Effect of boron addition on interface microstructure and thermal conductivity of Cu/diamond composites produced by high temperature-high pressure method

In order to obtain high thermal conductivity materials for efficient heat sink applications, diamond particles dispersed CuB alloy matrix composites (CuB/diamond composites) containing diamond as high as 90vol.% were produced by a high temperature-high pressure infiltration method. The thermal conductivity of the Cu-0.3wt.%B/diamond composite was measured to be 731Wm(-1)K(-1). The presence of B4C on the surface of diamond was identified by Raman scattering. The influence of B addition on interface microstructure was clarified to interpret the thermal conductivity enhancement. The results show that B addition can improve the thermal conductivity of Cu/diamond composites produced by high temperature-high pressure infiltration method.