A kind of preparation method of c/c-cu composite material

Abstract

The invention belongs to the field of C / C-Cu composite materials and discloses a preparation method of C / C-Cu composite materials. Using carbon fiber needle-punched felt as a prefabricated body, the C / C porous body was prepared by chemical vapor infiltration process; the C / C porous body was soaked in an anhydrous ethanol solution of phenolic resin for impregnation treatment; the C / C porous body was taken out and baked. dry, and then place it in titanium dioxide sol for impregnation treatment; take out the C / C porous body, dry it, and then calcinate it to obtain a C / C composite material with TiC coating; use pure copper powder as the impregnating agent, at a temperature of 1100~1300 ℃ for 0.5~2 h to infiltrate copper, and then cool down to room temperature with the furnace to obtain the C / C-Cu composite material. The invention significantly improves the defect of poor wettability of copper and carbon, and at the same time ensures the electrical and thermal conductivity of the composite material, thereby preparing a C / C-Cu composite material with excellent performance.

Description

Technical field[0001]The present invention belongs to the field of C / C-Cu composite, and more particularly to a method of preparing a C / C-Cu composite material.Background technique[0002]The C / CU composite is currently a widely used sliding conductive material that combines excellent carbon material excellent friction and abrasive performance and excellent electrical conductivity. However, due to the two phases of Cu, C, the two interfaces are poor, and since the lack of mechanical properties of graphite itself, there is a problem that C / Cu composites generally defective, poor conductivity and mechanical properties. Therefore, the C / C-Cu composite with interconnection tissue structure has become a research hot spot in this area in recent years, and is widely used in the field of sliding electrical contact, such as motor electric brush, electric motor vehicle slide and disconnect contact elements.[0003]At present, the key issue in the preparation of C / C-Cu composites is to...

AI Technical Summary

Problems solved by technology

Therefore, the composite material prepared by the molding method has excellent friction and wear properties, mechanical properties and electrical conductivity, but it has high requirements for equipment, and the production cycle of the mold is long and the cost is high

The composite material prepared by copper mesh modification has low density, high mechanical properties, good electrical conductivity, and good friction and wear properties, but the bonding state with the interface needs to be further improved, and the cost needs to be further reduced

Copper or copper alloy impregnation method has simple process, can realize one-time molding of complex materials, and is suitable for mass production of products, but there are also problems such as high cost and long cycle

At present, the key to infiltration is to improve the wettability between the C phase and the copper phase. Some domestic and foreign studies have added Cu6Ti or Cu and Ti alloys for infiltration, and found that an appropriate amount of addition can significantly improve the interfacial wettability between the carbon phase and the copper alloy. Moisture, but there is a problem in this method. In the final composite material, the alloying elements will exist in the Cu phase in the form of solid solution or compound, and the existence of solid solution atoms or second phases will affect the thermal conductivity and electrical conductivity of the Cu phase. Performance is adversely affected