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郭圣达,鲍瑞,刘亮,杨平,易健宏,羊建高,陈颢.原位合成复合粉制备超细WC-Co硬质合金[J].稀有金属材料与工程(英文),2017,46(12):3977~3982.[Sheng-da Guo,Rui Bao,Liang Liu,Ping Yang,Jianhong Yi,Jiangao Yang and Hao Chen.Ultra-fine Grain Cemented Carbide Fabricated from WC-Co Composite Powder by In-situ Synthesis[J].Rare Metal Materials and Engineering,2017,46(12):3977~3982.]
Ultra-fine Grain Cemented Carbide Fabricated from WC-Co Composite Powder by In-situ Synthesis
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Received:September 06, 2016  Revised:October 17, 2016
DOI:
Key words: WC-Co Composite Powder  Sintering Characteristics  Short-time Ball Milling  Porosity  Mechanical Properties
Foundation item:国家自然科学基金(KKGA201251011、51464013);云南省科技厅面上项目(2015FB127);江西省科技厅科技支撑项目(20151BBE50002);江西省教育厅青年项目(GJJ150648);昆明理工大学分析测试基金(2016P20151130003);江西理工大学重点项目(NSFJ2015-K18)
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Sheng-da Guo,Rui Bao,Liang Liu,Ping Yang,Jianhong Yi,Jiangao Yang and Hao Chen  
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Abstract:
      Using ammonium metatungstate, soluble cobalt salt, soluble carbon as the raw materials, ultrafine WC-Co composite powder was synthesized by spraying conversion, calcination, in-situ reduction and carbonization route. The composite powder fabricated by the similar route, only increased a short-time ball milling process after the calcination, was more disperse. Ultrafine WC-Co cemented carbides were prepared by spark plasma sintering with this two kinds of powders. The morphology, microstructure and mechanical properties of composite powders and cemented carbides were characterized by SEM, XRD, Vickers hardness tester and so on . The results show that the composite powder fabricated via the route without short-time ball milling process is spherical and has obvious sintering characteristics. WC particles are bonded together, the sintering neck and abnormal grain growth can be observed obviously. Powder fabricated via the route with a short-time ball milling process is more disperse. The fcc-Co and hcp-Co were existed in all two kinds of powders, the grain size of WC is 0.26 μm. There are a few pores exists in the alloy prepared by the spherical composited powder. The density is lower and the WC has abnormal growth. The mechanical properties of the alloy prepared by the dispersed composite powder are better.