Preparation method of C/C-Cu composite

Abstract

The invention belongs to the field of C / C-Cu composites and discloses a preparation method of a C / C-Cu composite. The method comprises the steps as follows: a C / C porous body is prepared from carbon fiber needle felt as a preform with a chemical vapor infiltration process; the C / C porous body is soaked in an anhydrous ethanol solution of phenolic resin for impregnation treatment; the C / C porous body is taken out, dried and placed in titanium dioxide sol for impregnation treatment; the C / C porous body is taken out, dried and calcined, and a C / C composite material containing a TiC coating is obtained; pure copper powder is used as an impregnant, and the temperature is kept at 1100-1300 DEG C for 0.5-2 h for copper infiltration, then the temperature is reduced to room temperature with furnacecooling, and the C / C-Cu composite is obtained. The defect of poorer wettability of copper and carbon is obviously improved, and conductive and heat-conducting performance of the composite is ensured,so that the C / C-Cu composite with excellent performance is prepared.

Description

technical field [0001] The invention belongs to the field of C / C-Cu composite materials, in particular to a preparation method of C / C-Cu composite materials. Background technique [0002] C / Cu composite material is currently a widely used sliding conductive material, which combines the excellent friction and wear properties of carbon materials and the excellent electrical conductivity of copper. However, since the two phases of Cu and C are not wetted, the interfacial bonding between the two is poor, and due to the lack of mechanical properties of graphite itself, C / Cu composites usually have problems of low density, poor electrical conductivity and mechanical properties. Therefore, C / C-Cu composites with interconnected structure have become a research hotspot in this field in recent years, and are widely used in the field of sliding electrical contacts, such as motor brushes, electric locomotive skateboards, and electrical contacts for disconnecting contact elements. [00...

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