Fabrication and Properties of In Situ B13P2 Reinforced Cu-Based Composites

In this work, a new type of B13P2 reinforced Cu matrix composite (B13P2/Cu) with excellent wear resistance properties has been fabricated. The experimental results reveal that when the total content of P and B was 3wt.% and the mass ratio of P to B was 2:3, the brittle reticular divorced eutectic Cu3P disappeared and B13P2 phase uniformly distributed in Cu matrix. The microstructure can be controlled and designed according to the ratio of P and B. The microhardness of B13P2 reached up to 1837 HV, which was as high as that of SiC, while the mircohardness of Cu matrix was about 5 times more than pure that of Cu. The wear resistance data indicate that the largest weight loss of pure Cu was approximately four times more than that of the B13P2 reinforced composites at the 40 min. The CTE of the new composites also decreased as compared with pure Cu.