A Novel Approach to Fabricate W-Cu Functionally Graded Materials via Sedimentation and Infiltration Method
W-Cu composites with continuously gradient distribution of components were successfully prepared by sedimentation and infiltration method. Sedimentation behavior of W particles in the suspension and the influence of PVB content on the distribution of components of W-Cu FGMs was investigated. It is concluded that when the PVB content was 4%, the components were most widely distributed in the W-Cu FGMs, and the distribution of Cu content and W content were 28.03wt%~44.47wt% and 71.97wt%~55.53wt%, respectively. The prepared W-Cu FGMs exhibits high density and thermal conductivities. When PVB content was 4%, the density, thermal conductivity, and electrical conductivity of the W-Cu FGMs are 98.23%, 285 W/(m • K) and 58.3 IACS.
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The particle size distribution of W powder was tested by the laser particle size analyzer (Malvern Panalytical, MS2000). Morphology of the green W deposit bodies, the W skeletons, and the prepared W-Cu FGMs were observed by a scanning electron microscope (FE-SEM, Hitachi SU8020), Cu content in different regions in the W-Cu FGMs was investigated by energy-dispersive X-ray spectroscopy (EDS) equipped on FE-SEM. Thermal conductivity of the W-Cu FGM samples was measured by LFA457 thermal conductivity tester (Netzsch, Germany), and density of the sintered W-Cu FGM specimens was tested by the Archimedes’ method. Hardness of the W-Cu FGMs was measured using the Vickers hardness tester (HV120, Jinan Liangong Testing Technology Co., Ltd). Each hardness value was the average of five measurements.