Great breakthrough was achieved in SiCp/Al composite, but its TC is still relatively low for many thermal applications [3]. With the intention to further increase thermal properties, the reinforcements (carbon and diamond) with higher TC were introduced. C/metal composite is attractive because of its ease of machinability, while diamond/metal becomes a hotspot for its extremely high TC [4]. However, non-wetting characteristic and undesirable interfacial reaction make great difficulty on the fabrication process and greatly limit the improvement of thermal properties of C/metal and diamond/metal composites [5 and 6]. Thus, improving wettability and optimizing interfacial structure become challenging issues. Additionally, advanced metal matrix composites are hard to be machined into complex shape. In response to this problem, near-net shape technology was developed in our group by the combination of pressureless infiltration and powder injection molding [7 and 8]. Brazing technique is another important aspect, but little work is done especially about Cu-matrix composites.