Bonding repair method for carbon fiber reinforced carbon-based composite material, used adhesive and preparation method of adhesive

Abstract

The invention discloses a bonding repair method for a carbon fiber reinforced carbon-based composite material, a used adhesive and a preparation method of the adhesive. The repair method comprises the following steps: firstly, stirring and mixing 10 to 15 weight percent of diamond powder, 12 to 15 weight percent of zinc oxide powder, 6 to 12 weight percent of copper powder, 10 to 15 weight percent of titanium powder, 32 to 37 weight percent of low-melting-point glass powder and 20 to 25 weight percent of organic silicon resin solution to complete the preparation of the adhesive; then uniformly smearing an adhesive on the surface of the bonding surface of the Cf / C composite material and bonding, then heating to 250 DEG C at a speed of 5 DEG C / h in a blast drying oven, preserving heat for 2 hours to complete the curing of the adhesive, and applying pressure to the material during the curing period to control the thickness of the adhesive layer to be 0.08-0.3 [mu] m; finally, raising the temperature to 1200 DEG C at the speed of 100 DEG C / h in the vacuum environment of-0.1 MPa, performing heat preservation for 2 hours, and completing carbonization of the adhesive. The adhesive provided by the invention has excellent room-temperature and high-temperature bonding strength and thermal shock resistance, the room-temperature heat conductivity coefficient of the bonded and repaired material is higher than 22.31 W / (m.k), and the adhesive has wide practical value and application prospect in the field of Cf / C composite materials.

Description

technical field [0001] The invention belongs to the technical field of carbon / carbon composite materials, in particular to a carbon fiber reinforced carbon base (C f / C) Composite bonding repair method. Background technique [0002] Carbon / carbon composite materials have the characteristics of low density, high heat capacity, small thermal deformation, good ablation resistance, and excellent mechanical properties at room temperature and high temperature. They are widely used in advanced braking systems, thermal protection systems, space shuttles and rocket engines, etc. High temperature parts. However due to C f / C composite materials have a long preparation period, high cost, and complicated process, so the C f It is necessary to repair and reuse the / C composite components. Traditional repair techniques (riveting, welding or mechanical connection) are easy to cause damage to the material itself, resulting in a reduction in the strength of the material, and at the same ...

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Problems solved by technology

The organic adhesive forms a carbon bonding layer or a silicon bonding layer after high-temperature heat treatment, which has high bonding strength at room temperature and low temperature, but due to its single-phase structure, there are certain limitations and low fracture toughness. Poor thermal shock resistance

Inorganic adhesives can be combined with C f / C matrix reacts to form a carbide bonding layer with high bonding strength, which has excellent temperature resistance, but the ceramic layer and C f There is a large mismatch in the thermal expansion coefficient and elastic modulus between the / C composites, which will generate residual stress during the cooling process of the preparation temperature, resulting in a decrease in the bond strength

In addition, there are few reports on the thermal conductivity of the two adhesives.

Therefore, it is difficult for existing adhesives to meet C f Adhesive Repair Requirements for / C Composites

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