The Effect of Diluent Type on Silicon Nitride Powders by Combustion Synthesis
LI Fei1, CUI Wei1,2, TIAN Zhaobo1, ZHANG Jie1, DU Songmo1, CHEN Zhanglin1, LIU Guanghua1,*
1 School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Foshan (Southern China) Institute for New Materials, Foshan 528000, Guangdong, China
Abstract: Si3N4 powders were prepared by combustion synthesis in N2 with silicon powder as reaction raw material. A certain amount of diluent was added in order to obtain high α-phase Si3N4 powders with good sintering activity. The silicon powder, diluents and NH4Cl were uniformly mixed in the certain mass ratio (46∶49∶5) and used to prepare Si3N4 powders by combustion synthesis under 6 MPa N2 pressure, in which the diluents were α-Si3N4, β-Si3N4 and BN powders with the particle size of 3 μm. The phase composition and microstructure of the products were studied by X-ray diffractometer, scanning electron microscope and X-ray energy spectrum, and the effect of diluent on Si3N4 powders by combustion synthesis was analyzed. The results showed that the highest temperatures of samples with α-Si3N4 and β-Si3N4 as diluents were higher than 1 700 ℃, and the contents of newly formed α-Si3N4 were less than 40% (mass fraction) in the prepared products. With 3 μm BN as diluent, the highest temperature of combustion synthesis was slightly higher than 1 500 ℃, and the content of newly formed α-Si3N4 in the prepared product was higher than 90% (mass fraction). α-Si3N4 particle in the product was in the shape of claw or cauliflower, and β-Si3N4 particle was in the shape of prismatic. The particle size distribution of Si3N4 powders with different phases were more uniform. Finally, compared with Si3N4 powder as diluent, BN powder as diluent can reduce the maximum reaction temperature of combustion synthesis and effectively isolate silicon melt, thus increasing the α phase content of Si3N4 product.
李飞, 崔巍, 田兆波, 张杰, 杜松墨, 陈张霖, 刘光华. 稀释剂种类对燃烧合成氮化硅粉体的影响[J]. 材料导报, 2022, 36(10): 21030087-4.
LI Fei, CUI Wei, TIAN Zhaobo, ZHANG Jie, DU Songmo, CHEN Zhanglin, LIU Guanghua. The Effect of Diluent Type on Silicon Nitride Powders by Combustion Synthesis. Materials Reports, 2022, 36(10): 21030087-4.
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2022, Vol. 36 
