Investigation On Sintering Mechanism And The Micro Interface Characteristics Of C/Cu Composites Manufactured By SPS

Along with the modern science and technology rapidly development, Human’s life gradually works into the age of electronics, information and intelligent. These obvious changes are inseparable from the development of material. Under the background of this era, especially the graphite copper conductive materials show the great application potential. As an advanced technology for the preparation of materials, Spark Plasma Sintering (SPS) has a serious advantage in the development and preparation of new materials, but sintering mechanism of SPS is still not fully clear at present. So the main purpose of this study is to study the combination property of the material prepared by SPS and discuss the mechanism for density.In this paper, copper graphite composite powder was prepared through the method of mechanical alloying (MA), copper-coated carbon fibers were manufactured by Electroplating Method and the copper matrix composites reinforced with short carbon fibers were prepared by SPS in the end. The interface microstructure of composites was observed, densification process and mechanism of SPS were discussed and the influence of copper-coated carbon fiber content and the sintering temperature on the physical properties, mechanical property and friction and wear properties of composites.The results show that the interface between graphite and copper is fuzzy, has no air hole or gap and combined closely. The graphite divided the copper matrix and refrained the growth of Cu particles. The combination between carbon fiber and copper is weak. There is a mutual diffusion layer in the interface area and its thickness is about 40 nm. The densification process of SPS includes three stages. The first one is the rearrangement of particles; the second one is plasma sintering stage; the third one is the finally densification stage. With the increase of copper-coated carbon fiber content, the density of composites increased slightly, the resistivity decreased gradually, the micro hardness rose first and then fell and the friction coefficient and bulk worn loss fell first and then rose. With increasing sintering temperature, the density, hardness, resistivity, friction coefficient and bulk worn loss of composites all fell first and then rose. The friction coefficient of composites increased with the rise of load.