Effect of Oxidation Pretreatment on Properties of Ultrafine Grain Cemented Carbide Material AITranslate

6又一清洁能源船型!这家船院所研发[J].船舶工程,2022,44(10).

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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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Due to the extremely fine grain size and large specific surface area of WC and Co powder, ultrafine grain cemented carbides prepared by ultrafine WC powder(d≤500 nm) is easy to be affected by the ambient oxygen while waiting for sintering after the press molding of the blank, resulting in the different oxygen content of the surface and core of the blank to form an oxygen gradient, which affects the properties of the cemented carbide material.A novel oxidation pretreatment technology, combined with the self-developed pretreatment device, was used to perform the oxidation pretreatment before the sintering of WC-9%Co ultrafine grain cemented carbide blank and then the subsequent low-pressure sintering was performed on the pretreated blank.The oxygen content of each part of the blank before and after oxidation pretreatment, and the magnetic saturation(σs),flexural strength(TRS),Rockwell hardness(HRA),fracture toughness(KIC) and coercivity(Hc) of each part of the sintered cemented carbide were compared and analyzed.The results show that the total oxygen content in the blank increases and the oxygen content is more uniformly distributed after oxidation pretreatment.After sintering, the magnetic saturation of the cemented carbide is significantly reduced and its distribution is more uniform.At the same time, properties including flexural strength and hardness are effectively improved, while the density and porosity remain unchanged.