Research status of preparation of ultra-coarse grained cemented carbide by different sintering methods
Ultra-coarse-grained cemented carbide is widely used in steel rolling,die stamping and rock drilling due to its excellent impact resistance and thermal fatigue resistance.This paper introduces the research status of sinter-ing technology on ultra-coarse grain cemented carbide WC grain size and grain growth at home and abroad.The results show that the addition of ultrafine WC powder can increase the average grain size of WC and promote the densification of the prepared cemented carbide.The growth of WC grains is mainly the"dissolution-precipitation"mechanism,and properly promoting the"dissolution-precipitation"of WC grains is the key to the preparation of ultra-coarse cemented carbide with excellent performance.The sintering method for preparing ultra-coarse crystal-line cemented carbide is mainly vacuum sintering and low-pressure sintering,and compared with low-pressure sin-tering,the grain size of cemented carbide WC prepared by vacuum sintering is generally larger.At present,it is not possible to obtain ultra-coarse grain cermented carbide with high hardness ande high toughness,which limits their application.Therefore,ultra-coarse low cobalt cemented carbide with high toughness ande high hardness is an important research direction for the future.
ultra-coarse grained cemented carbideWC average grain sizesintering processgrain growthbinder phase
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