Influences of ball-milled time on properties and microstructure of ultrafine WC-10Co cemented carbide

摘要

WC-lOCo nanocomposite powders prepared by spray pyrogenation-continuous reduction and carbiirization technology were consolidated by vacuum sintering plus hot isostatic pressing (HIP). Influences of ball-milled time on properties and microstructure of ultrafine WC-lOCo cemented carbide were investigated. The results show that ultrafine WC-lOCo cemented carbides can reach 99.79% relative density, and transverse rupture strength is more than 3750MPa, Rockwell A hardness is more than 92.6, the average grain size is less than 440 nm, when ball-milled time is 48 hours, ultrafine WC-lOCo cemented carbide with excellent properties and fine microstructure is obtained. The optimum ball-milling time is 48 hours.