发动机用石墨烯表面镀Cu增强钛基复合材料的制备及力学性能
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摘要
通过微波烧结法制备石墨烯(GNPs)表面镀Cu增强钛基(Ti6Al4V)复合材料,探讨石墨烯表面镀Cu后对钛基复合材料显微组织和力学性能的影响。结果表明:石墨烯表面成功镀覆一层较均匀分布的Cu颗粒;石墨烯与基体Ti界面反应严重,容易生成粒径为2~5μm的TiC,石墨烯表面镀Cu后,界面反应产生的TiC含量更多,同时生成了Ti_2Cu相;相比于单纯外加石墨烯,石墨烯表面镀Cu后,提高了复合材料的力学性能,其相对密度、显微硬度、抗压强度分别达到95.48%、468 HV_(0.1)、1 406 MPa;室温磨损机制由基体(Ti6Al4V)的磨粒磨损转变为GNPs-Cu/Ti6Al4V复合材料的黏着磨损。
The GNPs-Cu/Ti6Al4V composites were prepared by microwave sintering. The effects of copper plated GNPs on the microstructure and mechanical properites of Ti matrix composites were investigated. The results show that a layer of uniformly distributed copper particles is successfully coated on the surface of GNPs. The interfacial reaction between graphene and Ti matrix is serious,and TiC with particle size of 2-5 μm is easily generated. After copper coating,the Ti C contents at the interface increase,and the new Ti_2Cu phase is also generated. Compared to the GNPs/Ti6Al4V composites,the mechanical properties of the GNPs-Cu/Ti6Al4V are improved. The relative density,micro-hardness and compression strength of GNPs-Cu/Ti6Al4V are up to 95.48%,468 HV0.1 and 1 406 MPa,respectively. At the same time,the wear mechanism changes from abrasive wear of Ti6Al4V matrix to adhesive wear of GNPs-Cu/Ti6Al4V composites.
The GNPs-Cu/Ti6Al4V composites were prepared by microwave sintering. The effects of copper plated GNPs on the microstructure and mechanical properites of Ti matrix composites were investigated. The results show that a layer of uniformly distributed copper particles is successfully coated on the surface of GNPs. The interfacial reaction between graphene and Ti matrix is serious,and TiC with particle size of 2-5 μm is easily generated. After copper coating,the Ti C contents at the interface increase,and the new Ti_2Cu phase is also generated. Compared to the GNPs/Ti6Al4V composites,the mechanical properties of the GNPs-Cu/Ti6Al4V are improved. The relative density,micro-hardness and compression strength of GNPs-Cu/Ti6Al4V are up to 95.48%,468 HV0.1 and 1 406 MPa,respectively. At the same time,the wear mechanism changes from abrasive wear of Ti6Al4V matrix to adhesive wear of GNPs-Cu/Ti6Al4V composites.
引文
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