热等静压ZrO_2-Y_2O_3陶瓷的组织结构与性能

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热等静压ZrO_2-Y_2O_3陶瓷的组织结构与性能

周玉¹, 雷廷权¹, 佐久间健人²

1. 哈尔滨工业大学 ;2. 东京大学

收稿日期:1989-09-25 修回日期:1990-02-01 出版日期:1990-09-25 发布日期:1990-09-25

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIP AND AGED ZrO_2-Y_2O_3 CERAMICS

Zhou Yu¹, Lei Tingquan¹, Sakuma²

1. Harbin University of Technology;2. The University of Tokyo

Received:1989-09-25 Revised:1990-02-01 Online:1990-09-25 Published:1990-09-25

摘要/Abstract

摘要： 本文采用透射电镜中电子衍射与暗场技术、X射线衍射及电子探针等方法,研究了热等静压及热等静压后时效处理的ZrO_2-5mol％Y_2O_2陶瓷的组织结构并测定力学性能。结果表明:经冷等静压成型,1500℃烧结,再于1450℃热等静压试样为c+t双相混合晶粒组织,且c相晶粒内有呈“tweed”形态的t相析出物。试样再经1100℃,1000h时效后,形成“tweed”组织,可使弯曲强度从565MPa提高到990MPa,断裂韧性也有所改善;而提高温度至1400℃时效100h,则形成“colony”组织,使强度显著下降至低于无时效组织。

关键词: 氧化锆陶瓷, 扩散析出, 热等静压

Abstract: The microstructure and mechanical properties were studied for hot-isostatic-pressing (HIP) and aged ZrO2-5 mol% Y2O3 alloy by means of TEM and XRD. It was shown that comparing with the as-received state (HIP, not aged), the "tweed" structure obtained in early stage of aging (1100℃) generated a combination of high strength and high fracture toughness (bending strength increased from 565MPa to 990MPa). However, when it transforms into "colony" structure in later stage of aging (1400℃), the strength decreases to a value much. lower than that of the as-received alloy as a result of t-ZrO2 precipitation and the increase of Y2O3 content in the matrix.

Key words: zirconia ceramied, diffusional precipitation, HIP

周玉;雷廷权;佐久间健人. 热等静压ZrO_2-Y_2O_3陶瓷的组织结构与性能[J]. 航空学报, 1990, 11(9): 487-495.

Zhou Yu;Lei Tingquan;Sakuma. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIP AND AGED ZrO_2-Y_2O_3 CERAMICS[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1990, 11(9): 487-495.

E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

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热等静压ZrO_2-Y_2O_3陶瓷的组织结构与性能

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIP AND AGED ZrO_2-Y_2O_3 CERAMICS

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