Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (11): 1593-1597.DOI: 10.12068/j.issn.1005-3026.2018.11.015

• Materials & Metallurgy • Previous Articles     Next Articles

Fabrication of Ultrafine-Grained Gradient Cemented Carbide by SPS Pre-sintered Method

XU Zhi-feng1, ZHOU Xiang-kui2, WANG Kai1, WANG Qiang1   

  1. 1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; 2. Mechanical and Electrical Engineering Institute, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
  • Received:2017-07-09 Revised:2017-07-09 Online:2018-11-15 Published:2018-11-09
  • Contact: WANG Kai
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Abstract: The ultrafine-grained gradient cemented carbide (UGCC) was prepared by a two-step sintering, containing spark plasma or vacuum pre-sintering, and a gradient sintering. The effect of the pre-sintering mode (spark plasma or vacuum)on microstructure of the UGCC is studied and the influence of the pre-sintered microstructure on the gradient formation and grain growth during gradient sintering process is also analyzed. The results show that the pre-sintered microstructure of the UGCC greatly affects the gradient formation and grain growth during gradient sintering. Using this two-step sintering, the thickness of gradient layer of the UGCC can be increased to 53μm, associated with the average grain size of WC about 0.3μm.

Key words: ultrafine grain, gradient cemented carbide, SPS(spark plasma sintering) pre-sintering, gradient formation, grain size

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