文化大學機構典藏 CCUR:Item 987654321/45485
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    题名: High temperature electrical properties and oxidation resistance of V-Nb-Mo-Ta-W high entropy alloy thin films
    作者: Chen, YY (Chen, Yen-Yu)
    Hung, SB (Hung, Sheng-Bo)
    Wang, CJ (Wang, Chaur-Jeng)
    Wei, WC (Wei, Wen-Chung)
    Lee, JW (Lee, Jyh-Wei)
    贡献者: 化材系
    关键词: High entropy alloy thin film
    V-Nb-Mo-Ta-W
    Electrical resistivity
    Oxidation
    日期: 2019-10
    上传时间: 2019-12-13 13:46:29 (UTC+8)
    摘要: High entropy alloys (HEA) show outstanding thermodynamic, mechanical or thermal properties as compared with pure metals or binary alloys. Among several kinds of HEAs, the refractory element containing HEAs exhibit relatively high thermal stability and better mechanical properties at elevated temperature. In this study, the V19.2Nb19.4Mo20.3Ta19.5W21.6 high entropy alloy thin films were deposited on the AISI 304 stainless steel substrates by a magnetron sputtering process. The oxidation behavior and electrical conductivities of HEA thin films at different temperatures were evaluated. The body-centered cubic (BCC) structure of HEA thin film can be kept up to 500 degrees C oxidation, and it transferred to V-Nb-Mo-Ta-W based oxides and then turned to iron contained oxide phases when the oxidation temperature increased to 700 degrees C. The electrical resistivity of thin film increased with oxidation temperature. The electrochemical impedance spectroscope (EIS) analysis showed that the total apparent resistivity values of 304SS substrate coated with V19.2Nb19.4Mo20.3Ta19.5W21.6 high entropy alloy thin film at 600, 700 and 800 degrees C were 5.80, 6.91, and 7.71 Omega.cm, respectively. The electrical resistance of the HEA coated sample was contributed by the oxide resistance and interface polarization. Through the electrical property analysis at high temperatures, the HEA thin film can provide a protection layer to the 304SS substrate and kept the sample's high temperature apparent resistivity to a relatively lower value.
    關聯: SURFACE & COATINGS TECHNOLOGY 卷冊: 375 頁數: 854-863
    显示于类别:[化學工程與材料工程學系暨碩士班] 期刊論文

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