A thermal insulation/infrared stealth composite coating with adjustable thickness, a titanium alloy material coated with a coating on the surface, and a preparation method thereof

Abstract

The invention relates to the field of high-temperature functional ceramic coating materials, and specifically discloses a heat-insulating / infrared stealth composite coating with adjustable thickness. The composite coating is a multi-layer superimposed structure, which sequentially includes a metal bonding layer, A ceramic layer and an infrared low emissivity layer, the ceramic layer is a lanthanum phosphate-hexaaluminate composite ceramic layer, and the infrared low emissivity layer is made of Bi 2 o 3 ‑Al 2 o 3 ‑TiO 2 -Li 2 O-SiO 2 It is a low emissivity coating composed of low melting point glass as the binder phase and silver as the conductive phase. The invention also provides a titanium alloy material coated with a coating on the surface and a preparation method thereof. The heat insulation / infrared stealth composite coating in the present invention has excellent thermal shock resistance and high temperature infrared low emissivity characteristics; its thickness can be adjusted according to different practical application requirements, and the surface density and heat insulation performance of the coating can be adjusted adjust.

Description

technical field [0001] The invention belongs to the field of high-temperature functional ceramic coating materials, and in particular relates to a heat-insulating / infrared stealth composite coating with adjustable thickness, a titanium alloy material coated with a coating on the surface and a preparation method thereof. Background technique [0002] A typical thermal barrier coating system is composed of a metal bonding layer and a ceramic surface layer. The ceramic surface layer with low thermal conductivity separates the metal substrate from the high-temperature flame, provides excellent thermal insulation performance for the metal substrate, and reduces the metal surface temperature. Effectively improve its temperature resistance and high temperature performance. Coating thermal barrier coatings on the surface of titanium alloy substrates is one of the main technical means to quickly and effectively improve its high temperature resistance and oxidation resistance. At the...

AI Technical Summary

Problems solved by technology

The emissivity can be significantly reduced by depositing a noble metal film on the surface of the titanium alloy, but the cost is too expensive; and due to the thin film thickness, it is easy to fall off and not wear-resistant; the high-temperature infrared low-emissivity coating technology has simple process technology, Less impact on the shape, not limited by the shape of the workpiece, low cost and high reliability, etc.

[0003] However, direct coating of infrared low-emissivity coatings on the surface of titanium alloys also has problems such as low bonding strength and poor thermal shock resistance, which is difficult to meet the actual application requirements of long-term high-temperature thermal shock resistance.

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