Antioxidative high emissivity coating on the surface of porous fibrous carbon-based thermal insulation material and preparation method thereof

A technology of thermal insulation material and high emissivity, which can be used in devices, coatings, special surfaces, etc. to apply liquid to the surface. Meet the requirements of brushing and slurry spraying, and resist the effect of thermal shock

Active Publication Date: 2022-07-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the problem of insufficient high temperature oxidation resistance of porous fibrous carbon-based thermal insulation materials, to use high emissivity components to further improve the thermal insulation performance of the material, and to connect the coating and the base material through the transition layer, Improve the interface bonding force between the coating and the substrate, alleviate the problem of thermal expansion coefficient mismatch between the coating and the substrate, and provide a preparation method for the oxidation-resistant and high-emissivity coating on the surface of porous fibrous carbon-based thermal insulation materials, so that it can meet the needs of space or adjacent areas. Space vehicle surface anti-heat insulation requirements

Method used

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  • Antioxidative high emissivity coating on the surface of porous fibrous carbon-based thermal insulation material and preparation method thereof
  • Antioxidative high emissivity coating on the surface of porous fibrous carbon-based thermal insulation material and preparation method thereof

Examples

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Effect test

example 1

[0036] (1) Preparation of glass powder: weigh 75% by mass of silicon dioxide and 25% by mass of boron oxide powder, mix them by ball milling in a mixing tank, and then place them in a 1300°C furnace for 2 hours, take them out and quench them. The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;

[0037] (2) Preparation of inner layer transition coating: Weigh 35% by mass glass powder, 2% by mass silicon hexaboride powder and 41% by mass molybdenum disilicide, take absolute ethanol as a solution, anhydrous The mass ratio of ethanol and raw material is 1:1.5. A star ball mill was used for ball milling and mixing treatment at a speed of 180 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that penetrates into the substrate with a depth of 2mm;

[0038] (3) Preparation of middle-layer anti-oxidation co...

example 2

[0044] (1) Preparation of glass powder: weigh 84% by mass of silicon dioxide and 16% by mass of boron oxide powder and mix them in a mixing tank by ball milling, then place them in a 1350°C furnace for 3 hours, take them out and quench them, The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;

[0045] (2) Preparation of inner layer transition coating: weigh 55% by mass of glass powder, 4% by mass of silicon hexaboride powder, 48% by mass of molybdenum disilicide and 15% by mass of tantalum disilicide, Taking absolute ethanol as a solution, the mass ratio of absolute ethanol and raw material is 1:1.4. A star ball mill was used for ball milling and mixing treatment at a speed of 180 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that penetrates into the substrate with a depth of 1.5-2mm;

[0046] ...

example 3

[0052] (1) Preparation of glass powder: weigh 90% by mass of silicon dioxide and 10% by mass of boron oxide powder, mix them by ball milling in a mixing tank, then place them in a 1400°C furnace for 4 hours, take them out and quench them. The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;

[0053] (2) Preparation of inner layer transition coating: weigh 42% by mass of glass powder, 1% by mass of silicon hexaboride powder, 2% by mass of silicon tetraboride powder, and 20% by mass of disilicide Molybdenum and tantalum disilicide with a mass percentage of 35% are used as a solution in absolute ethanol, and the ratio of absolute ethanol to raw material mass is 1:1.1. A star ball mill was used for ball milling and mixing treatment at a speed of 200 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that ...

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Abstract

The invention discloses an anti-oxidation and high emissivity coating on the surface of a porous fibrous carbon-based heat insulating material and a preparation method thereof. The coating includes an inner layer transition coating, a middle layer anti-oxidation coating and a surface layer high emissivity coating; the inner layer transition coating includes 35-55% glass, 2-4% silicon hexaboride or silicon tetraboride one or both of and 41-63% high emissivity insoluble metal silicide; the middle layer anti-oxidation coating comprises 50-70% glass, 2-4% silicon hexaboride or silicon tetraboride One or both of 26-48% high emissivity insoluble metal silicide; the surface high emissivity coating includes: 30-40% glass, 2-4% silicon hexaboride or silicon tetraboride One or both and 56‑68% high emissivity insoluble metal silicides. The coating connects the coating and the base material through a transition layer, improves the interface bonding force between the coating and the base, and alleviates the problem of mismatching thermal expansion coefficients between the coating and the base, so that it can meet the needs of space or near space aircraft surface thermal insulation.

Description

technical field [0001] The invention belongs to the field of preparation of anti-thermal insulation materials, in particular to an anti-oxidative high emissivity coating on the surface of a porous fibrous carbon-based thermal insulation material and a preparation method thereof. Background technique [0002] As the flight speed of aircraft continues to increase, materials that can still play a role in preventing and insulating in extremely harsh aerodynamic environments are one of the key factors to ensure the service performance and life of a new generation of aircraft. At present, carbon-based thermal insulation materials have become one of the key research directions of thermal protection materials for aerospace due to their low density and excellent high temperature resistance. However, carbon-based materials are easily oxidized and fail in a high-temperature aerobic environment, which limits their application in the field of aerospace thermal protection materials. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D1/02B05D1/28B05D5/00B05D1/36B05D7/24B05D3/02
CPCB05D7/24B05D5/00B05D1/02B05D1/28B05D7/582B05D3/0254
Inventor 高宇智张凡李健李文静杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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