Preparation and properties of graphene-reinforced W-30Cu alloy
LIU Jianle1, WANG Dezhi2, WU Zhuangzhi1, LIU Xinli1, DUAN Bohua1
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract：Using ammonium metatungstate, copper nitrate, and graphene oxide as raw materials, W-30Cu ultrafine composite powders with different graphene contents were prepared via freeze drying-calcination-reduction process. After formed by pressing, graphene-reinforced W-30Cu alloys were fabricated by sintering in hydrogen atmosphere at 1 050 ℃. The microstructure, mechanical properties, electrical and thermal conductivity of the alloys were systematically investigated. The results show that the mechanical properties, electrical conductivity, and thermal conductivity of the alloys increase first and then decrease with the rising content of graphene. When the mass fraction of graphene is 1%, the comprehensive properties of the alloy reach the optimum through load transfer, grain refinement strengthening and interface strengthening mechanisms. At this condition, the powder possesses high purity and small particle size with uniformly dispersed graphene. The relative density of the alloy is 98.6%, the hardness (HV) is 293.1, the tensile strength is 545 MPa, the electrical conductivity is 49.33 %IACS, and the thermal conductivity is 273.4 W/(m·K).
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2026, Vol. 31 
