超细、纳米晶WC-Co硬质合金烧结技术的研究现状

doi:10.11896/cldb.19050188

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Abstract WC-Co cemented carbides are widely used in many industries such as cutting, mining and wear-resistant parts on account of their high hardness and wear resistance. It is noticed that when the grain size of WC is less than 0.5 μm (ultrafine and nano WC-Co cemented carbides), the hardness and strength of the material are significantly improved compared with those of conventional cemented carbide, and its toughness is also improved. Therefore, grain refinement is helpful to improve the mechanical properties and the service life of the cemented carbide. For a long time, the researches on improving the properties of cemented carbides are focused on the preparation of ultrafine and nano structured cemented carbides by using ultrafine and nano powders and reasonable sintering process. However, there is an interaction between densification and grain growth during the preparation process of cemented carbides. How to achieve the coordinated control of the densification and the grain growth of cemented carbides has been a key issue for the properties improvement and the ensurance of quality stability. The mechanisms of the densification and grain growth during the sintering process of ultrafine and nano WC-Co cemented carbides are firstly introduced, and then the studies on the sintering technologies and additives are reviewed. The sintering process is introduced in two aspects: conventional sintering techniques and fast sintering techniques. The conventional sintering process mainly includes hydrogen sintering, vacuum sintering, hot isostatic pres-sing and the fast sintering techniques mainly includes microwave sintering(MS), spark plasma sintering(SPS), high frequency induction-heated sintering(HFIHS). Moreover, the differences between the above sintering processes are compared. As for the additives, the inhibiting effects of carbides of transition metals and rare-earth elements on grain growth during sintering process of cemented carbides are introduced. On this basis, the development trends on the sintering technologies of ultrafine and nano WC-Co cemented carbides are summarized.

Key words： ultrafine and nano crystal WC-Co cemented carbides sintering technique

Published: 14 July 2020

CLC number:

TG125.3

Fund:This work was financially supported by the National Natural Science Foundation of China (51705228), the Natural Science Foundation of Guangdong Province in China(2018A030307017, 2016KTSCX079, 2016KQNCX097), the Yang-Fan Innovative and Entrepreneurial Research Team Project(2014YT02C049), Science and Technology Research Projects of Zhanjiang City (2017A02021).

About author:: Meng Li received her M.E. degree in mechanical and engineering from Taiyuan University of Science and Technology in June 2017. She is currently pursuing her Ph.D. degree in the School of Materials Science and Engineering, Northwestern Polytechnical University under the supervision of Prof. Chengyu Zhang and Prof. Manfeng Gong. At present, her research has focused on the preparation and performance of WC-Co cemented carbide.
Manfeng Gong, Ph.D. (Postdoctoral), professor, School of Electrical and Mechanical Engineering in Lingnan Normal University. He was born in March 1973, the city of Baoji in Shaanxi province, the master teacher. He received his bachelor degree in Sichuan University in 1996, received his master degree in Dalian Science and Technology University in 2002, and received his Ph.D. in Northwestern Polytechnical University in 2009. After six years later, he finished his postdoctoral from Guangdong University of Technology. His research interests are the preparation and performance characterization of cemented carbide, hard coating and high performance functional ceramics, finite element analysis and structure optimization, and research of ceramics machinery processing equipment. In recent years, he successively published more than 60 academic papers in different Journals, including the Journal of Refractory Metals and Hard Materials, Surface Engineering, Journal of Ceramic Process Rearsch, Chinese Journal of Mechanical Engineering, Materials Science and Technology and so on, among them more than 30 papers were retrieved by SCI or EI databases.

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Cite this article:

LI Meng,GONG Manfeng,ZHANG Chengyu, et al. Research Progress of Sintering Technique of Ultrafine and Nano WC-Co Cemented Carbides[J]. Materials Reports, 2020, 34(15): 15138-15144.

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http://www.mater-rep.com/EN/10.11896/cldb.19050188 OR http://www.mater-rep.com/EN/Y2020/V34/I15/15138

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