Effect of Y₂O₃ Modified Co Binder on the Microstructure and Properties of WC-10%Co Cemented Carbide 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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The Co composite powder doped with Y₂O₃ was prepared by planetary grinding,the WC-Co mixed powder containing Y₂O₃ was prepared by adding WC powder,and then WC-Co-Y₂O₃ cemented car-bide was prepared by SPS.Scanning electron microscope,energy spectrum analyzer,X-ray diffractometer,Vickers hardness tester and friction and wear testing machine were used to investigate the effects of ball milling time on the microstructure and phase composition of Co-1%Y₂O₃ composite powder,and ball mil-ling time and Y₂O₃ content on the microstructure,phase composition,density,Vickers hardness,fracture toughness and wear resistance of WC-Co-Y₂O₃ cemented carbide.The results show that the Co diffraction peak shifts towards a larger angle after adding Y₂O₃ and ball milling.As the ball milling time increases,the Co grains are disrupted and their size becomes smaller,leading to a decrease in the intensity of Co diffraction peak.The density,Vickers hardness and fracture toughness of the cemented carbide increase with the extension of ball milling time.When the ball milling time exceeds 36 h,the hardness of the cemented car-bide tends to stabilize,while the fracture toughness decreases.The density,Vickers hardness,fracture toughness and wear resistance of the cemented carbide first increase and then decrease with the increase of Y₂O₃ content.The best overall performance of the cemented carbide is obtained when the Y₂O₃ content is 1%.The addition of rare earth oxide Y₂O₃ by stepwise ball milling can strengthen the Co binder,inhibit the growth of WC grains,and enhance the mechanical properties of the cemented carbide.