High Level Material Black Silicon Carbide Powder

Silicon carbide-based refractories were prepared by vibrating pouring + high-temperature nitriding by using black silicon carbide powder, sintered white corundum powder (WFA), silica powder (MS), alumina powder (RA) and calcium aluminate cement (CAC) as the main raw materials, adding different proportions of silicon metal powder. The effects of silicon metal content of 5%, 7%, 9% and nitriding temperature of 1300°C, 1420°C and 1500°C on the flexural strength, phase composition and microstructure of the samples in the cold/hot state were studied.

1.Silicon carbide-based refractories were prepared by vibrating pouring + high-temperature nitriding by using black silicon carbide powder, sintered white corundum powder (WFA), silica powder (MS), alumina powder (RA) and calcium aluminate cement (CAC) as the main raw materials, adding different proportions of silicon metal powder. The effects of silicon metal content of 5%, 7%, 9% and nitriding temperature of 1300°C, 1420°C and 1500°C on the flexural strength, phase composition and microstructure of the sample in cold/hot state, respectively. The results show that the cold and hot strength of the sample increases with the increase of nitriding temperature and the increase of silicon metal content in the raw material.After nitriding at 1420°C, the hot state strength of the sample with silicon metal content of 7% and 9% in the raw material can exceed 50MPa at 1200°C. A large amount of nitride formed in situ combines the particles with the matrix to form a network structure. The formation and structure of nitride play a decisive role in improving the strength of cold and hot states.

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