High-temperature oxidation-resistant thermal-insulation composite ceramic coating

A high-temperature anti-oxidation and ceramic coating technology, applied in the field of ceramic coatings, can solve the problems of high thermal conductivity, achieve high porosity, small thermal stress, and not easy to crack and fall off

Inactive Publication Date: 2015-09-30
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect of high thermal conductivity of existing ceramic coatings and provide a high-temperature anti-oxidation and heat-insulating composite ceramic coating

Method used

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  • High-temperature oxidation-resistant thermal-insulation composite ceramic coating

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Embodiment 1

[0012] A high-temperature anti-oxidation heat-insulating composite ceramic coating, which is composed of a zirconium silicate coating, is characterized in that the ceramic coating is composed of two layers, the inner layer ceramic coating has a pore structure, and the outer layer coating is dense and free of holes, and The outer coating penetrates into the inner coating, the thickness of the inner coating is 200 μm, and the thickness of the outer coating is 100 μm. The holes are spherical structures, and the holes are connected with each other. The size of the pores is 1-10 μm, and the volume ratio of the pores to the inner coating is 50%. The penetration depth of the outer coating into the interior of the inner coating is 3 μm.

Embodiment 2

[0014] A high-temperature anti-oxidation heat-insulating composite ceramic coating is composed of an alumina coating and a mullite coating, the inner layer is an alumina ceramic coating, and the outer layer is a mullite coating. The inner ceramic coating has a porous structure, the outer coating is dense and has no pores, and the outer coating penetrates into the inner coating. The thickness of the inner coating is 100 μm, and the thickness of the outer coating is 50 μm. The hole structure is irregular, and the holes communicate with each other. The size of the pores is 1-10 μm, and the volume ratio of the pores to the inner coating is 40%. The penetration depth of the outer coating into the interior of the inner coating is 2 μm.

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Abstract

The invention discloses a high-temperature oxidation-resistant thermal-insulation composite ceramic coating which is composed of one or two of silicon carbide coating, silicon nitride coating, mullite coating, alumina coating, zirconium silicate coating and Sailong coating. The invention is characterized in that the ceramic coating is composed of an inner layer and an outer layer, wherein the inner layer has a porous structure, and the outer layer is compact and free of pores and permeates into the inside of the inner layer; and the pores are communicated mutually, the size of the pores is 1-20 mu m, and the pores account for 30-60 vol% of the inner layer. The depth of the outer layer permeating into the inside of the inner layer is 1-5 mu m. The coating has the advantages of excellent high temperature resistance, excellent oxidation resistance, excellent heat insulation property and the like. The inner layer has high porosity and loose structure, and thus, has low thermal stress at high temperature and low tendency to cracking and shedding. The outer layer permeates into the interior of the inner layer to form the mechanical bonding action, so that the inner layer and outer layer are combined closely.

Description

technical field [0001] The invention relates to a ceramic coating, in particular to a high-temperature oxidation-resistant and heat-insulating composite ceramic coating. Background technique [0002] The ceramic coating has excellent high temperature and oxidation resistance properties, can withstand high temperatures above 1500°C, and can protect the substrate from oxidation. However, in some special fields, such as high-speed aircraft, due to aerodynamic heating, the surface temperature of the material rises rapidly, and the material expands when heated, causing a large internal thermal stress, which causes cracks and reduces the service life of the material. However, the general ceramic coating has a high thermal conductivity and basically does not have the effect of heat insulation. This requires the preparation of a composite ceramic coating on its surface to reduce the thermal conductivity of the coating. [0003] As we all know, the dense coating has superior oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
Inventor 陈照峰汪洋
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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