使用基于Ti的合金屏障层增强基于CoSb的热电接口的界面稳定性和机械强度
Lixia Zhang1, Hui Pan1, Zhan Sun1
1State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
ACS applied materials & interfaces
|December 16, 2023
概括
多相Ti基合金通过防止脆相形成,提高了基于CoSb3的热电发电机的界面稳定性和机械强度. 这提高了热电连接的耐用性,用于发电应用.
科学领域:
- 材料科学 材料科学 材料科学
- 热电学是一种热电学.
- 固态化学 固态化学
背景情况:
- 基于CoSb3填充的斯库特鲁迪特 (SKD) 是可用于发电的热电材料.
- 它们的实际应用受阻于它们与铜电极相连时的界面稳定性和机械强度不佳.
研究的目的:
- 为基于CoSb3的热电连接开发多相Ti基合金屏障层.
- 为了防止脆 TiCoSb 阶段的形成,并增强界面稳定性和机械强度.
主要方法:
- 设计的Ti80NbxCo20屏障层 (x = 0,5,10at.%) 基于热膨胀系数匹配.
- 利用传输电子显微镜来分析界面微观结构.
- 在接接头上进行了老化测试和切削强度测量.
主要成果:
- 基于Ti的合金屏障层有效地防止了连续脆 TiCoSb 阶段的形成.
- 接口微观结构显示了各种Ti-Sb-Co相的均分级分布.
- 用Ti75Nb5Co20屏障层制的接接头在823K老化后保持了21MPa的剪切强度,持续了360小时.
结论:
- 基于Ti的多相合金屏障层显著提高了基于CoSb3的热电连接的界面稳定性和机械强度.
- 开发的Cu/CuSnP/Cu/Ti75Nb5Co20/Ce-SKD接接头在发电应用中表现出色的性能.
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