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Ta-Ti-Al-W合金1000℃氧化行为研究
作者:
作者单位:

1.北方民族大学;2.宁夏东方钽业股份有限公司

基金项目:

国家自然科学基金，北方民族大学研究生创新项目


Oxidation behavior of Ta-Ti-Al-W alloy at 1000℃
Author:
Affiliation:

1.North Minzu University;2.CNMC Ningxia orient group Co.L.td,;3.CNMC Ningxia orient group Co.L.td

Fund Project:

National Nature Science Foundation of China(No.51464001),Graduate innovation program of North Minzu University(No.YCX19094)

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    摘要:

    研究了一种Ta-Ti-Al-W合金在1000℃下的氧化行为。利用真空悬浮熔炼法制备Ta-25Ti-18Al-6.5W合金，用XRD、SEM和EDS等方法对合金氧化前和氧化后物相组成和微观形貌进行分析。结果表明，合金在氧化初期符合抛物线规律，随着氧化时间的延长，氧化动力学趋于直线规律。在氧化过程中，Ta优先氧化，但Ti和Al的扩散速率较大，在表面形成了富集。在氧化初期，合金的氧化由合金元素的外扩散所控制，氧化产物为含有Ta2O5、TiO2、Al2O3、WO3的固溶体（Ta2O5ss）和TiO2，在氧化后期，合金中出现氧的内扩散，氧化层出现TiO2，Al2O3富集的最外层， Ta2O5ss的氧化内层，还有氧含量较少的过渡层，从而控制合金的氧化。

    Abstract:

    The Ta-25Ti-18Al-6.5W alloy was prepared by vacuum suspension melting method. The aim of this study was to investigate the oxidation behavior of Ta-Ti-Al-W alloy at 1000℃. The phase composition and microstructure of specimens as-sintered and oxidized were characterized by XRD, SEM, and EDS. It was found that the oxidation kinetics of the alloy followeds the parabolic law at first,and then, changed into the linear law. During the oxidation process, Ta can be oxidized preferentially, and the enrichment areas of TiO2 and Al2O3 were observed in the surface of oxide scale,because of the higher diffusion rates of Ti and Al. In the initial stage,the oxidation was controlled by external diffusion of alloying elements. The oxidation layer mainly composed of the TiO2 and Ta2O5 solid solution of WO3, TiO2, Al2O3. With the increasing of oxidation duration, the oxides scale which controlled the oxidation process shows different layer structure: an outer layer mainly composed of TiO2 and Al2O3, a Ta2O5 solid solution inner layer and a transition layer with less oxygen content.

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李佳欣,陈宇红,白掌军,李宁,程越伟. Ta-Ti-Al-W合金1000℃氧化行为研究[J].稀有金属材料与工程,2021,50(1):195~200.[李佳欣,Chenyuhong, Baizhangjun, Lining, Chengyuewei. Oxidation behavior of Ta-Ti-Al-W alloy at 1000℃[J]. Rare Metal Materials and Engineering,2021,50(1):195~200.]
DOI：10.12442/j. issn.1002-185X.20200049

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  • 收稿日期:2020-01-19
  • 最后修改日期:2020-02-17
  • 录用日期:2020-02-21
  • 在线发布日期: 2021-02-05

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