Decarburization and improvement of ultra fine straight WC-8Co sintered via microwave sintering

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• 作者：Rui BAO^a ; Jian-hong YI^a ; ^b ; ^{yijianhong2007@sohu.com} ; Yuan-dong PENG^a ; Hao-ze ZHANG^a ; Ai-kun LI^a
• 关键词：cemented carbide ; microwave sintering ; carbon content ; mechanical properties
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：April, 2012
• 卷：22
• 期：4
• 页码：853-857
• 文件大小：381 K

摘要

Cemented tungsten carbide with ultra fine grains was prepared via microwave sintering. 畏 phase (W₃Co₃C) was formed on the surface of the samples during the preparation process. Extra carbon black was premixed and the influence of carbon content on mechanical properties was studied. The results show that the maximum value of hardness and transverse rupture strength are HRA 93.2 and 3396 MPa respectively when the carbon black content is 0.45%. The microstructure investigated by SEM show that the WC grains growth mainly occurs during the early stage of microwave sintering by the coalescence of grains.