High-temperature-resistant high-bonding-strength low infrared emissivity composite coating, metal alloy material with coating and preparation method of metal alloy material

A low-infrared emission and composite coating technology, which is applied in the coating, overlay coating, metal material coating process, etc., can solve the problems of coating performance deterioration, high equipment requirements, high cost, etc., and achieve high temperature stability Effects of improved emissivity, excellent bonding strength, and increased operating temperature
CN104818482AActive Publication Date: 2015-08-05NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2015-08-05

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Abstract

The invention discloses a high-temperature-resistant high-bonding-strength low infrared emissivity composite coating which sequentially comprises a NiCrAlY plasma spraying layer, a ZrO2 plasma spraying layer and ZrO2-Al2O3-SiO2 system containing AgPd alloy glass coating from inside to outside. The surface roughness of a metal alloy material coated with the coating is lower than 2.0 micrometers, the bonding strength of the metal alloy material exceeds 10MPa, the tolerable temperature of the coating is higher than 1000 DEG C, and the average infrared emissivity of the coating in a specified band is less than 0.3. A preparation method of the metal alloy material includes the steps: firstly, performing sand blasting for a base; secondly, sequentially spraying the NiCrAlY layer and the ZrO2 layer on the base by a plasma spraying process; finally, uniformly brushing or printing coatings on the ZrO2 layer, and drying and sintering the coatings to obtain the finished metal alloy material. The metal alloy material can be used in a high-temperature environment, infrared radiation of a high-temperature component is effectively reduced, and the metal alloy material is stable in performance and low in cost.
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Description

technical field

[0001] The invention relates to the technical field of functional coatings and composite materials thereof, in particular to a composite coating with low infrared emissivity, a metal alloy material and a preparation method thereof. Background technique

[0002] The infrared detector collects the infrared signals of the target in the bands of 3 μm to 5 μm (high temperature) and 8 μm to 14 μm (normal temperature), and then uses the difference in infrared radiation energy between the target and the background to identify the target through imaging. According to the calculation formula of infrared radiation energy difference: △W=σε 目 T 目 4 -σε 背 T 背 4 , where, ε 目 is the infrared emissivity of the target, ε 背 is the infrared emissivity of the background, T 目 is the surface temperature of the target, T 背 is the background temperature. Usually, the surface temperature of the target will be higher than that of the background due to heat generation, etc. 目...

Claims

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