Synthesis of WC-Co composite powder by reduction and carbonization reactions and its densification - 文章详情页

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摘要：

Using　microscale　tungsten　oxide,　cobalt　oxide　and　carbon　black　as　the　raw　materials,　the　ultrafine　WC-Co　composite　powder　was　synthesized　by　reduction　and　carburization　reactions.　Then　the　composite　powder　was　sintered　to　prepare　the　ultrafine-grained　cemented　carbides　bulk　by　vacuum　sintering.　The　microstructure　and　phases　of　the　composite　powder　and　the　sintered　bulk　were　investigated　by　scanning　electron　microscopy　(SEM)　and　X-ray　diffraction　meter　(XRD).　The　effects　of　the　carbon　addition　in　the　raw　powders　on　the　phase　formation　in　the　composite　powder　and　on　the　phases　and　mechanical　properties　of　the　sintered　bulk　were　investigated.　The　results　show　that　the　main　phases　of　the　ultrafine　WC-Co　composite　powder　are　WC　and　Co,　there　is　a　little　η(Co3W3C)　phase　coexisting.　The　raw　powders　with　carbon　black　content　of　16.69%　is　suitable.　The　ultrafine-grained　WC-Co　bulk　material　with　pure　phases　and　a　mean　grain　size　of　470　nm　was　obtained,　which　has　the　transverse　rupture　strength　of　2464　MPa.　WC-Co　bulk　material　prepared　with　the　raw　powders　containing　carbon　black　as　16.85%　has　a　little　free　carbon　and　the　transverse　rupture　strength　is　1946　MPa.

关键词：

Carbide tools Carbon black Carbonization Cements Cobalt Materials handling equipment Mechanical properties Raw materials Scanning electron microscopy Sintered carbides Sintering Superconducting wire Tungsten Tungsten alloys Tungsten carbide X ray diffraction X ray diffraction analysis

作者机构：

[ 1 ] [Wei, Chong-Bin]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Song, Xiao-Yan]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Zhao, Shi-Xian]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Zhang, Li]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
[ 5 ] [Liu, Xue-Mei]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Liu, Wen-Bin]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

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电子邮件地址：

xysong@bjut.edu.cn

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