曹辉亮,罗承萍,刘江文,伍翠兰

• 1:华南理工大学材料科学与工程学院
• 2:湖南大学材料科学与工程学院

摘要(Abstract)：

对经离子渗氮处理的20钢,进行610℃下不同保温时间的盐浴渗铬,获得了不同时期的复合渗铬层。利用光学显微镜、X射线衍射仪、扫描电镜及能谱仪、透射电镜对这种复合渗铬层的形成过程进行研究。结果表明,复合渗铬层主要由铬氮化合物相组成,其形成是在消耗原离子渗氮化合物层的基础上实现;并且,在复合渗铬初期,复合渗铬化合物层主要由CrN相组成,在复合渗铬后期,原CrN相化合物层的最表层开始转变为Cr2N相,因而形成较致密的Cr2N/CrN双层结构渗铬层。横截面透射电镜观察表明,所制备的Cr2N/CrN双层结构为纳米结构渗铬层(CrN晶粒在100nm以下,Cr2N晶粒在100~300nm之间)。摩擦学性能测试显示,这种纳米结构复合渗铬层有降低渗层摩擦系数的趋势。

关键词(KeyWords)： 渗铬;氮化铬;表面纳米化;离子渗氮

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50671038)

作者(Author): 曹辉亮,罗承萍,刘江文,伍翠兰

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