Effect of tungsten carbide particles on microstructure and mechanical properties of Cu alloy composite bit matrix  

作　　者：Ding-qian Dong Feng-yuan He Xin-hui Chen Hui Li Kai-hua Shi Hui-wen Xiong Xin Xiang Li Zhang 

机构地区：[1]College of Mechanical Engineering,Sichuan University of Science and Engineering,Zigong,643000,Sichuan,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,Hunan,China [3]Zigong Cemented Carbide Co.,Ltd.,Zigong,643011,Sichuan,China [4]Material Corrosion and Protection Key Laboratory of Sichuan Province,Sichuan University of Science and Engineering,Zigong,643000,Sichuan,China

出　　处：《Journal of Iron and Steel Research International》2024年第2期519-530,共12页

基　　金：supported by the National Natural Science Foundation of China(Grant No.52074365);grateful to the Sichuan Science and Technology Program,China(Grant No.2022YFG0289);sponsored by the Funding Project of Key Laboratory of Sichuan Province for comprehensive Utilization of Vanadium and Titanium Resources,China(Grant No.2018FTSZ26);the Project Supported by the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province,China(Grant Nos.2021CL26,GK202104,and GK202106);supported by the Ph.D.Programs Foundation of Sichuan University of Science and Engineering,China(Grant No.2021RC18).

摘　　要：Copper alloy composite bit matrix was prepared by pressureless vacuum infiltration,using at least one of the three kinds of tungsten carbide particles,for example,irregular cast tungsten carbide,monocrystalline tungsten carbide and sintered reduced tungsten carbide particles.The effects of powder particle morphology,particle size and mass fraction of tungsten carbide on the microstructure and mechanical properties of copper alloy composite were investigated by means of scanning electron microscopy,X-ray diffraction and abrasive wear test in detail.The results show that tungsten carbide morphology and particle size have obvious effects on the mechanical properties of copper alloy composites.Cast tungsten carbide partially dissolved in the copper alloy binding phase,and layers of Cu_(0.3)W_(0.5)Ni_(0.1)Mn_(0.1)C phase with a thickness of around 8–15μm were formed on the edge of the cast tungsten carbide.When 45%irregular crushed fine cast tungsten carbide and 15%monocrystalline cast tungsten carbide were used as the skeleton,satisfactory comprehensive performance of the reinforced copper alloy composite bit matrix was obtained,with the bending strength,impact toughness and hardness reaching 1048 MPa,4.95 J/cm^(2) and 43.6 HRC,respectively.The main wear mechanism was that the tungsten carbide particles firstly protruded from the friction surface after the copper alloy matrix was worn,and then peeled off from the matrix when further wear occurred.

关 键 词：Polycrystalline diamond compact Pressureless vacuum infiltration Copper alloy composite bit matrix Microstructure characterization Abrasive wear behavior 

分 类 号：TB33[一般工业技术—材料科学与工程]