用连续电镀法在碳纤维表面镀Cu后再镀Ni,制备了镀覆Cu-Ni双镀层的碳纤维,研究了Cu-Ni双镀层与碳纤维的高温相容性。并用镀Cu-Ni的碳纤维制备了Cu基复合材料,测试其弯曲强度、线热膨胀系数和电阻率。结果表明,Cu-Ni双镀层在高温下转变为面心立方的Cu-Ni固溶体,克服了在高温下Cu镀层的球化缩聚行为和Ni镀层对碳纤维的催化石墨化作用,且不影响碳纤维的拉伸强度。由于在界面上形成了可溶解微量碳的Cu Ni固溶体而增加了碳纤维与基体的结合强度,复合材料的弯曲强度显著增加,断口上的碳纤维拔出长度大为减小,复合材料的界面属于溶解结合型界面。
The carbon fibre electroplated continuously by a compound coating ofNi prior to Cu, the composite made of this carbon fibre together with Cu substratehave been investigated. The compatibility, between carbon fibre and duplex coatingand flexual strength, linear thermal expansion coefficient and electric resistivity ofthe composite have also been examined. Owing to the transformation of face-cen-tred-cubic Cu-Ni solid solution in the compound coating under high temperature,both the nodulizing shrinkage of Cu coating alone and the graphitization of carbonfibre accelerated by single Ni coating with a consequent loss of strength were imp-roved. Because of the dissolving of minute carbon fibre in the interfacial Cu-Ni so-lid solution, the bonding strength and flexual strength of the composite were signi-ficantly increased, and the length of carbon fibre pulled out on the fracture surfa-ce was obviously reduced. The interface of the composite seems to be of the disso-lution bonding.
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