The carbon fibre was electroplated continuously by a duplex coating of Ni prior to Cu,andthe composite made of this carbon fibre together with Cu matrix has been investigated,thecompatibility between carbon fibre and duplex coating and flexural strength,linear thermalexpansion coefficient and electric resistivity of the composite have also been examined.Owingto the transformation of face-centred cubic Cu-Ni solid solution in the duplex coating underhigh temperatures,both the nodulizing shrinkage of Cu coating alone and the graphitizationof carbon fibre accelerated by single Ni coating with a consequent loss of strength were im-proved.Because of the dissolving of minute carbon fibre in the interfacial Cu-Ni solid solu-tion,the bonding strength and flexural strength of the composite were significantly increased,and the length of carbon fibre pulled out on the fracture surface was obviously reduced.Theinterface of the composite seems to be of the dissolution bonding.
展开▼
