Abstract：W/Y2O3-Cu composite powder prepared by wet chemical method was skeleton sintered, followed by 15 wt%Cu treatment with different holding time in the range of 1150-1450 ℃, to explore the effect of different infiltration process on the microstructure and properties of W/Y2O3-Cu composite. The results show that, for the W/Y2O3-green billet with 800 MPa pressure, it has the best skeleton structure under high temperature sintering at 1550 ℃, and the W/Y2O3-Cu composite prepared by melting 15 wt%Cu at 1250 ℃ for 3 h has the most uniform structure. It has high thermal conductivity (185.4 W/m·K), bending strength (1050.0 MPa), air tightness (5.3×10-11 Pa·m3·s-1) and low thermal expansion coefficient (6.7×10-6 /℃). The performance of W/Y2O3-Cu composites is significantly better than that of commercial W-15 wt%Cu composites, which is mainly attributed to the improvement of the microstructure and properties of W-skeleton used for copper infiltration by Y2O3 doping.
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2022, Vol. 29 