STUDIES ON PHASE DIAGRAM AND TRANSFORMATION IN THIN FILMS OF ZIRCONIA ALLOYS

氧化锆合金薄膜的相图及相变研究

• 批准号: 62420046
• 负责人: SUTO Hajime
• 金额: $ 12.93万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62420046/
• 关键词: CERIA; PRECIPITATION; SPUTTERING; THIN FILM; TRANSFORMATION; YTTRIA; 薄膜; イットリア; 状態図; 変態誘起靭性

ZIRCONIA HAS POLYMORPHS OF CUBIC, TETRAGONAL AND MONOCLINIC PHASES FROM HIGH TO LOW TEMPERATURES. WHEN IT IS ALLOYED WITH YTTRIA, LIME OR MAGNESIA, THE HIGH TEMPERATURE PHASES ARE STABILIZED BY THE INTRODUCED OXYGEN VACANCIES. IT IS INTERESTING THAT ZIRCONIA IS STABILIZED BY CERIUM IN SPITE OF THE SAME VALENCE AS ZIRCONIUM. THE PRESENT INVESTIGATION CONSISTS OF TWO PARTS AS FOLLOWS. (1) THE PHASE DIAGRAM OF ZIRCONIA-CERIA SYSTEM WAS DECIDED EXPERIMENTALLY. THE ARCMELTED LOW CERIA ALLOYS WAS TETRAGONAL PHASE CONTAINING TRANSFORMATION TWINS AND DOMAINS LIKE LOW YTTRIA ALLOY, BUT COHERENT PRECIPITATION TAKES PLACE IN THE STEAD OF SPINODAL DECOMPOSITION. (2) THIN FILMS OF ZIRCONIA ALLOYS CONTAINING YTTRIA FROM 2 TO 8 MOL% WERE PREPARED BY MEANS OF RF-SPUTTERING. THE GRAIN SIZE WAS ABOUT 20 NM. THE TETRAGONAL PHASE IN 2 AND 2.5 MOL% YTTRIA ALLOYS WAS TRANSFORMED TO MONOCLINIC PHASE BY AGING AT 200 ゜C AGING, BUT CUBIC PHASE WAS STABLE TO THIS AGING.

从高温到低温，氧化锆具有立方相、四方相和单斜相的多晶态。当它与钇、石灰或氧化镁合金时，引入的氧空位稳定了高温相。有趣的是，虽然氧化锆和氧化锆的化合价相同，但氧化锆却被铈稳定了。本调查由以下两部分组成。(1)实验确定了氧化锆-二氧化锆体系的相图。弧熔后的低铈合金为四方相，与低钇合金一样含有相变孪晶和畴，但发生共格析出而不是旋散分解。(2)采用射频溅射法制备了含氧化钇量为2 ~ 8mol %的氧化锆合金薄膜。晶粒尺寸约为20 nm。在200℃时效下，2和2.5 mol %钇合金中的四方相转变为单斜相，而立方相则保持稳定。

项目成果

Takeshi,Muroi;Jun-ichi,Echigoya;Hajime,Suto: Transaction of the Japan Institute of Metals. 29. 634-641 (1988)

Takeshi，Muroi；Jun-ichi，Echigoya；Hajime，Suto：日本金属学会汇刊。

HAJIME, SUTO: Transaction of the Japan Instisute of Metals.

HAJIME, SUTO：日本金属研究所学报。

TAKESHI MUROI, JUN-ICHI ECHIGOYA AND HAJIME SUTO: "STRUCTURE AND PHASE DIAGRAM OF ZrO_2-CeO_2 CERAMICS" TRANSACTION OF THE JAPAN INSTITUTE OF METALS. 29. 634-641 (1988)

TAKESHI MUROI、JUN-ICHI Echigoya 和 Hajime Suto：“ZrO_2-CeO_2 陶瓷的结构和相图”日本金属学会会刊。