Research Progress of Ultrafine/Nanocrystalline Binderless WC Cemented Carbides
Binderless WC cemented carbide(binderless tungsten carbide,BTC)has excellent wear resistance,corrosion resistance,polishing performance,and oxidation resistance,which are unparalleled compared with traditional cemented carbide.It has a good application prospect in erosion-resistant and high wear-resistant tools,fine tools,oil and shale gas exploitation,and other fields.One of the key problems in the preparation of ultrafine/nanocrystalline BTC is to control the growth of WC grains.In this paper,the related research results of ultrafine/nanocrystalline BTC were reviewed from the aspects of preparation technology of ultrafine/nanocrystalline WC powder,material composition design of BTC,and molding process and sintering technology.The key role of raw material WC particle size,addition of second phase compounds,and advanced molding process and sintering technology in the densification process of BTC was emphasized.The performance differences of ultrafine/nanocrystalline BTC materials under different composition systems and different sintering processes were compared.It was pointed out that the main problems in the preparation process of ultrafine/nanocrystalline BTC were densification and strengthening and toughening,which could be solved by various advanced sintering technologies and developed second phase strengthening and toughening technologies,but they have not yet achieved industrial application.Finally,it was clarified that the development trend of ultrafine/nanocrystalline BTC was to obtain finer dense sintered bodies at low temperatures and low pressures.
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NSTL
万方数据
维普
