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Oxidation behavior of the thin layr formed on yttrium and niobium coated TiAl alloys at high temperatures.

高温下钇和铌涂层 TiAl 合金上形成的薄层的氧化行为。

基本信息

批准号：
07650832
负责人：
INOUE Hirobumi
金额：
$ 1.41万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650832/
关键词：
High temperature oxidation oxide layr Titanium aluminide Yttrium Niobium

项目摘要

Formation and the high temperature oxidation of the Y and Nb coating layrs have been investigated on the titanium-aluminum alloys, followed by heating under the low oxygen atmosphere at high temperatures. Angle-resolved X-ray photoelectron spectroscopy has been used for characterizing the thin oxide layrs and scales formed by oxidation at high temperatures.The following results are summarized.1) The effective thickness of the thin oxide layr on the uncoated TiAl alloy was estimated to be 5.0nm from the relationship between the concentration of titanium and aluminum and the take-off angle by coupling with a model, which consists of a contaminated layr and a titanium concentrated oxide layr on the matrix (the aluminum riched oxide layr). The present results suggest the predominant oxidation of titanium and the aluminum enrichment in the inner oxide layr.2) Composition ratios of the oxidation states of titanium and aluminum were estimated in the oxide layr. It is also interesting to note that the oxide layr contains titanium and aluminum of oxidation states to be lower than Ti (II) and Al (III), respectively, obtained from the Ti2p and Al2p intensity data as a function of the take-off angle by the curve fitting method.3) In the Y coated alloy, the predominant oxidation of aluminum occurs. The concentrations of Al (III) and Ti (II) increase and Ti (IV) decreases in the oxide layrs. The characterization is more emphasized in the Al-Y coated alloy. Nb does not affect the oxidation states of titanium and aluminum in the oxides layr of the TiAl alloy.4) Adhesion is improved of the scale to the substrate of TiAl, Al coated and Al-Y coated alloy.

研究了钛铝合金表面Y、Nb涂层的形成及高温氧化过程，并在高温低氧气氛下进行了加热处理。利用角分辨X射线光电子能谱（XPS）对TiAl合金高温氧化形成的氧化膜和氧化皮进行了表征，得到以下结果：1）根据钛、铝浓度与起飞角的关系，结合模型估算了TiAl合金表面氧化膜的有效厚度为5.0nm，其由基体上的污染层和钛浓缩氧化物层（富铝氧化物层）组成。结果表明，钛的氧化占主导地位，铝在内氧化层中富集。2）估算了钛和铝在氧化层中的氧化态组成比。还有趣的是，注意到氧化物层含有氧化态分别低于Ti（II）和Al（III）的钛和铝，这是通过曲线拟合方法从作为起飞角的函数的Ti2p和Al2p强度数据获得的。3）在Y涂覆的合金中，发生铝的主要氧化。在氧化层中Al（III）和Ti（II）的浓度增加，Ti（IV）的浓度减少。在Al-Y涂层合金中更强调表征。Nb对TiAl合金氧化层中Ti和Al的氧化态没有影响。4）TiAl、Al涂层和Al-Y涂层合金氧化膜与基体的结合力都有所提高。