Effect of Sintering Temperature on Microstructure and MechanicalProperties of Silicon Nitride Ceramic Balls

Abstract

Abstract: Silicon nitride ceramic balls were prepared by gas pressure sintering process with α-Si₃N₄ powder as raw material and nano Y₂O₃ and Al₂O₃ as sintering aids.The effect of sintering temperature on microstructure and mechanical properties of ceramic balls was investigated.The results show that with the increase of sintering temperature,the Vickers hardness and crush strength of ceramic balls first increase and then decrease,and the fracture toughness increases continuously.The ceramic balls sintered at 1780 ℃ have the optinal comprehensive mechanical properties,the relative density of which is 99%,the Vickers hardness,fracture toughness and crush strength of which is 1 530 HV,7 MPa·m^1/2,and 296 MPa,respectively.

Key words: silicon nitride, ceramic ball, sintering temperature, microstructure, mechanical property

CLC Number:

TQ174

ZHANG Jing, WANG Wenxue, SUN Feng, LIU Lu, DONG Tingxia, ZHANG Baocun. Effect of Sintering Temperature on Microstructure and MechanicalProperties of Silicon Nitride Ceramic Balls[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 252-257.

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