Batch Synthesis of Ultrafine WC-Co Composite Powder and Application to Thermal Spraying
The ultrafine WC-Co composite powder was rapidly synthesized by a novel technique of in situ reactions,which was originally developed in our group and at present has achieved batch production.Using the as-synthesized composite powder with pure phases and controllable particle sizes,the granulation processing was then carried out to prepare the ultrafine structured thermal spraying feedstock.The influences of the heat-treatment process on the density of the feedstock powder and the phase constitution and wear resistance of the subsequently fabricated WC-Co coatings by high velocity oxy-fuel (HVOF) were investigated.The microstructure of the thermal-sprayed coating was characterized by the EBSD technique.The results show that increasing the heating temperature and extending the heating time lead to a remarkable increase in the density and the flowability of the feedstock powder.As a result,the decarburization of the in-flight particles is effectively inhibited and the wear resistance of the coating is significantly enhanced.Moreover,the contents of the total carbon,the free carbon and the oxygen in the ultrafine-structured feedstock powder prepared by the optimized parameters are 5.45%,0.07% and 0.08%,respectively.The studies demonstrate that the developed techniques for composite powder and thermally sprayed coating have very promising applications in industries to produce ultrafine structured cemented carbides coatings with high performance.
composite powder heat-treatment thermal spraying feedstock uhrafine-structured WC-Co coating abrasive wear resistance
Wang Haibin Song Xiaoyan Liu Xuemei Fu Jun Wei Chongbin Gao Yang
College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,Beijing 100124,China
国际会议
2012 Zhuzhou International Conference on Cemented Carbides(株洲硬质合金国际学术会议)
株洲
英文
250-258
2012-09-12（万方平台首次上网日期，不代表论文的发表时间）