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A kind of ceramic composite coating and preparation method thereof

A ceramic coating and ceramic composite technology, applied in the field of ceramic coatings, can solve the problems of high thermal conductivity, reduced service life, and large thermal stress of silicon carbide ceramic coatings, and achieve excellent heat insulation performance, oxidation prevention, and high density. high effect

Active Publication Date: 2021-12-28
湖南德智新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some special fields, such as high-speed aircraft, the thermal conductivity of silicon carbide ceramic coatings is high, and aerodynamic heating causes the surface temperature of silicon carbide ceramic coatings to rise rapidly, and the thermal expansion of silicon carbide ceramic coatings causes Great thermal stress, which causes cracks and reduces service life

Method used

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  • A kind of ceramic composite coating and preparation method thereof
  • A kind of ceramic composite coating and preparation method thereof
  • A kind of ceramic composite coating and preparation method thereof

Examples

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preparation example Construction

[0036] The ceramic composite coating described in the above-mentioned embodiments can be prepared by the following steps to obtain the ceramic composite coating of the present invention, which can be prepared by the following steps:

[0037] Substrate 30 pre-cleaning treatment;

[0038] Two-dimensional transition metal carbide or carbonitride powder particles, Y 2 o 3 Mix with deionized water, grind after mixing to obtain ceramic slurry;

[0039] Spraying the ceramic slurry on the surface of the substrate 30 after the pre-cleaning treatment, forming a two-dimensional transition metal carbide or carbonitride ceramic coating 20 after spraying;

[0040] A silicon carbide ceramic coating 10 is deposited on the surface of the two-dimensional transition metal carbide or carbonitride ceramic coating 20 to obtain a ceramic composite coating.

[0041] Preferably, the two-dimensional transition metal carbide or carbonitride powder particles, Y 2 o 3 The mass percentage is 40-70%: 1...

Embodiment 1

[0071] The present invention provides a ceramic composite coating, comprising a two-dimensional transition metal carbide or carbonitride ceramic coating 20 bonded to the surface of a substrate 30, from the substrate 30 to the two-dimensional transition metal carbide or carbonitride ceramic coating The direction of extension of the layer 20 also includes the silicon carbide ceramic coating 10 . The silicon carbide ceramic coating 10 is partially embedded in the two-dimensional transition metal carbide or carbonitride ceramic coating 20 with an embedded depth of 3 μm.

[0072] The two-dimensional transition metal carbide or carbonitride ceramic coating 20 has a lamellar structure, and the distance between the lamellar layers is 100 nm.

[0073] The inside of the two-dimensional transition metal carbide or carbonitride ceramic coating 20 is distributed with holes, the average diameter of the holes is 4 μm, and the holes occupy the two-dimensional transition metal carbide or carbo...

Embodiment 2

[0089] The present invention provides a ceramic composite coating, comprising a two-dimensional transition metal carbide or carbonitride ceramic coating 20 bonded to the surface of a substrate 30, from the substrate 30 to the two-dimensional transition metal carbide or carbonitride ceramic coating The direction of extension of the layer 20 also includes the silicon carbide ceramic coating 10 . The two-dimensional transition metal carbide or carbonitride ceramic coating 20 has a lamellar structure, and the distance between the lamellar layers is 150 nm. The silicon carbide ceramic coating 10 is partially embedded in the two-dimensional transition metal carbide or carbonitride ceramic coating 20 with an embedded depth of 3 μm.

[0090] The inside of the two-dimensional transition metal carbide or carbonitride ceramic coating 20 is distributed with holes, the average diameter of the holes is 8 μm, and the holes occupy the two-dimensional transition metal carbide or carbonitride c...

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Abstract

The invention discloses a ceramic composite coating and a preparation method thereof. The ceramic composite coating of the present invention includes a two-dimensional transition metal carbide or carbonitride ceramic coating, a silicon carbide ceramic coating; the inner surface of the two-dimensional transition metal carbide or carbonitride ceramic coating is bonded to the substrate On the surface, the silicon carbide ceramic coating is bonded to the outer surface of the two-dimensional transition metal carbide or carbonitride ceramic coating. The ceramic composite coating of the present invention can be prepared by the following steps: treating the substrate, preparing ceramic slurry, forming a two-dimensional transition metal carbide or carbonitride ceramic coating, depositing a silicon carbide ceramic coating, and obtaining a ceramic composite coating. coating. In the prior art, the thermal conductivity of the traditional silicon carbide coating is 20-30W / m·K, and the thermal conductivity of the silicon carbide ceramic coating in the present invention is 0.5-2W / m·K. The silicon carbide ceramic coating in the invention has the performances of high temperature resistance, oxidation resistance and low thermal conductivity.

Description

technical field [0001] The invention belongs to the field of ceramic coatings, in particular to a ceramic composite coating and a preparation method thereof. Background technique [0002] Silicon carbide ceramic coating has excellent high temperature resistance and oxidation resistance, can withstand high temperature above 1500 ℃, and can protect the substrate from oxidation. However, in some special fields, such as high-speed aircraft, the thermal conductivity of silicon carbide ceramic coatings is high, and aerodynamic heating causes the surface temperature of silicon carbide ceramic coatings to rise rapidly. A large thermal stress will cause cracks and reduce the service life. When silicon carbide ceramic coating protects the substrate, it basically does not have the effect of heat insulation. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to provide a ceramic composite coating and its preparat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/5057C04B41/5045C04B41/4582C04B41/4543C04B41/0072C04B41/5062C04B41/522C04B41/5059C04B41/4531
Inventor 汪洋万强柴攀其他发明人请求不公开姓名
Owner 湖南德智新材料有限公司
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