Study of Microstructure, Vickers Microindentation and Microhardness Distribution of HVOF Sprayed Composite MoB/CoCr Coating
Thermal spray coatings of new MoB/CoCr cermets were developed. The mechanical behavior of HVOF-sprayed MoB/CoCr novel composite coatings was evaluated via Vickers microhardness. Microstructure of the coatings on 316L stainless steel substrates, as well as powders, were studied with optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD). X-ray microanalysis of the coatings was carried out using energy dispersive X-ray spectrometer (EDS) attached to the SEM. The distributions of microhardness values of the coatings were analyzed via Weibull statistic. Weibull analysis revealed a bimodal distribution of Vickers microhardness values. Such distribution was attributed to the presence of melted and unmelted phases in the resultant coating produced from the microstructured powder feedstock. The excellent mechanical properties of the coating are due to the MoB/CoCr powder, which results in the formation of complex ternary transition metal boride hard particles that exhibit exceptional mechanical properties.
H.P. Lv J. Wang C.S. Zhai F. Li B.D. Sun
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
国际会议
北京
英文
2007-05-14（万方平台首次上网日期，不代表论文的发表时间）