Influence of Low Temperature Aging on the Flexural Strength of Y-TZP Ceramics

摘要：

　　Low temperature aging (LTD) is an important factor of Y-TZP ceramic as artificial joint femoral head and dental restorative materials in vivo for long-term application.In this paper,the accelerated aging experiments on Y-TZP ceramics were conducted.The t-m phase transition is occurring from the surface to the inside during low temperature aging of Y-TZP ceramics.As content of phase transformation increases,thickness of phase transformation layer increases.While the content of surface monoclinic phase is less,the volume expansion and surface stress caused by phase transformation can make cracks and holes shrink or even close,then the flexural strength increase.As a large number of surface monoclinic phase was generated,due to there are a lot of microscopic defects in the phase transition layer,crystals loose,strength of grain boundary lower than that of not aging area and phase transformation layers fracture in the intergranular mode,that damages the flexural strength.Therefore,the flexural strength increases firstly and then decrease with the increase of surface monoclinic content.

关键词： Low temperature aging Y-TZP Dental Flexural strength

作者: Chen Wang Limin Dong Yuanfu Yi Ning Wen Qingfeng Zan Jiemo Tian

作者单位: Beijing Key Lab of Fine Ceramics,Institute of Nuclear and New Energy Technology,Tsinghua University, General Hospital of Armed Police Forces,Beijing 100069,China General Hospital of Chinese PLA,Beijing 100853,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 1756-1760

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）