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首页> 外文期刊>Materials Science and Engineering >Bimetallic low thermal-expansion panels of Co-base and silicide-coated Nb-base alloys for high-temperature structural applications
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Bimetallic low thermal-expansion panels of Co-base and silicide-coated Nb-base alloys for high-temperature structural applications

机译:钴基和硅化物涂覆的Nb基合金的双金属低热膨胀板,用于高温结构应用

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摘要

The fabrication and high temperature performance of low thermal expansion bimetallic lattices composed of Co-base and Nb-base alloys have been investigated. A 2D sheet lattice with a coefficient of thermal expansion (CTE) lower than the constituent materials of construction was designed for thermal cycling to 1000℃ with the use of elastic-plastic finite element analyses. The low CTE lattice consisted of a continuous network of the Nb-base alloy C-103 with inserts of high CTE Co-base alloy Haynes 188. A new coating approach wherein submicron alumina particles were incorporated into (Nb, Cr, Fe) silicide coatings was employed for oxidation protection of the Nb-base alloy. Thermal gravimetric analysis results indicate that the addition of submicron alumina particles reduced the oxidative mass gain by a factor of four during thermal cycling, increasing lifetime. Bimetallic cells with net expansion of 6 ×10~(-6)/℃ and 1×10~(-6)/℃ at 1000℃ were demonstrated and their measured thermal expansion characteristics were consistent with analytical models and finite element analysis predictions.
机译:研究了由Co基和Nb基合金组成的低热膨胀双金属晶格的制备及其高温性能。利用弹塑性有限元分析,设计了一种热膨胀系数(CTE)低于结构组成材料的二维片晶格,以将其热循环至1000℃。低CTE晶格由Nb基合金C-103的连续网络和高CTE Co基合金Haynes 188的插入物组成。一种新的涂层方法,其中将亚微米氧化铝颗粒掺入(Nb,Cr,Fe)硅化物涂层中用于Nb基合金的氧化保护。热重量分析结果表明,亚微米氧化铝颗粒的添加将热循环过程中的氧化质量增加降低了四倍,从而延长了使用寿命。证明了双金属电池在1000℃下的净膨胀为6×10〜(-6)/℃和1×10〜(-6)/℃,其热膨胀特性与分析模型和有限元分析预测一致。

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  • 来源
    《Materials Science and Engineering》 |2011年第12期|p.3973-3980|共8页
  • 作者单位

    Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA;

    Materials Department, University of California, Santa Barbara, CA 93106-5050, USA;

    Materials Department, University of California, Santa Barbara, CA 93106-5050, USA;

    Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA ,Materials Department, University of California, Santa Barbara, CA 93106-5050, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    oxidation low thermal expansion composite structures cobalt alloy niobium alloy;

    机译:氧化低热膨胀复合结构钴合金铌合金;

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