Research Progress of Sintering Technique of Ultrafine and Nano WC-Co Cemented Carbides

被引：0

作者：

Li M. ^{[1
,2
]}

Gong M. ^{[1
]}

Zhang C. ^{[2
]}

Mo D. ^{[1
]}

Li M. ^{[1
,2
]}

Han D. ^{[2
]}

Zhang H. ^{[1
]}

机构：

[1] School of Mechanical and Electrical Engineering, Lingnan Normal University, Zhanjiang

[2] Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an

来源：

Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 15期

基金：

中国国家自然科学基金;

关键词：

Sintering technique; Ultrafine and nano crystal; WC-Co cemented carbides;

D O I：

10.11896/cldb.19050188

中图分类号：

学科分类号：

摘要：

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. © 2020, Materials Review Magazine. All right reserved.

引用

页码：15138 / 15144

页数：6

共 63 条

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