High-emissivity surface toughening coating and preparation method thereof

A high-emissivity coating technology, applied in the field of heat-resistant insulation materials, can solve the problems of insufficient high-temperature oxidation resistance and erosion resistance, and achieve the effects of meeting thermal protection requirements, enhancing wettability, and moderate viscosity

Pending Publication Date: 2022-03-01
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical solution of the present invention is to use a high-emissivity coating to overcome the problems of insufficient high-temperature oxidation resistance and erosion resistance of carbon-based ceramic heat insulation materials, and to improve the heat resistance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of silica shell-coated high-emissivity powder: using atomic layer deposition technology, using aminopropyltriethoxysilane as the silicon source, water as the oxygen source, and nitrogen as the purge gas, in TaSi 2 、MoSi 2 and SiB 4 A 5nm silica shell layer was deposited on the surface of the three powders to obtain a silica shell-coated high-emissivity powder.

[0030] (2) Take by weighing 70% of the mass percentage of quartz powder and 30% of the mass percentage of boron oxide powder in a mixing tank and mix them by ball milling, then place them in a furnace at 1200°C for 4 hours, take them out and cool them rapidly to obtain a glass frit, and then Vibration crushing and grinding into powder for later use;

[0031] (3) Preparation of the inner layer coating: Weigh 50% by mass of glass powder, 2% by mass of silicon dioxide shell coated silicon tetraboride, 15% by mass of silica shell coated Molybdenum disilicide and tantalum disilicide powder coated w...

Embodiment 2

[0037] (1) Preparation of silica shell-coated high-emissivity powder: using atomic layer deposition technology, using aminopropyltriethoxysilane as the silicon source, water as the oxygen source, and nitrogen as the purge gas, in TaSi 2 、MoSi 2 and SiB 4 A 15nm silica shell layer was deposited on the surface of the three powders to obtain a silica shell-coated high emissivity powder.

[0038](2) Quartz powder of 85% by mass and boron oxide powder of 15% by mass are mixed by ball milling in a mixing tank, then placed in a furnace at 1200°C for 6 hours, taken out and quenched to obtain a glass frit. Vibration crushing and grinding into powder for later use;

[0039] (3) Preparation of the inner layer coating: take 40% by mass of glass powder, 5% of the total mass percent of the silica shell coated silicon tetraboride, 20% of the mass percent of the silica shell coating Molybdenum disilicide and tantalum disilicide powder coated with 35% silicon dioxide shell layer, take ethan...

Embodiment 3

[0045] (1) Preparation of silica shell-coated high-emissivity powder: using atomic layer deposition technology, using aminopropyltriethoxysilane as the silicon source, water as the oxygen source, and nitrogen as the purge gas, in TaSi 2 、MoSi 2 and SiB 4 A 30nm silica shell layer was deposited on the surface of the three powders to obtain a silica shell-coated high-emissivity powder.

[0046] (2) Take by weighing 90% by mass of quartz powder 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 1300°C for 6 hours, take them out and cool them rapidly to obtain a glass frit, and then Vibration crushing and grinding into powder for later use;

[0047] (3) Preparation of the inner layer coating: Weigh 45% by mass of glass powder, 3% by mass of silicon dioxide shell coated silicon tetraboride, 15% by mass of silica shell coated Molybdenum disilicide and tantalum disilicide powder coated with 37% silica shell layer, t...

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Abstract

The invention relates to a high-emissivity surface toughening coating and a preparation method thereof. The coating with the characteristics of oxidation resistance and high emissivity is prepared on the surface of a porous fibrous carbon-based thermal insulation material by combining a slurry coating method and a thermal treatment method in an inert atmosphere. According to the method, a uniform silicon dioxide shell layer is prepared on the surface of the high-emissivity powder, so that the wettability of the silicon dioxide shell layer and a glass phase is improved, the coating can form a compact coating under a relatively low-temperature inert atmosphere, and the influence of an air atmosphere coating sintering process on the mechanical property of a carbon-based thermal insulation material matrix is remarkably reduced; and the surface coating is kept to resist heat flow impact and keep the structural stability. And the silicon dioxide shell layer has no obvious influence on the emissivity of the coating. The room temperature emissivity of the coating in the wavelength range of 0.3-2.5 is larger than 0.9. The surface of the coating is free of obvious defects, and the coating still has excellent heat protection performance, oxidation resistance and thermal shock resistance at the high temperature of 1500-1800 DEG C, and has important significance for increasing the use temperature of the carbon-based thermal insulation material.

Description

technical field [0001] The invention belongs to the field of preparation of heat-insulating materials, and in particular relates to a coating capable of toughening the surface of carbon-based ceramic heat-insulating materials and having high emissivity and a preparation method thereof. Background technique [0002] Carbon-based ceramic thermal insulation materials have become one of the key research directions of thermal protection materials in the aerospace field because of their low density and excellent performance in high temperature resistance. Taking high-speed flying weapons and re-entry vehicles as examples, some of their key parts face extremely harsh aerodynamic environments during flight, and heat insulation materials are one of the key factors to ensure the service performance and life of high-speed aircraft. Although carbon-based ceramic materials have certain temperature resistance and oxidation resistance, their surfaces do not have erosion resistance. To mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/5071C04B41/5022C04B41/5035C04B41/507C04B41/4539C04B41/0072C04B41/52
Inventor 高宇智李健刘韬郭慧孔德隆张凡李文静刘圆圆张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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