiC结合、Si2ON2结合和再结晶碳化硅砖。一般以黑色碳化硅（SiC含量大于96%）为原料，加入粘结剂（或不加粘结剂），经配料、搅拌、成型、烧成等工序制备而成。主要品种有氧化物结合碳化硅砖、碳结合碳化硅砖、氮化物结合碳化硅砖、自结合碳化硅砖、再结晶碳化硅砖、半碳化硅砖等，具有耐磨性好、耐腐蚀、高温强度高、热震稳定性好、导热系数高、热膨胀系数小等特点。是一种高性能耐火材料。
| 项目/等级 | GM1650 | GM1600 | GM1550 |
|---|---|---|---|
| ω（Al2O3) ≥/% | 65 | 63 | 60 |
| 体积密度 ≥/(g/cm³) | 2.65 | 2.60 | 2.55 |
| 表观孔隙率 ≤/% | 17 | 17 | 19 |
| 冷压强度 ≥/MPa | 85 | 90 | 90 |
| 0.2MPa 耐火地下负荷 T0.6 ≥/℃ | 1650 | 1600 | 1550 |
| 抗热震性（1100℃，水冷）≥/次 | 10 | 10 | 12 |
| 环境温度下的耐磨损性 ≥/cm3 | 5 | ||
| 热膨胀/% | / | ||
1.High Temperature Stability
2.Excellent Fire Resistance
3.High Strength and Wear Resistance
4.Excellent Thermal Conductivity
5.Good Thermal Shock Stability
主要用于制作有色金属冶金甑、铝铸造模具、电炉内衬、铝电解槽内衬、陶瓷窑具和热交换器等。
Clay-bonded silicon carbide bricks are refractory products fired with silicon carbide as the main raw material and clay as the binder. It is characterized by high thermal conductivity, small thermal expansion coefficient, good thermal shock resistance and wear resistance, and is the earliest developed type of silicon carbide brick.
This product is used as kiln furniture for ceramic kiln (shelf board, bracket, sagger, etc.), muffle cover for muffle furnace, lining brick for aluminum refining furnace, retort tank for zinc distillation furnace, cooler for cement rotary kiln, etc.
Silicon nitride bonded silicon carbide brick is a refractory product made of SiC and Si powder and fired by nitriding. It is characterized by Si3N4 as the binding phase. Si3N4 exists between SiC grains in the form of acicular or fibrous crystals, and is an important new refractory material.
Silicon nitride combined with silicon carbide bricks are mainly used as the inner lining of the lower part of the blast furnace body, which is more than double the service life of traditional refractory materials. In addition, it can be used as the lining of the aluminum reduction electrolytic cell and ceramic kiln furniture, which has energy saving, improved service life, and It has the advantages of polluting the environment, and can also be used as a brick for the water-cooled pipe sleeve of the tuyere of a blast furnace.