韩天,许晓静,戈晓岚,刘庆辉,吴桂兰,仲奕颖

• 1:江苏大学先进制造与现代装备技术工程研究院

摘要(Abstract)：

研究了Na_2B_4O_7-SiC型共渗剂中添加铁粉、铁丝和扎铁丝方式对TC4钛合金表面盐浴硼氧共渗的影响。采用金相显微镜(OM)、扫描电子显微镜(SEM)及其配备的能谱仪(EDS)、X射线衍射仪(XRD)以及显微硬度计,分析了共渗层表面形貌、物相组成和表面硬度;采用化学热力学分析讨论了铁粉型和铁丝型共渗剂无明显催渗作用的原因,采用电化学模型解释了扎铁丝对盐浴硼氧共渗的催渗机理。结果表明,各组共渗层具有较好的表面形貌,组织均匀;渗层主要由TiB、TiB_(12)、Ti_2B_5和TiB_(25)等钛硼化合物以及TiO_2和TiC相组成;硼砂—碳化硅型、铁粉型和铁丝型共渗层表面硬度依次为677、673和680 HV,性能相似;而扎铁丝型共渗剂中形成电化学效应,具有更好的表面质量,主要由TiB、TiB_(12)、TiC和Al_2O_3相组成,更高的表面硬度(989 HV),比TC4钛合金基体硬度提高了2.75倍,比碳化硅型表面硬度提高了46.04%。

关键词(KeyWords)： TC4钛合金;盐浴硼氧共渗;硬度;化学热力学

Abstract:

Keywords:

基金项目(Foundation): 江苏大学拔尖人才工程基金(1211110001);; 江苏省2015年度普通高校研究生实践创新计划(SJLX15-0481)

作者(Author): 韩天,许晓静,戈晓岚,刘庆辉,吴桂兰,仲奕颖

DOI: 10.13289/j.issn.1009-6264.2017.01.026

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