What are the combinations of silicon carbide refractories?
Oct 14, 2024
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Silicon carbide refractory It is 10%-40% of bonded clay and silicon carbide particles mixed together, pressed or rammed molding, fired in an ordinary oven. Clay silicon carbide is used in Muffle furnaces for zinc smelting furnaces and ceramic furnaces.
In fact, most use SiO2 as a binding phase. It is a mixture of 5%, 10% SiO2 powder or fine quartz powder with SiC particles. Sometimes a flux is needed, which is baked in a regular oven after pressing and forming. It is characterized by the coating of SiO2 film on SiC particles during cooking and use, which has much better oxidation resistance than Clay-SiC and high temperature resistance. This product is widely used as a baking dish for porcelain firing (1300), and its service life is more than twice that of Clay-SiC. Al2O3 powder and SiO2 powder are added to the composition, pressure molding, and Al2O3 and SiO2 are combined to form mullite in the sintering process. In the process of use, the SiO2 formed by the oxidation of SiC also forms mullite with the Al2O3 part. This material has good thermal shock stability and is widely used in the manufacture of porcelain plates and plates. Silicon metal powder and silicon carbide sand are mixed and formed, and fired under nitrogen protection. Si reacts with N2 to form Si3N4 to bind SiC. This material is widely used in the manufacture of silicon carbide brick for blast furnace, refractory stoves and so on. Using SiC as raw material, SiC suspension is made by proper particle separation and the addition of surfactants, and in Ar atmosphere or sintering furnace casting (can also be pressurized molding) more than 2000 high temperature vacuum sintering, SiC evaporation and condensation and recrystallization at the junction of SiC particles to bind SiC particles. It has the characteristics of high temperature resistance, strong oxidation resistance and good thermal shock stability, and is a high temperature resistant engineering material. Kilns in the ceramics and grinding wheel industry use R-SiC beams to build kiln carts that can be used up to 1600 degrees.
