Effect of Mixing Methods on Microstructure and Properties of Inhomogeneous Cemented Carbides AITranslate

3王少东,杜辉,彭湃,宣谱,王观景,陆哲宇,魏岗.连续密度跃层中第二模态内孤立波及其波致流场实验研究[J].水动力学研究与进展（A辑）,2024,39(1):66-72.

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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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Inhomogeneous cemented carbides were prepared by using pre-sintered higher Co content fine-grained pellets(WC-12%Co) and lower Co content ultra-coarse-grained mixed powder(WC-8.5%Co) as raw materials with a mass ratio of 3∶7.The effects of different mixing methods on the microstructure and properties of the cemented carbides were studied by field emission scanning electron microscope,metallographic microscope,coercive magnetometer,hardness tester,and electro-mechanical universal testing machine.The results show that the cemented carbides mixed by dry mixing and dry milling exhibit an inhomogeneous structure of coarse-grained WC surrounding aggregated fine-grained WC,while more Co pools are formed at the same time,deteriorating the properties of the cemented carbides.However,using high-strength wet milling method for mixing can reduce the probability of forming Co pools,promote the uniform distribution of Co phase and WC grains,improve the density of cemented carbides,and achieve supe-rior comprehensive mechanical properties.In addition,the activity of WC grains in the pre-sintered fine-grained pellets is significantly reduced,which mitigates the effect of ball milling activation,slows down the growth rate of fine grains,and maintains the inhomogeneous structure of the wet-milled cemented carbides.