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·m1/2, and 296 MPa, respectively.
Key words: silicon nitride; ceramic ball; sintering temperature; microstructure; mechanical property
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