摘要
以Fe-Ni-W-C粉末为原料,采用等离子束原位冶金工艺在Q235表面经原位反应制备碳化钨(WC)增强Fe基涂层。利用扫描电镜、电子能谱、X射线衍射仪分析涂层的组织结构及原位自生WC的生长特征,考察涂层的干滑动摩擦磨损性能。结果表明:涂层中原位自生的WC生长为正三棱柱结构,其长大过程为沿〈0001〉方向在(0001)晶面层状堆叠生长,柱体最大长度接近60μm,属粗晶WC;相同干滑动摩擦条件下,与没有合成WC的Fe基涂层相比,原位合成有WC涂层的耐磨性显著提高(11倍),但由于WC柱体逐渐凸出涂层表面,造成摩擦因数波动增大,使摩擦过程稳定性逐渐降低;WC涂层的磨损机理主要为磨粒磨损和氧化磨损。
The WC-reinforced Fe-based coating was fabricated successfully on Q235 plate by plasma in- situ metallurgy process with Fe-Ni-W-C powder blends. Microstructure and growth characteristic of WC were analyzed by SEM, XRD and EDS. Dry sliding wear tests were made by M-2000 tester with load of 300N, sliding speed 0. 836m/s and distance 500m. Results show that the morphology of irt-situ synthesized WC is regular trigonaI prism （RTP） which is growing along the crystal direction （0001） on the surface （0001） with multi-layered structure. The maximum length of RPT is nearly 60/μm, be-ing a type of coarse crystalIine WC. Under the same dry sliding wear condition, the wear resistance of WC-reinforced Fe-based coating is about eleven times bigger than that of the non-WC-reinforced Fe- based coating. The friction stability of WC-reinforced coating decreases as the hard phase WC gradually protruding from the coating. The main wear mechanism of WC/Fe is abrasive wear and oxidation wear.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2016年第5期47-53,共7页
Journal of Materials Engineering
关键词
原位自生
WC涂层
干滑动
摩擦磨损
irrsitu fabrication
WC coating
dry sliding
friction and wear
