EFFECTS OF SIZE COMBINATION AND CONTACTING STATE OF RAW POWDER PARTICLES ON SPARK PLASMA SINTERED ULTRAFINE CEMENTED CARBIDES

Acta Metall Sin

2007, Vol. 42

Issue (1): 0-112 DOI:

Research Articles

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EFFECTS OF SIZE COMBINATION AND CONTACTING STATE OF RAW POWDER PARTICLES ON SPARK PLASMA SINTERED ULTRAFINE CEMENTED CARBIDES

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;. EFFECTS OF SIZE COMBINATION AND CONTACTING STATE OF RAW POWDER PARTICLES ON SPARK PLASMA SINTERED ULTRAFINE CEMENTED CARBIDES. Acta Metall Sin, 2007, 42(1): 0-112 .

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Abstract The ultrafine WC-10Co cemented carbides were prepared by spark plasma sintering (SPS) using sub-micron WC/nano Co and sub-micron WC/micron Co with nanocrystalline structures as the raw powders in this paper. The SPS process, microstructure and properties of the sintered samples were investigated. The ultrafine cemented carbides with mean grain size of less than 200nm were prepared using the two kinds of raw powders. The sintered sample using sub-micron WC/micron Co powders as raw materials has a relative density of 98%, hardness of HRA94.5 and fracture toughness of 13.50MPa•m1/2, which indicate an very good combination of mechanical properties. While the sample sintered using the sub-micron WC/nano Co powders as raw materials has lower properties. The densification mechanisms of sintering the two kinds of WC/Co mixed powders were analyzed based on the special SPS mechanism.

Key words: spark plasma sintering WC-Co cemented carbides high energy ball-milling densification mechanism

Received: 12 April 2006

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