| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| 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,*
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1 School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2 Foshan (Southern China) Institute for New Materials, Foshan 528000, Guangdong, China |
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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.
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Published:
Online: 2022-05-24
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| Fund:China Postdoctoral Science Foundation (2018M641344, 2020T130335). |
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1 Lange H, Wtting G, Winter G. Angewandte Chemie International Edition, 1991, 30(12),1579.
2 Riley F L. Journal of the American Ceramic Society, 2000, 83(2),245.
3 Petzow G, Herrmann M. Structure and Bonding, 2002,102(1),47.
4 Zhang J, Cui W, Li F, et al. Ceramics International, 2020, 46(10),15719.
5 Hardie D, Jack K H. Nature, 1957, 180, 332.
6 Pavarajarn V, Kimura S. Journal of the American Ceramic Society, 2001, 84(8), 1669.
7 Neto E F, Kiminami R H G A. Advanced Powder Technology, 2014, 25, 654.
8 Durham S J, Shanker K, Drew R A. Journal of the American Ceramic Society, 1991, 74, 31.
9 Subrahmanyam J, Vijayakumar M. Journal of Materials Science, 1992, 27, 6249.
10 Mossino P. Ceramics International, 2004, 30(3), 311.
11 Jin H B, Cao M S, Chen Y X, et al. Ceramics International, 2008, 34(5), 1267.
12 Chen Y X, Li J T, Du J S. Materials Research Bulletin, 2008, 43(6), 1598.
13 Mukas'yan A S, Martynenko V M, Merzhanov A G, et al. Combustion, Explosion and Shock Waves, 1986, 22(5), 534.
14 Zhang B L, Zhuang H R, Fu X R. Journal of Inorganic Materials, 1993, 8(4), 433.
张宝林, 庄汉锐, 符锡仁.无机材料学报, 1993, 8(4), 433.
15 Chen D Y, Zhang B L, Zhuang H R, et al. Materials Research Bulletin, 2002, 37, 1481.
16 Gazzara C P, Messier D R. American Ceramic Society Bulletin, 1977, 56(9),777.
17 Jennings H M, Danforth S C, Richman M H. Journal Materials Science Letter, 1979, 14, 1013.
18 Cano I G, Rodri'guez M A. Scripta Materials, 2004, 50(3), 383.
19 Cano I G, Rodri'guez M A, Borovinskayn I P, et al. Journal of the American Ceramic Society, 2002, 85(9), 2209.
20 Longland P, Moulson A J. Journal of Materials Science, 1978, 13, 2279.
21 Suematsu H, Mitomo M. Journal of the American Ceramic Society, 1997, 80(3), 615. |
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2022, Vol. 36 
