Nitriding sintering method for silicon nitride and silicon carbide combined refractory product
A technology of nitriding firing and refractory products, which is applied in the field of nitriding firing of silicon nitride combined with silicon carbide refractory products, which can solve the problems of incomplete nitriding, low conversion rate, slow nitriding reaction speed, and inability of nitriding reaction Continue to wait for the problem to achieve the effect of solving the incomplete response
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[0034] Example 1:
[0035] Select industrial black silicon carbide with a purity of more than 98%, fine silicon powder and coarse silicon powder as raw materials, and the particle size of fine silicon powder is D 50 It is 15-20μm, the fine silicon powder and industrial black silicon carbide are mixed, formed, dried and other processes to make a 70mm thick brick in the low temperature zone. The coarse silicon powder particle size is D 50 It is 65-76μm, and then the coarse silicon powder and industrial black silicon carbide are mixed, formed, dried and other processes to make 70mm thick bricks in the normal temperature zone, to be fired with the bricks in the low temperature zone, and the bricks in the low temperature zone and the normal temperature zone The volume ratio is 1:5, the highest nitriding firing temperature is monitored at 1400℃, the air outlet is closed after the normal program is kept for 4 hours, and the N is reduced 2 Flow until the nitriding furnace is at normal pres...
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[0036] Example 2:
[0037] Select industrial black silicon carbide with a purity of more than 98%, fine silicon powder and coarse silicon powder as raw materials, and the particle size of fine silicon powder is D 50 It is 10-15μm, the fine silicon powder and industrial black silicon carbide are mixed, formed, dried and other processes to make a 50mm thick brick in the low temperature zone. The coarse silicon powder particle size is D 50 It is 48-65μm, and then the coarse silicon powder and industrial black silicon carbide are mixed, formed, dried and other processes to make 50mm thick bricks in the normal temperature zone, which can be fired with the bricks in the low temperature zone, and the bricks in the low temperature zone and the normal temperature zone The volume ratio is 1:7, monitor the highest nitriding sintering temperature of 1380℃, close the air outlet after 6 hours of heat preservation in the normal program, and reduce N 2 Flow until the nitriding furnace is at normal...
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