Fabrication of cylindrical Si3N4 ceramics by spark plasma sintering based on the powder bed technology
CAI Peibin1, GU Qiankun1, GUO Weiming1, LUO Sichun2, LIN Huatai1
1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China; 2. School of Mechanical and Electronic Engineering, Pingxiang University, Pingxiang 337055, China
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·m1/2, 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.
蔡培彬, 顾乾坤, 郭伟明, 罗嗣春, 林华泰. 基于粉末床技术放电等离子烧结Si3N4陶瓷圆柱体[J]. 粉末冶金材料科学与工程, 2023, 28(2): 113-119.
CAI Peibin, GU Qiankun, GUO Weiming, LUO Sichun, LIN Huatai. Fabrication of cylindrical Si3N4 ceramics by spark plasma sintering based on the powder bed technology. Materials Science and Engineering of Powder Metallurgy, 2023, 28(2): 113-119.
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2023, Vol. 28 
