Study on the Preparation of Ultrafine Near-Binderless Cemented Carbides by Spark Plasma Sintering AITranslate

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Chinese Library Classification Number:TG135.5[一般工业技术—材料科学与工程]

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Ultrafine near-binderless cemented carbides were fabricated by spark plasma sintering using WC and Co powders with particle size below 500 nm as raw materials,and Cr₃C₂ as a grain growth inhibitor.The effects of binder content,ball milling methods,and sintering processes on the microstructure,relative density and mechanical properties of cemented carbides were investigated using X-ray diffractometer,metallographic microscope,scanning electron microscope,Archimedes'drainage method,and Vickers hardness tester.The results indicate that the cemented carbides prepared with different binder contents and processing routes exhibit consistent phase composition,consisting of a single WC phase.As the binder content decreases,the relative density of the cemented carbides declines with increased porosity,while the hardness increases accordingly.Specifically,when the binder content is≤0.1%(mass fraction),the hardness exhibits a marked enhancement.The cemented carbide(with 0.1%Co addition)prepared by high-energy ball milling for refinement→conventional ball milling for mixing→oscillating pressure-assisted spark plasma sintering exhi-bits no microscopic pores(relative density of 99.5%)and optimal comprehensive mechanical properties(microhardness of 2582 HV₃₀ and fracture toughness of 4.8 MPa·m^1/2).