放电等离子烧结制备氧化锆陶瓷及其力学性能

Preparation of Zirconia Ceramics by Spark Plasma Sintering Technique and Their Mechanical Properties

以日本Tosoh纳米氧化锆粉体为原料,采用放电等离子烧结(SPS)技术及无压烧结技术制备了氧化锆纳米陶瓷。运用TEM﹑SEM﹑XRD等对粉体和块体进行分析,比较无压烧结及不同SPS烧结温度的样品显微结构及力学性能。结果表明:在试验范围内SPS烧结样品力学性能随烧结温度升高而升高,抗弯曲强度在1500℃时达到1483MPa,可切削性低于无压烧结组。利用放电等离子烧结技术可以明显提高ZrO2的力学性能,但并不能改善其可切削性能。

Using nano-sized zirconia powder (Tosoh, Japan) as raw material, nano-zirconia ceramics were prepared by spark plasma sintering (SPS) process and pressureless sintering method. Properties of the powder and bulks were investigated by XRD, SEM and TEM to compare microstructure and mechanical property differences between the samples prepared by different sintering methods. It is found that at the experiment limits, mechanical properties are improved with the increasing temperature by SPS process and the bending strength reaches 1483 MPa at 1500 ℃. However, the values of the machinability rate are lower than that of the pressureless sintering group. The use of spark plasma sintering technique could significantly improve the mechanical properties of ZrO2, but could not improve its machinable performance.