Fabrication of 60wt%W–40wt%Cu composite with crystal orientation by combustion synthesis and melt-infiltration in ultrahigh-gravity field

Abstract

60 wt%W–40 wt%Cu composite has been prepared by combustion synthesis and melt-infiltration in ultrahigh-gravity field. The 60 wt%W–40 wt%Cu composite is unadulterated and homogeneous. The Cu phase has crystal orientation, because lateral heat dissipation was avoided and the vertical temperature gradient was much higher than the horizontal gradient which could almost be neglected. Accordingly, all the coefficient of thermal expansion, thermal diffusion coefficient and compression strength of the 60 wt%W–40 wt%Cu parallel to gravity direction are different from that perpendicular to gravity direction due to the crystal orientation of Cu. Especially, the CTE of the prepared W–40Cu was lower than that of commercial W–40Cu, which is beneficial for W–Cu composites to be used as micro-electronic materials.