Preparation method for composite ceramic coat

Abstract

The invention relates to a preparation method for a composite ceramic coat, and belongs to the technical field of special functional ceramics. The preparation method comprises the following steps: (1) preparing lithium carbonate, aluminum nitrate, rare earth oxide and water in proportion and dissolving the lithium carbonate, the aluminum nitrate and the rare earth oxide in the water to obtain a clear transparent solution; (2) preparing ethyl orthosilicate, anhydrous ethanol and distilled water in proportion to obtain a hydrolytic solution; (3) fully mixing the clear transparent solution and the hydrolytic solution, adding acid catalyst and then gelling the mixed solution at a constant temperature of between 60 and 90 DEG C; (4) putting the gel obtained after the gelling in a drying box at a temperature of between 150 and 200 DEG C for drying and then calcining the gel to obtain a composite ceramic powder body; and (5) adding the composite ceramic powder body in distilled water to prepare slurry and coating the slurry on the surface of a substrate so as to obtain the composite ceramic coat after sintering. The composite ceramic coat has ideal waterproofness and can resist rain corrosion; moreover, the coat is matched well with the substrate to obtain the effect of widening frequency band.

Description

technical field [0001] The invention relates to a method for preparing a composite ceramic coating, which belongs to the technical field of special and functional ceramics. Background technique [0002] With the development of aerospace technology, the flight Mach number of the missile is getting higher and higher, and the missile has to withstand the erosion of rain and airflow during the flight. When the missile with all-weather working ability flies in the rain, due to the high speed of the missile, the raindrops Impact on the radome causes surface erosion, which can roughen the surface of the radome in mild cases, and cause severe peeling or damage of materials in severe cases. Traditional radome coatings are basically organic materials, and it is difficult to resist rain erosion when the organic materials are ablated during high-speed flight. Therefore, it is necessary to develop high-temperature-resistant inorganic coating materials to replace organic materials. [00...

AI Technical Summary

Problems solved by technology

[0002] With the development of aerospace technology, the flight Mach number of the missile is getting higher and higher, and the missile has to withstand the erosion of rain and airflow during the flight. When the missile with all-weather working ability flies in the rain, due to the high speed of the missile, the raindrops Impact on the radome will cause surface erosion, which will make the surface of the radome rough, and cause severe peeling or damage to the material

Traditional radome coatings are basically organic materials, and it is difficult to resist rain erosion when the organic materials are ablated during high-speed flight. Therefore, it is necessary to develop high-temperature-resistant inorganic coating materials to replace organic materials.

[0003] In addition, with the improvement of missile guidance accuracy and the development of anti-radiation missiles, the missile guidance system adopts various new technologies, such as frequency agility technology, multi-mode working mode, etc. These technologies require the radome to have broadband characteristics, and the single-wall radome It has been unable to meet these requirements, and the development of high-performance broadband high-transmittance inorganic radome has become an inevitable trend in the development of radome, and in the development process of broadband inorganic radome, the development of high-performance inorganic coating matching the core layer is become a bottleneck