| 热等静压ZrO_2-Y_2O_3陶瓷的组织结构与性能 |
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| 引用本文： | 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. |
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| 作者姓名： | 周玉 雷廷权 佐久间健人 |
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| 作者单位： | 哈尔滨工业大学
(周玉,雷廷权),东京大学(佐久间健人) |
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| 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。
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| 关 键 词： | 氧化锆陶瓷 扩散析出 热等静压 |
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIP AND AGED ZrO_2-Y_2O_3 CERAMICS |
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| Harbin University of Technology Zhou Yu and Lei TingquanSakuma The University of Tokyo.MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIP AND AGED ZrO_2-Y_2O_3 CERAMICS[J].Acta Aeronautica et Astronautica Sinica,1990,11(9):487-495. |
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| Authors: | Harbin University of Technology Zhou Yu and Lei TingquanSakuma The University of Tokyo |
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| Institution: | Harbin University of Technology Zhou Yu and Lei TingquanSakuma The University of Tokyo |
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| 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. |
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| Keywords: | zirconia ceramics diffusional precipitation HIP |
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