Multi-pore fiber-shaped carbon-based insulation material surface anti-oxidation high-emissivity coating and manufacturing method thereof

An anti-oxidation coating and high emissivity technology, which is applied to the device, coating, and special surface of the surface coating liquid, can solve the problems of insufficient high temperature oxidation resistance, thermal expansion coefficient mismatch, etc., to meet the requirements of brush coating and slurry spraying requirements, uniform slurry, good temperature resistance and oxidation resistance

Active Publication Date: 2020-01-07
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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  • Multi-pore fiber-shaped carbon-based insulation material surface anti-oxidation high-emissivity coating and manufacturing method thereof
  • Multi-pore fiber-shaped carbon-based insulation material surface anti-oxidation high-emissivity coating and manufacturing method thereof

Examples

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Effect test

example 1

[0036] (1) Preparation of glass powder: take 75% by mass of silicon dioxide and 25% by mass of boron oxide powder and mix them by ball milling in a mixing tank, then place them in a furnace at 1300°C for 2 hours, take them out and cool them down quickly. Obtain glass frit, then vibrate, break and grind into powder for later use;

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

[0038] (3) Preparation of the middle anti-oxidation coa...

example 2

[0044] (1) Preparation of glass powder: take 84% by mass of silicon dioxide and 16% by mass of boron oxide powder and mix them by ball milling in a mixing tank, then place them in a furnace at 1350°C for 3 hours, take them out and cool them down quickly. Obtain glass frit, then vibrate, break and grind 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, Using absolute ethanol as the solution, the mass ratio of absolute ethanol to raw materials is 1:1.4. Ball milling and mixing treatment was performed at a speed of 180 rpm for 4 hours using a star ball mill to obtain an inner layer transition layer slurry. And the slurry is evenly brushed on the surface of the carbon-based heat insulation material to form a layer of coating that penetrates into the substrate at a depth of 1.5-2mm;

[0046] (...

example 3

[0052] (1) Preparation of glass powder: take 90% by mass of silicon dioxide and 10% by mass of boron oxide powder and mix them by ball milling in a mixing tank, then place them in a furnace at 1400° C. for 4 hours, take them out and cool them quickly. Obtain glass frit, then vibrate, break and grind 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, 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 mass ratio of absolute ethanol and raw materials is 1:1.1. Ball milling and mixing treatment was performed at a speed of 200 rpm for 4 hours using a star ball mill to obtain an inner layer transition layer slurry. And the slurry is evenly brushed on the surface of the carbon-based heat insulation material to form a layer of coating that pe...

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Abstract

The invention discloses a multi-pore fiber-shaped carbon-based insulation material surface anti-oxidation high-emissivity coating and a manufacturing method thereof. The multi-pore fiber-shaped carbon-based insulation material surface anti-oxidation high-emissivity coating comprises an inner layer transition coating, a middle-layer anti-oxidation coating and a surface-layer high-emissivity coating; the inner layer transition coating comprises 35-55% of glass, 2-4% of one or two of silicon hexaboride or silicon tetra-boride and 41-63% of high-emissivity indissolvable metal silicide; the middle-layer anti-oxidation coating comprises 50-70% of glass, 2-4% of one or two of silicon hexaboride or silicon tetra-boride and 26-48% of high-emissivity indissolvable metal silicide; and the surface-layer high-emissivity coating comprises 30-40% of glass, 2-4% of one or two of silicon hexaboride or silicon tetra-boride and 56-68% of high-emissivity indissolvable metal silicide. According to the coating, interface combination force between the coating and a matrix is improved through the transition-layer connection coating and the matrix material; the problem that thermal expansion coefficients of the coating and the matrix are not compatible is alleviated; and therefore the coating can meet space or near space aerocraft surface insulation requirements.

Description

technical field [0001] The invention belongs to the field of preparation of heat-insulating materials, and in particular relates to an oxidation-resistant high-emissivity coating on the surface of a porous fibrous carbon-based heat-insulating material and a preparation method thereof. Background technique [0002] As the flight speed of aircraft continues to increase, materials that can still play a protective and heat-insulating role in extremely harsh aerodynamic environments are one of the key factors to ensure the service performance and lifespan 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 because of their low density and excellent performance of high temperature resistance. However, carbon-based materials are easily oxidized and failed in high-temperature aerobic environments, which limits their application in the field of aerospace the...

Claims

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Application Information

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Patent Type & Authority Applications(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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