Al2O3- SiC SiC Refractory Material

Al2O3-SiC SiC Refractory Material is a high-quality refractory material that has long been known to people. Al2O3-SiC SiC Refractory Material has high strength, high thermal conductivity, good shock resistance, excellent high-temperature properties such as oxidation resistance, wear resistance and erosion resistance. It has many uses in metallurgy, energy, chemical industry and other industrial sectors. Initially, Al2O3-SiC SiC Refractory Material was based on clay, SiO2, silicate, mullite and other binders. Now high-tech Al2O3-SiC SiC Refractory Material Products have been developed and put into production and application, such as silicon nitride combined with silicon carbide, silicon oxynitride combined with silicon carbide, etc. With the advancement of refractory material production technology, Al2O3-SiC SiC Refractory Material Products are made into refractory materials for various purposes as mentioned above according to different processes, and their high-temperature performance is therefore even better.

 

For example, Si3N4 combined with SiC has a high-temperature flexural strength (1350°C) of 44MPa, which is three times that of ordinary SiC bricks, 20 times that of cast alumina bricks, and 50 times that of clay bricks. It has good antioxidant properties and a maximum surface operating temperature of 1750°C, while ordinary SiC bricks are only 1500°C. Other high-temperature properties such as thermal shock resistance are better than those of ordinary SiC bricks, chrome-aluminum bricks, and clay bricks.

Al2O3-SiC There is a certain thermal stability relationship between the various forms of SiC refractory materials. The α and β crystal forms also transform into each other. When the temperature is below 1600℃, SiC exists in the form of β-SiC. When the temperature is higher than 1600℃, β-SiC slowly transforms into various deformation forms of α-SiC by recrystallization. For α-β transformation, a higher pressure is required, while for β-α transformation, only a lower pressure is required. The transformation between various types of silicon carbide does not produce a volume effect. It is generally believed that the solid solution of trace impurities in SiC affects both the transformation between α and β crystal forms and the transformation of the thermal stability relationship between polymorphs. For example, boron and nitrogen that form solid solutions in SiC can promote α-β transformation, while the presence of impurity Fe promotes β-α transformation. The solid solution of AL accelerates the -4H transformation of SiC and stabilizes the 4H polymorph. SiC is a chemical with strong covalent bonds.

Al2O3-SiC SiC refractory materials still maintain high bonding strength at high temperatures, so SiC has high hardness, large elastic modulus, and excellent wear resistance. SiC will not be corroded by most acid and alkali solutions. For example, (HCL, HNO3, H2SO4, NaOH, HF), oxidation reaction will occur when heated in air, but it often shows the characteristics of passive oxidation. During oxidation, SiC forms a SiO2 film on the surface to inhibit further oxidation of oxygen. In addition, SiC also has excellent thermal conductivity. Pure SiC is an insulator, and doped SiC has a negative temperature coefficient, which can be used as a high-temperature heating element with nonlinear resistance characteristics.

Hot Tags: al2o3- sic sic refractory material, China al2o3- sic sic refractory material manufacturers, suppliers, factory, Refractory Materials for Glass Kiln, Sintered Mullite Bricks