袁有录,李铸国

• 1:湖北汽车工业学院材料工程系
• 2:上海交通大学材料科学与工程学院

摘要(Abstract)：

采用同轴送粉等离子熔覆工艺在Q235基体上制备了多层65%Ni60A-35%WC体积梯度涂层。采用OM、SEM、EDS、XRD等研究了涂层与基体、涂层与涂层的界面及组织特征,测量了涂层的硬度(HRC)。结果表明:涂层与基体界面处元素Cr、Ni由涂层向基体扩散;靠近界面约223μm范围内基体内的晶粒尺寸约长大了1.75倍;梯度涂层内部界面上层与层枝晶交错生长,形成联生结晶;梯度涂层由下至上的组织特征为:粗大树枝晶逐渐过渡为细小杂乱无方向性的致密组织;WC颗粒周围的Ni与基体Fe互熔,形成冶金结合;梯度涂层物相成分主要由Cr2Ni3、FeCr0.29Ni0.16C0.06、Fe3Ni2、CrFe7C0.45、BNi2、WC等组成;梯度涂层内硬度(HRC)值与65%Ni60A-35%WC体积分数成正相关关系。

关键词(KeyWords)： 等离子熔覆;65%Ni60A-35%WC;体积梯度涂层

Abstract:

Keywords:

基金项目(Foundation): 科技部国际科技合作基金(2009DFB50350);; 湖北省教育厅科学研究项目(Q20122304);; 湖北汽车工业学院博士科研基金(BK201205)

作者(Author): 袁有录,李铸国

DOI: 10.13289/j.issn.1009-6264.2012.11.026

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