常智敏,潘应君,柯德庆,王盼,黄辽,李子豪

• 1:武汉科技大学材料与冶金学院

摘要(Abstract)：

采用等离子熔覆的方法在GCr15钢表面制备了硼化物覆层。利用光学显微镜、扫描电镜(SEM)及能谱仪(EDS)、X射线衍射仪(XRD)等对熔覆层的组织结构、成分、物相进行分析,并研究覆层在600~850℃的高温氧化行为。结果表明:覆层组织由α-Fe、Mo_2FeB_2、(Mo,Cr,Fe)_3B_2和Fe_(23)(C,B)6组成,与GCr15钢形成良好的冶金结合;熔覆层的高温氧化遵循抛物线规律,氧化激活能Ea=116.77 k J/mol;覆层在600~800℃为抗氧化级,主要以黏结相α-Fe氧化为主;800~850℃覆层为次抗氧化级,硼化物硬质相快速氧化,氧化层中气孔径增大并出现裂纹;熔覆层氧化受MoO_3蒸发速度控制,氧化过程存在元素的扩散。

关键词(KeyWords)： 等离子熔覆;硼化物覆层;显微组织;高温氧化;氧化动力学

Abstract:

Keywords:

基金项目(Foundation): 省部共建耐火材料与冶金国家重点实验室青年基金(2018QN04)

作者(Author): 常智敏,潘应君,柯德庆,王盼,黄辽,李子豪

DOI: 10.13289/j.issn.1009-6264.2018-0097

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