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Si_3N_4 powder was synthesized by carbothermal reduction nitridation reaction using sawdust as carbon source and introducing SiO_2 by silica sol immersion.Effects of Si O2 content of silica sol,molding pressure,reaction temperature,reaction duration,and N_2 flow rate on phase compositions and microstructure of resultants were studied. The results show that using7. 5 mass% SiO_2 containing silica sol immersed sawdust as raw materials,the prepared Si3N4 powder is featured with high α-Si_3N_4 content,few impurities,etc. in the conditions of 1 450 ℃ of reaction temperature,9h of reaction duration,400 m L·min- 1of N_2 flow rate and 10 MPa of molding pressure.
Si_3N_4 powder was synthesized by carbothermal reduction nitridation reaction using sawdust as carbon source and introducing SiO_2 by silica sol immersion. Effects of Si O2 content of silica sol, molding pressure, reaction temperature, reaction duration, and N_2 flow rate on phase compositions and microstructure of Resultants were studied. The results show that using 7. 5 mass% SiO 2 containing silica sol immersed sawdust as raw materials, the prepared Si 3 N 4 powder is featured with high α-Si_3N_4 content, few impurities, etc. in the conditions of 1 450 ° C of reaction temperature, 9h of reaction duration, 400 m L · min- 1of N_2 flow rate and 10 MPa of molding pressure.