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Study of Fabrication, Microstructure and Properties of Continuous Carbon Fibers Reinforced Copper Matrix Composites

Author: ZhaoXiaoHong
Tutor: CuiChunXiang
School: Hebei University of Technology
Course: Materials Science
Keywords: Continuous carbon fiber reinforced copper matrix composites Uniformity of fiber distribution Wettability Carbon fiber plating copper The vacuum melt infiltration molding High strength and high electrical conductivity Fracture characteristics
CLC: TB331
Type: Master's thesis
Year: 2002
Downloads: 477
Quote: 3
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Abstract

This selection of high-strength, high modulus continuous carbon fiber as a reinforcing phase with pure copper matrix composite, trying to get a high-strength and high electrical conductivity of continuous carbon fiber reinforced copper matrix composites (C_F / Cu). Preparation of Cu test for performance C_f / research and study of the organization and performance of composite materials and composite formation mechanism, to identify the main factors affecting the overall performance of the composite. To overcome C_f / Cu preparation process common fiber segregation problem OF prestress adopted on both ends of the carbon fiber made of carbon fiber preform, the method can effectively control the macro-uniform distribution of the molding of the liquid phase impregnation of the fibers in the matrix . And multi-point contact with the cathode, and a two-step electroless copper plating the acidic sulfate instead of the ordinary copper plating, the surface treatment of carbon fibers by thermal oxidation pretreatment to improve the wettability between the carbon fiber and the copper matrix, which can effectively to improve the current efficiency can be obtained a uniform continuous coating between the coating and the fiber is combined with the solid carbon fiber copper composite wire, eliminate discontinuity black heart and copper, and to ensure that the composite wire with copper substrate in the subsequent process of the composite between good composite performance. The vacuum melt impregnated molded the Preparation C_f / Cu source into an inert protective gas, and in the process of molding by the melt-infiltration, as compared with the ordinary liquid-impregnated molding method, and effectively improve the liquid copper preform Relative Tim charge capacity, eliminate the shortage of ordinary cast serious filled, and to avoid damage to the high pressure generated by the pressure impregnation method to cause severe damage to the fibers of the fiber properties. Vacuum state and the inert gas added not only to optimize the composite material forming the outside atmosphere, and promote wetting, but also conducive to the exclusion of melting and molding process impurity gases. Vacuum melting impregnation liquid copper to fiber preform filling effect, the casting defects substantially reduced, a large degree of fiber damage and fracture weakened to improve the overall performance of C_f / Cu. In this paper, the mathematical model of C_f / Cu composite molding process is discussed, and the main factors affecting the composite composite molding. Through observation and analysis of the microstructure of the composite distribution, the authors believe that the composite molding process can be brought up two ideal nucleation model to describe. Model: base fluids relative to internal nucleation goes on fiber growth model; model: heterogeneous nucleation along the surface of the fiber, grew up along the fiber model. Experimental determination C_f / Cu conductivity and tensile strength parallel to the direction of fiber arrangement, and C_f / Cu fracture mechanism and composite materials conductivity of the influencing factors are discussed.

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