Nano -porous thermal insulation material substrate surface surface resistance, preparation method and matrix

Abstract

The invention provides a high temperature resistant coating on the surface of a nanoporous heat insulating material substrate, a preparation method and the substrate. The coating consists of a first heat insulating inner layer and a second heat insulating outer layer applied thereon. The layer includes inorganic oxide sol and high temperature resistant oxide. The main components of the inorganic oxide sol are consistent with the main components of the matrix. The insulating outer layer includes an inorganic oxide sol, a high emissivity component, and a metal oxide-containing silicate. The method includes: mixing the components of the first thermal insulation inner layer and coating the surface of the substrate, drying the components of the second thermal insulation outer layer, mixing and coating the components, and curing after drying. The invention can solve the problems existing in the surface coating of the current porous heat insulating material: the temperature resistance performance does not match the substrate, the high temperature sintering is required in the preparation process, the cost is high, the bonding force between the coating and the substrate is poor and easy to fall off, and the long-term high temperature cannot be used.

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 nanoporous heat insulating material substrate, 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 the spacecraft: during the flight of the aircraft, the violent friction between the fuselage and the atmosphere will generate a lot of heat, and the local maximum temperature can reach more than 1600 ° C, and the high temperature will cause serious oxidation and corrosion. One of the solutions is to adopt a thermal protection structure and add a thermal protection body to the outside, such as nanoporous thermal insulation materials, but nanoporous thermal insulation materials have poor strength due to their own structure and performance constraints. , which brings certain difficulties in practical a...

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.