VC和Mo_(2)C对微波烧结WC-Ni_(3)Al基硬质合金组织及力学性能的影响  

Effects of VC and Mo_(2)C on the Microstructure and Mechanical Properties of WC-Ni_(3)Al Cemented Carbide by Microwave Sintering

作　　者：韩旭 唐思文 卢继[1] 刘骞 邱新义[3] 杨植富[1] HAN Xu;TANG Siwen;LU Ji;LIU Qian;QIU Xinyi;YANG Zhifu(Hunan Provincial Key Laboratory of Mechanical Equipment Health Maintenance,Hunan University of Science and Technology,Xiangtan 411201,China;Engineering Research Center of Ministry of Education for Development Technology and Equipment of Deep Sea and Deep Ground Mineral Resources,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-cut Materials,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学机械设备健康维护湖南省重点实验室,湖南湘潭411201 [2]湖南科技大学深海深地矿产资源开发技术与装备教育部工程研究中心,湖南湘潭411201 [3]湖南科技大学难加工材料高效精密加工湖南省重点实验室,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2024年第2期102-108,共7页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51305134);湖南省自然科学基金资助项目(2020JJ4308);湖南省教育厅科学研究资助项目(22A0346)。

摘　　要：采用微波烧结制备添加不同含量VC, Mo_(2)C的WC-Ni_(3)Al基硬质合金,研究添加VC和Mo_(2)C对其组织和力学性能的影响.添加VC和Mo_(2)C均可以抑制WC的溶解-析出过程,从而细化WC晶粒,同时也使黏结相Ni3Al的分布变得均匀,其中VC细化晶粒的效果更明显.添加VC使WC-Ni_(3)Al基硬质合金的相对密度、弯曲强度和断裂韧性降低而硬度提高,当VC含量为0.6%时,WC-Ni_(3)Al基硬质合金的硬度最高为1 413 HV30.当Mo_(2)C含量为1.5%时,WC-Ni_(3)Al基硬质合金的相对密度、弯曲强度和硬度均有所提高但断裂韧性下降,Mo_(2)C含量继续增加时,其相对密度下降且Mo2C会发生偏聚从而降低其力学性能.Microwave sintering technology is used to prepare WC-Ni_(3)Al-based cemented carbides with different VC and Mo_(2)C additions,and the effects of adding VC and Mo_(2)C on its microstructure and mechanical properties are investigated.The addition of VC and Mo_(2)C can inhibit the dissolution-precipitation process of WC grains,thereby refining the WC grains,and at the same time make the distribution of the binder phase Ni_(3)Al uniform.It can also be found that VC has a more obvious grain refinement effect than Mo_(2)C.The addition of VC reduces the relative density,bending strength and fracture toughness of the WC-Ni_(3)Al-based cemented carbide and increases its hardness.When the VC content is 0.6%,its hardness is 1413 HV.When the Mo_(2)C content is 1.5%,the relative density,bending strength and hardness of WC-Ni_(3)Al-based cemented carbide are increased but the fracture toughness is decreased.When the Mo_(2)C content continues to increase,its mechanical properties are reduced due to the decrease of its relative density and the occurrence of Mo_(2)C segregation.

关 键 词：WC-Ni_(3)Al硬质合金 碳化物添加剂 微波烧结 力学性能 微观组织 

分 类 号：TG135.5[一般工业技术—材料科学与工程]