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《The Chinese Journal of Nonferrous Metals》 2012-11
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Spray granulation of WC-Co composite powders and influencing factors of apparent density

WANG Hai-bin 1,2,SONG Xiao-yan 1,2,LIU Xue-mei 1,2,FU Jun 1,2,WEI Chong-bin 1,2,GAO Yang 1,2(1.College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China; 2.Key Laboratory of Advanced Functional Materials,Ministry of Education, Beijing University of Technology,Beijing 100124,China)  
Spray granulation was carried out using the ultrafine WC-Co composite powders with an average particle size of 300 nm as the raw material which was rapidly synthesized by the technique of in situ reactions.The standard funnel method and scanning electron microscope(SEM) were employed to measure the apparent density and characterize the morphologies and structures of the granulated powders,respectively.Moreover,the influences of the slurry composition,the drying temperature and the particle size of raw powders on the apparent density of the granulated powders were studied by combining the experimental and theoretical calculation results.The results indicate that the apparent density of the granulated powders reaches 2.31 g/cm3 as the solid content of the slurry increases up to 70%(mass fraction).But with the increase of the organic binder content,the apparent density of the granulated powders firstly increases,and then drops down.The optimum binder content and dispersant content is 2.5%(mass fraction) and 1%-2%(mass fraction),respectively.The spray drying temperature greatly influences the morphology and the apparent density of the granulated powders and the optimum value is 150 ℃.The highest density of granulated powders essentially depends on the particle size of the raw powders.
【Fund】: 国家重点基础研究发展计划前期专项课题(2011CB612207);; 中南大学粉末冶金国家重点实验室开放课题
【CateGory Index】: TB383.3
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