摘要
采用新型振荡压力烧结技术制备了高性能氧化锆陶瓷,并系统研究了该工艺中烧结温度对于氧化锆陶瓷中致密度、晶粒尺寸、微观结构以及力学性能的影响。结果表明:在振荡压力烧结工艺下,随着烧结温度的提高,氧化锆试样致密度变化不明显,但晶粒尺寸不断增加,试样表面均几乎无气孔。当目标温度达到1300℃时,氧化锆陶瓷的硬度和抗弯强度均最大,分别为16.6 GPa和1455 MPa。相比常压和热压烧结工艺,振荡压力的引入明显降低了氧化锆陶瓷的致密化温度,且获得了更高的力学强度和断裂可靠性。
Oscillatory pressure sintering technique(OPS) was used to prepare high quality zirconia ceramics.The effects of sintering temperature on the relative density,grain size,microstructure and mechanical properties of zirconia ceramics were investigated.The results show that with the application of oscillatory pressure,the variation of relative densities is not obvious while the grain size significantly increases as the sintering temperature increases.All specimens reach a nearly full density as there is scarcely no pores on the polished surface.The highest hardness and bending strength of 16.6 GPa and 1455 MPa,respectively,are reached when the target temperature reaches 1300℃.Compared with conventional pressureless and hot pressure sintering process,the introduction of oscillatory pressure significantly reduces the densification temperature of zirconia ceramics,and evidently enhances mechanical strength and fracture reliability.
作者
韩耀
李海燕
谢志鹏
王华栋
李淑琴
Han Yao;Li Haiyan;Xie Zhipeng;Wang Huadong;Li Shuqin(Aerospace Institute of Advanced Materials&Processing Technology,Beijing 100074,China;State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第2期639-643,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51427802,51672147)。
关键词
氧化锆
烧结温度
振荡压力烧结
性能
显微结构
zirconia
sintering temperature
oscillatory pressure sintering
property
microstructure
