• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 1991, Vol. 27 ›› Issue (6): 12-17.

• 论文 • 上一篇    下一篇

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ZrO2-Y2O3陶瓷双相（t＋m）组织的复合韧化

周玉;雷廷权;葛启录;佐久间健人   

  1. 哈尔滨工业大学;东京大学
  • 发布日期:1991-11-01

THE MULTIPLE TOUGHENING MECHANISMS OF DUAL PHASE (t+m) STRUCTURE IN ZrO2-Y2O3 CERAMICS

Zhou Yu;Lei Tingquan;Ge Qilu;T Sakuma   

  1. Harbin Institute of Technology The University of Tokyo
  • Published:1991-11-01

摘要： 本文采用TEM及XRD等手段研究了ZrO2-2mol%Y2O3陶瓷的组织结构并测试了力学性能。结果表明：随烧结温度升高，致密度增加，但硬度却随单斜相含量的增多而下降。与单一的四方相（TZP）相比，含有显微裂纹的t＋m（PSZ）双相组织具有更高的断裂韧度。这是由于前者只有相变韧化效果，而后者则同时有相变韧化、显微裂纹韧化及残余应力（应变）韧化的多重复合机理作用的结果。

关键词: 残余应力, 陶瓷, 显微裂纹, 相变

Abstract: The microstructure and mechanical properties were studied for ZrO2-Y2O3 alloys with 2mol% Y2O3 prepared by cold-isostatic pressing (CIP) and pressureless sintering. The results show that Viker’s hardness of the alloys decrease with the appearance of monoclinic phase (m-ZrO2) and increase its content. Comparing with pure tetragonal phase (TZP), the dual-phase (t+m) structure with microcracks possesses a much bigher fracture toughness because there is only transformation-toughening effect in the former, but a multiple mechanism of transformation-toughening, microcrack-toughening, and residual stress (strain)-toughening operates in the later.

Key words: 残余应力, 陶瓷, 显微裂纹, 相变

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