Research Progress of Sintering Technique of Ultrafine and Nano WC-Co Cemented Carbides
LI Meng1,2, GONG Manfeng1, ZHANG Chengyu2, MO Deyun1, LI Mei2, HAN Dong2, ZHANG Hongjun1
1 School of Mechanical and Electrical Engineering, Lingnan Normal University, Zhanjiang 524048, China 2 Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, China
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.
作者简介: 李萌,2017年6月毕业于太原科技大学,获得工学硕士学位。现为西北工业大学材料学院博士研究生。在张程煜教授与弓满锋教授的指导下开展研究。目前主要研究领域为WC-Co硬质合金制备及其性能。 弓满锋,博士(后),岭南师范学院机电工程学院教授,1973年3月生,陕西省宝鸡市人,硕士研究生导师。1996年本科毕业于四川大学,2002年硕士毕业于大连理工大学,2009年博士毕业于西北工业大学,2015年博士后出站于广东工业大学。主要从事硬质合金刀具制备及其性能表征、硬质涂层制备及性能表征、高性能功能陶瓷制备及性能表征,有限元分析及结构优化以及陶瓷机械加工工艺设备开发研究。近年来先后在Journal of Refractory Metals & Hard Materials、Surface Engineering、Journal of Ceramic Process Rearsch、《机械工程学报》《材料科学与工艺》等刊物上发表学术论文60余篇,SCI/EI收录30余篇。
引用本文:
李萌, 弓满锋, 张程煜, 莫德云, 李玫, 韩栋, 张洪军. 超细、纳米晶WC-Co硬质合金烧结技术的研究现状[J]. 材料导报, 2020, 34(15): 15138-15144.
LI Meng, GONG Manfeng, ZHANG Chengyu, MO Deyun, LI Mei, HAN Dong, ZHANG Hongjun. Research Progress of Sintering Technique of Ultrafine and Nano WC-Co Cemented Carbides. Materials Reports, 2020, 34(15): 15138-15144.
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2020, Vol. 34 
