Nano porous thermal insulation material matrix surface high-temperature-resistant coating and preparation method thereof, and matrix

Abstract

The invention provides a nano porous thermal insulation material matrix surface high-temperature-resistant coating and a preparation method thereof, and a matrix. The coating is composed of a first heat insulation inner layer and a second heat insulation outer layer applied to the first heat insulation inner layer, wherein the first heat insulation inner layer comprises an inorganic oxide sol anda high-temperature-resistant oxide, the main components of the inorganic oxide sol are consistent with the main components of a matrix, the absolute value of the difference value between the particlesize of the high-temperature-resistant oxide and the nano-pore diameter of the nano porous heat insulation material does not exceed 50 nm, and the second heat insulation outer layer includes an inorganic oxide sol, a high emissivity component and a metal oxide-containing silicate. The method comprises the following steps: mixing the components of the first heat insulation inner layer, coating thesurface of a substrate with the mixture, drying, mixing the components of the second heat insulation outer layer, coating the mixture with the mixture, drying, and curing. According to the invention,the problems that the temperature resistance of the existing porous thermal insulation material surface coating is not matched with the matrix, the high-temperature sintering cost is high in the preparation process, the binding force of the coating and the matrix is poor, the coating is easy to fall off, and the long-term high-temperature use cannot be realized can be solved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a high-temperature-resistant coating on the surface of a substrate of a nanoporous heat-insulating material, a preparation method and the substrate. Background technique [0002] The problem of aerodynamic heating has become an important constraint on the improvement of the Mach number of aerospace vehicles: during the flight of the aircraft, the intense friction between the fuselage and the atmosphere will generate a lot of heat, and the local maximum temperature can reach above 1600°C, and the high temperature will seriously oxidize and corrode. One of the solutions is to adopt a thermal protection structure and add a thermal protection body on the outside, such as: nanoporous insulation materials, but nanoporous insulation materials have poor strength due to their own structure and performance constraints , which brings some difficulties in practical application. In order to...

AI Technical Summary

Problems solved by technology

[0002] The problem of aerodynamic heating has become an important constraint on the improvement of the Mach number of aerospace vehicles: during the flight of the aircraft, the intense friction between the fuselage and the atmosphere will generate a lot of heat, and the local maximum temperature can reach above 1600°C, and the high temperature will seriously oxidize and corrode. One of the solutions is to adopt a thermal protection structure and add a thermal protection body on the outside, such as: nanoporous insulation materials, but nanoporous insulation materials have poor strength due to their own structure and performance constraints , which brings some difficulties in practical application

However, the coatings currently applied on the surface of porous thermal insulation materials have the following problems: the temperature resistance does not match the substrate, the high temperature sintering is required in the preparation process, the cost is high, the coating and the substrate are poorly bonded and easy to fall off, and they cannot be used at high temperatures for a long time.