Method for improving bonding strength of low-emissivity coating and carbon fiber base material

Abstract

The invention relates to a method for improving the bonding strength of a low-emissivity coating and a carbon fiber base material, and solves the problem that the mechanical properties of the coating and the carbon fiber base material are reduced due to high-temperature failure of an organic resin binder on the surface of the carbon fiber base material compared with a traditional direct spraying method. By means of high-temperature pretreatment and preparation of an organic silicon resin middle layer, the binding force of the coating and the surface of the base material is increased, an obtained sample has the advantages of being resistant to high temperature, low in emissivity, high in adhesive force and the like, good infrared performance and good mechanical performance can be achieved, the adhesive force of the sample is about 5.0 + / -0.4 Mpa after the sample is subjected to high-temperature heat treatment for 30 min at the temperature of 500 DEG C, and the requirements of various fields on good binding force of the high-temperature-resistant low-emissivity coating and the polyimide carbon fiber base material are met.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for improving the bonding strength of a low-emissivity coating and a carbon fiber substrate. Background technique [0002] In the field of aerospace, in order to meet a series of requirements such as impact resistance and compression resistance, most aircraft surfaces use a large number of high-strength materials (mostly metals, alloys, and ceramics). However, these materials have a high density, so the overall weight is relatively large, and a substantial increase in weight will lead to an increase in fuel and a sharp shortening of the voyage. If lightweight and high-strength composite materials are used, the power required by the aircraft can be greatly reduced, and the range of the aircraft can also be increased. Composite materials can be compounded by a variety of materials (two or more heterogeneous, heterogeneous, heterogeneous materials)...

AI Technical Summary

Problems solved by technology

For example, in the Chinese patent "Preparation Method of Resin-based Composite Guide Vane Anti-scouring Coating" (publication number: CN110257752A) applied by China Aviation Development Beijing Aeronautical Materials Research Institute, it is disclosed that a traditional anti-scour coating The method of adding a resin-metal primer layer and a metal intermediate layer structure in the layer alleviates the problem of thermal expansion coefficient mismatch of the coating and makes it meet the requirements of long-term use at 300 ° C. The disadvantage is that the preparation process is relatively complicated. Experimental operation is more difficult

Due to the decomposition of the organic resin on the surface of the resin-based carbon fiber and the aggravation of thermal expansion mismatch, the bonding strength between the low-emissivity coating and the substrate is reduced, and the mechanical properties at high temperatures are poor, which is difficult to meet the actual needs. This difficulty restricts Practical application of organic high temperature resistant low emissivity coating on carbon fiber materials

Images