Deep regenerative restoring technique for charcoal/charcoal composite material

Abstract

The present invention provides a deep regenerative repair technology for carbon / carbon composite materials, which includes the following three parts: (1) surface treatment of C / C composite materials: first, the bonding surface is polished with corundum coarse sandpaper Smooth, and process some regular fine grooves on the bonding surface, then immerse the material in absolute ethanol and clean it with an ultrasonic cleaner for 2 hours, and finally dry it at 80°C for 4 hours; (2) High temperature adhesive Preparation: The adhesive consists of 30-35wt.% silicone resin, 30-35wt.% low melting point filler, 20-25wt.% aluminum powder, 15-20wt.% silicon powder and 0.1-0.5wt.% (3) Adhesive curing and high temperature heat treatment process: the adhesive is evenly coated on the bonding surface of the C / C composite material, and then the C / C composite material is bonded together, Finally, it is placed in a high-vacuum carbon tube furnace to be cured at 300°C for 3 hours in a vacuum environment. During the curing period, a pressure of 2.5MPa is applied to the material, and then heat-treated at a high temperature of 700°C-1200°C for 4 hours.

Description

(1) Technical field: [0001] The invention provides a carbon / carbon composite material deep regeneration repair method, which belongs to the technical field of carbon / carbon composite material. (two) background technology: [0002] Carbon / carbon (C / C) composites have excellent high-temperature mechanical properties, making them widely used in the aerospace field, but due to their complex preparation process and brittle nature, such composites are difficult to apply directly It is suitable for the manufacture of components with large dimensions or complex structures. On the other hand, the very high preparation cost of C / C composites also limits its advantages over other high-temperature structural materials. At present, although many connection technologies have been developed, there are many defects in practical applications. Techniques such as bolted connections and brazing will inevitably cause certain damage to the material itself. Therefore, the real realization of sa...

AI Technical Summary

Problems solved by technology

Among them, alumina-boria-silicon oxide can form an alumina-borosilicate bonding layer after high-temperature heat treatment, but this adhesive is physically combined with the C / C matrix, so its bonding performance not ideal

The silicon powder and metal material adhesives can directly react with the C / C matrix to form a layer of carbonized bonding transition layer, so the adhesive has strong bonding performance, but the coefficient of thermal expansion (CTE) of these carbonized materials is much larger than that of carbonized materials. The CTE of the C / C matrix makes it easy to form many cracks during thermal cycling

Images