摘要
以Fe-Ni-Cr-Ti-C粉末为原料,采用等离子束原位冶金技术在低碳钢表面合成颗粒柱体混杂增强TiC-M_7C_3/Fe复合涂层。利用光学显微镜、扫描电镜、电子能谱、X射线衍射仪、同步热分析仪及热力学计算,分析T C与M_7C_3混杂生长特征,考察干滑动摩擦条件下粒柱混杂结构的摩擦学特性。结果表明:原位合成时初生相TiC可作为次生相M_7C_3的形核基底促进M_7C_3形核;Ti C-M_7C_3粒柱混杂与单一M_7C_3增强相比耐磨性提高了31.5%;其干滑动摩擦温升与滑动距离之间符合指数渐近稳定关系y=a-b×cx;混杂增强时,M_7C_3磨损面裂纹率和脆性剥落坑增加,涂层的干滑动磨损机理主要为磨粒磨损和氧化磨损。
The TiC-M7C3 hybrid reinforced Fe-based coating was fabricated by in-situ reaction method on low carbon steel plate by plasma in-situ metallurgy process with Fe-Ni-Cr-Ti-C powders. Microstructure and hybrid growth character of TiC-M7C3 in the coating were analyzed by OM, SEM, XRD, EDS, simultaneous DSC-TGA, and thermodynamic analysis. Dry sliding wear behavior of TiC-M7C3/Fe coating was tested and compared with single rod carbide M7C3 reinforced Fe-based coating M7C3/Fe. The results show that the primary phase TiC can effectively act as the substrate for the nucleation of M7C3, thus can promote the formation of M7C3 in the TiC-M7C3/Fe coating. The dry sliding wear resistance, frictional temperature, surface crack rate and brittle peeling pit of M7C3 rod of coating TiC-M7C3/Fe are higher than that of M7C3/Fe. The relationship between temperature and sliding distance fits the exponential asymptotic stability model y=a-b×cx. The main dry sliding wear mechanism of coating TiC-M7C3/Fe are abrasive wear and oxidation wear.
作者
袁有录
张屹
李铸国
YUAN You-lu;ZHANG Yi;LI Zhu-guo(Hubei Key Laboratory of Hydroelectric Machinery Design ＆ Maintenance, College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China;School of Mechanical Engineering, Changzhou University, Changzhou 213164, China;Shanghai key Laboratory of Materials Laser Processing and Modification, School of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2017年第10期2062-2071,共10页
The Chinese Journal of Nonferrous Metals
基金
水电机械设备设计与维护湖北省重点实验室(三峡大学)(2016KJX05)
三峡大学博士科研基金(20161212)~~
