李景才,孙斐,王树凯,杨星梅,胡静

• 1:常州大学常州市先进金属材料高技术研究重点实验室
• 2:常州轻工技术职业学院机械工程系

摘要(Abstract)：

研究了预氧化对42CrMo钢离子渗氮的催渗作用及机理。采用光学显微镜、显微硬度计、XRD、SEM和接触角测量仪研究了渗氮层厚度、渗氮层物相、预氧化后表面形貌和表面自由能。结果表明,预氧化对离子渗氮具有明显的催渗作用,在300℃预氧化30 min后进行离子渗氮(500℃、4 h),化合物层厚度达到15μm,是不经预氧化处理的传统离子渗氮化合物层厚度的2倍以上;有效扩散层厚度达到最大值570μm,明显高于传统离子渗氮的有效扩散层厚度。研究还表明,300℃预氧化30 min后表面产生了大量纳米级氧化物颗粒和微裂纹、孔洞,同时接触角最小、表面自由能最大,离子渗氮阶段氧化物可以有效地转化为氮化物。由此推测预氧化催渗机理可能是表面纳米级氧化物颗粒和微裂纹、孔洞的形成,一方面有利于活性氮原子的吸附,从而促进化合层的形成,另一方面为氮原子提供的扩散通道,有利于扩散层的增加。

关键词(KeyWords)： 42CrMo钢;预氧化;离子渗氮;表面自由能;微观结构

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51271039);; 常州市科技支撑项目(CE20110098)

作者(Author): 李景才,孙斐,王树凯,杨星梅,胡静

DOI: 10.13289/j.issn.1009-6264.2014.07.033

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