Preparation of Ultrafine WC-Co Cermets by Pretreatment with Spark Plasma Sintering

Shixian Zhao; Xiaoyan Song; Mingsheng Wang; Xuemei Liu; Guozhen Zhang; Jiuxing Zhang

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Preparation of Ultrafine WC-Co Cermets by Pretreatment with Spark Plasma Sintering

Shixian Zhao #,Xiaoyan Song *,Mingsheng Wang,Xuemei Liu,Guozhen Zhang,Jiuxing Zhang

College of Materials Science and Engineering，Beijing University of Technology

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然科学基金,新世纪创新人才项目,教育部博士点基金（No.50401001, 50671001,NCET 2006,20070005010）

Opened online: 6 March 2008

Accepted by: none

Citation: Shixian Zhao,Xiaoyan Song,Mingsheng Wang.Preparation of Ultrafine WC-Co Cermets by Pretreatment with Spark Plasma Sintering[OL]. [ 6 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19100

The ultrafine WC-Co bulk materials were prepared by a new method that contains pretreatment of the milled powder mixture and subsequent spark plasma sintering (SPS). The ball milling parameters and the pretreatment temperature both have significant effects on the microstructure and properties of WC-Co cermets. The prepared cermets have the mean grain size less than 0.5um even with the pretreatment temperature as high as 1300oC. The WC-10wt.%Co cermet bulk prepared by the optimized milling, pretreatment, and SPS processing achieves the excellent mechanical properties with the hardness of 92.2HRA, the fracture toughness of 13.1 MPa.m1/2 and the transverse rapture strength of 3100MPa.

Keywords:Powder technology; Cermets; Microstructure; Sintering; Hardness

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