摘要
利用放电等离子烧结技术,在温度1 400℃、压力15 MPa条件下烧结5min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(301.9~444.8nm)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301.9nm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·m^(1/2)。
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 16.18vo1% and 7.06 MPa-m1/2 respectively.
出处
《机械工程材料》
CAS
CSCD
北大核心
2016年第10期75-78,共4页
Materials For Mechanical Engineering
关键词
放电等离子烧结
氧化锆
粉体粒径
晶粒尺寸
断裂韧性
spark plasma sintering
zirconia ceramics
powder size
grain size
fracture toughness
