利用放电等离子烧结技术,在温度1400℃、压力15 MPa条件下烧结5 min制备了氧化钇稳定的四方多晶氧化锆陶瓷(Y-TZP),研究了原料粉体的粒径(301．9~444．8 nm)对该陶瓷晶粒尺寸和断裂韧性的影响.结果表明：随着粉体粒径的减小,Y-TZP 陶瓷的晶粒尺寸逐渐增大,应力诱导相变量增加,断裂韧性增大；当粉体粒径为301．9 nm时,应力诱导相变量和断裂韧度均达到最大,分别为16．18％(体积分数)和7．06 MPa.m1/2.
The yttria-stabilized tetragonal polycrystalline zirconia ceramics (Y-TZP ) were sintered at temperature of 1 400 ℃ for 5 min under pressure of 15 MPa by using spark plasma sintering.The effects of the raw powder size (from 301.9 nm to 444.8 nm)on the grain size and fracture toughness of Y-TZP ceramics were investigated.The results show that the grain size,the stress-induced phase transformation content and the fracture toughness of the Y-TZP ceramics all increased with the decrease of the powder size.When the powder size was 301.9 nm,the stress-induced phase transformation content and fracture toughness both reached the maximum values,which were 16.18vol% and 7.06 MPa.m1/2 respectively.
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