表面镀铝及附着碳化硅微粒的高模碳纤维与铝的压铸复合特性

COMPOSITE CHARACTERISTICS OF ALUMINIUM REINFORCED BY THE HIGH MODULUS CARBON FIBERS COATED WITH ALUMINIUM AND SIC PARTICULATES

采用挤压铸造法直接制备了高模碳纤维、离子喷镀铝碳纤维及附着SiC微粒的碳纤维增强铝复合材料,考察了碳纤维与铝的压铸复合特性。结果表明,纯碳纤维和喷镀1μm铝层的碳纤维与铝的压铸复合持性差,而且镀铝碳纤维的铝镀层预热时发生氧化,形成氧化物界面层,但附着SiC微粒的碳纤维与铝的压铸复合特性好,纤维在铝基体中均匀分散,被铝浸润,纤维与纤维无相互接触。实验初期制备的复合材料的轴向拉伸强度为600MPa。SiC微粒的主要作用是间隔纤维,形成利于熔融铝浸透纤维的通道,使铝与纤维能较好地复合。

High-modulus type carbon fiber reinforced aluminium composite materials, in which aluminium was ion-plated on,and fine SiC particulates were distributed among the fibers, were prepared by a pressure casting process. The composite characteristics of aluminium and these fibers were investigated. The results obtained are as follows:The composite characteristics of aluminium with carbon fibers without any surface treatment or the fibers with 1μm thick Al-coated by ion-plating are poor. Satisfactory composites have not been fabricated. And on the surfaces of Al-coated fibers an oxide interfacial layer has boon formed as the result of oxi-dation of Al-coating during preheat process. The composite characteristics of aluminium and SiC particulate-distributed fibers is interestingly good,satisfactory composites have been achieved in which carbon fibers are uniformly distributed in matrix, sufficiently separated by particulates and do not contact with one another. The tensile strength of the composites prepared under non-optimum con-ditions reaches 600 MPa. SiC particulates in composite process take the role of creating fiber spacing to make molten aluminium easily and sufficiently infiltrate into carbon fibers.