Ammonia Formation Caused by the Presence of Water in the Wet Grinding of Silicon Nitride Powder

摘要

Si3N4 powder (amorphous, alpha-, and beta-Si3N4) was mixed with MeOH containing 8.87 mol. % H2O and ground. The NH3 generation rapidly increased after a grinding time of 100 hours. Silicon nitride sintered material was chosen as one of the high temperature, high strength structural materials and studies of the control of the raw material powder, preparation of the sintered body (finding the right assistant, hot press, high pressure sintering, fracture toughness and oxidation at high temperature were performed.