期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 42, 期 -, 页码 193-199出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2013.09.005
关键词
Spark plasma sintering; W/Cu functionally grade materials; Microstructure; Hardness; Thermal conductivity
资金
- National High Technology Research and Development Program (863 Program) of China [2013AA051402]
Three-layered (W-25Cu/W-50Cu/W-75Cu, volume fraction) W/Cu functionally graded material (FGM) was synthesized by spark plasma sintering (SPS) at different temperatures for 5 mm under a load of 40 MPa. The influences of different sintering processes on relative density, hardness, thermal conductivity and microstructure at various layers of sintered samples were investigated. The experimental results indicated that the graded structure of the composite could be well densified after the SPS process. The relative density increased with the increment of sintering temperature and it was up to 96.53% as sintered at 1050 degrees C. In addition, the thermal conductivity reached 140 W/m.K at room temperature and 151 W/m.K at 800 degrees C, which could be ascribed to the specific structure that W particles enwrapped by net-like Cu. And the Vickers hardness was converted from 4.11 to 4.68 GPa. (C) 2013 Elsevier Ltd. All rights reserved.
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