Research on friction and wear properties of novel WC/Al0.5CoCrFeNiTi0.5 cemented carbide fabricated by hot pressing sintering
To suppress the grain growth of traditional WC har alloys during the sintering process and improve their service life,this study used Al0.5CoCrFeNiTi0.5 high-entropy alloy as the binder to fabricate a novel WC/Al0.5CoCrFeNiTi0.5 cemented carbide with binder contents of 17wt.％,20wt.％and 25wt.％through hot pressing sintering without adding grain growth inhibitors.WC/20wt.％Co was prepared using the same process as a control sample.The microstructure,mechanical properties,and friction and wear properties at room temperature and 800 ℃ were studied.The results show that ultrafine grain WC/Al0.5CoCrFeNiTi0.5 cemented carbide can be obtained by using Al0.5CoCrFeNiTi0.5 as binder without adding grain growth inhibitiors.WC/20wt.％Al0.5CoCrFeNiTi0.5 cemented carbide exhibits the best comprehensive mechanical properties,with a hardness of(2 389±12)HV30 and a fracture toughness of(15.95±0.5)MPa·m12,both superior to WC/20wt.％Co cemented carbide prepared by the same process.At room temperature,WC/17wt.％Al0.5CoCrFeNiTi0.5 cemented carbide shows the lowest wear rate and the best wear resistance.As the binder content increases,the wear resistance gradually decreases.The wear mechanism of WC/Al0.5CoCrFeNiTi0.5 cemented carbide at room temperature is mainly abrasive wear.Under the high temperature condition of 800 ℃,WC/20wt.％Al0.5CoCrFeNiTi0.5 cemented carbide exhibits the lowest wear rate,with wear mechanism including abrasive wear,oxidation wear and adhesive wear.Moreover,at room temperature and below 800 ℃,the wear rate of WC/Al0.5CoCrFeNiTi0.5 cemented carbide is lower than that of WC/20wt.％Co cemented carbide prepared by the same process.
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