基于粉末床技术放电等离子烧结Si<sub>3</sub>N<sub>4</sub>陶瓷圆柱体

doi:10.19976/j.cnki.43-1448/TF.2022083

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Abstract SiC powders with average particle sizes of 150 μm and 50 μm were mixed with graphite powders with average particle sizes of 150 μm and 50 μm respectively to obtain coarse particle size powder bed (150 μm SiC+150 μm graphite) and fine particle size (50 μm SiC+50 μm graphite); the volume fractions of SiC and graphite in the powder bed were both 50%. Pre-sintered cylindrical Si₃N₄ green body was sintered by spark plasma sintering (SPS) based on powder bed technology. The effects of two different particle size bed powders, pre-sintering temperature (1 400 ℃and 1 500 ℃) and powder bed recovery on the deformation degree, density, phase composition and microstructure of cylindrical Si₃N₄ ceramics were investigated. The research results show that the circular section retention of cylindrical Si₃N₄ ceramic prepared by combining the coarse particle size powder bed, a pre-sintering temperature of 1 500 ℃ and a recycled once powder bed is the best, reaching 93%; the Vickers hardness and fracture toughness are (18.73±0.24) GPa and (3.64±0.23) MPa·m^1/2, respectively. Due to the low sintering temperature (1 500 ℃), the main phase of the as-sintered ceramics is α-Si₃N₄; the grain morphology is equiaxed. This study shows that the shape limitation of the Si₃N₄ ceramics prepared by SPS can be overcame by introducing the powder bed. This technology is expected to realize the preparation of high-performance Si₃N₄ ceramics with complex shapes.

Key words： complex shape nitride silicon powder bed spark plasma sintering circular section retention mechanical property

Received: 30 October 2022 Published: 04 May 2023

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	Articles by authors
	CAI Peibin
	GU Qiankun
	GUO Weiming
	LUO Sichun
	LIN Huatai

Cite this article:

CAI Peibin,GU Qiankun,GUO Weiming, et al. Fabrication of cylindrical Si₃N₄ ceramics by spark plasma sintering based on the powder bed technology[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(2): 113-119.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022083 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I2/113

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