J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (9): 837-843.

• Mechanical and Functional Properties of Materials • Previous Articles     Next Articles

Effect of Carbon Addition on Microstructure and Properties of WC-Co Cemented Carbides

Chongbin Wei1), Xiaoyan Song1), Jun Fu1), Xiaosen Lv2), Haibin Wang1), Yang Gao1), Shixian Zhao1),  Xuemei Liu1)   

  1. 1) College of Materials Science and Engineering, Key Lab of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China
    2) Beijing Beiying Hardalloy Co., Ltd., Beijing 100055, China
  • Online:2012-09-28 Published:2012-10-31
  • Contact: Xiaoyan Song
  • Supported by:

    the Chinese National Programs for Fundamental Research and Development (Grant No. 2011CB612207), the National Natural Science Foundation of China (Grant No. 51174009), the Program of National Science Infrastructure Platform and the State Key Laboratory of Powder Metallurgy of Central South
    University.

Abstract:

Based on a unique method to synthesize WC-Co composite powder by in-situ reactions of metal oxides and carbon, the effects of the carbon addition in the initial powders on the phase constitution, microstructure and mechanical properties of the cemented carbides were investigated. It is found that with a suitable carbon addition the pure phase constitution can be obtained in the sintered bulk from the composite powder. The mechanical properties of the cemented carbides depend on the phase constitution and the WC grain structure. To obtain the excellent properties of the WC-Co bulk, it is important to obtain the pure phase constitution from the appropriate carbon addition in the initial powders and a suitable grain size.

Key words: Cemented carbides, Carbon addition, Composite powder, Phase constitution, Mechanical property