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Ta-Ti-Al-W合金1000℃氧化行為研究
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作者單位:

1.北方民族大學;2.寧夏東方鉭業(yè)股份有限公司

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基金項目:

國家自然科學基金，北方民族大學研究生創(chuàng)新項目


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:

    研究了一種Ta-Ti-Al-W合金在1000℃下的氧化行為。利用真空懸浮熔煉法制備Ta-25Ti-18Al-6.5W合金，用XRD、SEM和EDS等方法對合金氧化前和氧化后物相組成和微觀形貌進行分析。結(jié)果表明，合金在氧化初期符合拋物線規(guī)律，隨著氧化時間的延長，氧化動力學趨于直線規(guī)律。在氧化過程中，Ta優(yōu)先氧化，但Ti和Al的擴散速率較大，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擴散所控制，氧化產(chǎn)物為含有Ta2O5、TiO2、Al2O3、WO3的固溶體（Ta2O5ss）和TiO2，在氧化后期，合金中出現(xiàn)氧的內(nèi)擴散，氧化層出現(xiàn)TiO2，Al2O3富集的最外層， Ta2O5ss的氧化內(nèi)層，還有氧含量較少的過渡層，從而控制合金的氧化。

    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,陳宇紅,白掌軍,李寧,程越偉. Ta-Ti-Al-W合金1000℃氧化行為研究[J].稀有金屬材料與工程,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
  • 錄用日期:2020-02-21
  • 在線發(fā)布日期: 2021-02-05
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