Lightweight carbon fiber thermal insulation material surface pore-sealing method

A technology of thermal insulation material and carbon fiber, which is applied in the field of inorganic thermal insulation materials, can solve the problems of high temperature and oxidation resistance, and achieve the effect of small impact and small overall thermal insulation performance.

Active Publication Date: 2016-09-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical solution of the present invention is to overcome the problem that the existing light carbon fiber heat insulation material is not resistant to oxidation at high temperature, and provide a method for sealing the surface of the light carbon fiber heat insulation material, so as to realize the surface densification of the light carbon fiber heat insulation material and prevent service During the process, ambient oxygen enters the interior of the material and causes oxidative damage.

Method used

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  • Lightweight carbon fiber thermal insulation material surface pore-sealing method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) With a bulk density of 0.5g / cm 3 The lightweight carbon fiber insulation material is used as the research object for surface sealing, and the surface pore size of the material is in the range of 30 μm to 110 μm. Select phenolic resin as the liquid phase carrier, use silicon carbide powder with a particle size of 45 μm as high-temperature resistant ceramic particles, and silicon powder with a particle size of 10 μm as the active component, and mix them according to the volume ratio of 5:1.5:1.5 to form a surface To densify the slurry, add an appropriate amount of ethanol to control its fluidity.

[0038] 2) Place the above-mentioned lightweight carbon fiber heat insulation material with the surface to be sealed facing down on the material pillar in the differential pressure siphon device (to prevent the material from floating, apply a heavy object on the upper surface), and then inject the surface densification slurry to make the material to be sealed. The sealing su...

Embodiment 2

[0042] 1) With a bulk density of 0.4g / cm 3 The lightweight carbon fiber insulation material is used as the research object for surface sealing, and the surface pore size of the material is in the range of 50 μm to 150 μm. Select molten sucrose as the liquid phase carrier, use tantalum silicide powder with a particle size of 80 μm as high-temperature-resistant ceramic particles, and use silicon powder with a particle size of 45 μm as the active component, and mix them according to the volume ratio of 8:1.5:2 to form a surface coating. Densified slurry.

[0043]2) Place the above-mentioned lightweight carbon fiber heat insulation material with the surface to be sealed facing down on the material pillar in the differential pressure siphon device (to prevent the material from floating, apply a heavy object on the upper surface), and then inject the surface densification slurry, so that After the surface is sealed, the slurry is submerged about 6mm. The bottom of the reverse diff...

Embodiment 3

[0047] 1) With a bulk density of 0.6g / cm 3 The lightweight carbon fiber insulation material is used as the research object for surface sealing, and the surface pore size of the material is in the range of 20 μm to 100 μm. Select molten medium-temperature asphalt as the liquid phase carrier, use zirconium boride powder with a particle size of 55 μm as high-temperature resistant ceramic particles, and use silicon powder with a particle size of 15 μm as the active component, and mix according to the volume ratio of 10:2.5:2 A surfaced densified slurry is formed.

[0048] 2) Place the above-mentioned lightweight carbon fiber heat insulation material with the surface to be sealed facing down on the material pillar in the differential pressure siphon device, and then inject surface densification slurry so that the surface to be sealed is submerged in the slurry by about 3mm. To keep the bitumen molten, the bottom of the differential pressure siphon is heated. The surface densifica...

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Abstract

The invention relates to a lightweight carbon fiber thermal insulation material surface pore-sealing method, belongs to the field of inorganic thermal insulation materials, and is mainly used for providing a preparation method of a lightweight material which can achieve thermal protection or thermal insulation in a high-temperature aerobic environment. With high-carbon-residue-rate organic liquid precursor as a carrier, with a suitable-particle-size and high-temperature-resistant ceramic particles as a filling agent and with silicon as an active component, a surface-densification slurry is formed. The densification slurry is sucked into a certain depth of the surface layer of a lightweight carbon fiber thermal insulation material by an inverse differential pressure siphon method, then micro-positive pressure sintering is performed, and a filling material is formed. A filling surface after sintering is continuously coated with the surface-densification slurry, then vacuum sintering is performed, and a surface sealing-filling layer is formed.

Description

technical field [0001] The invention relates to a method for sealing holes on the surface of a lightweight carbon fiber heat insulating material, belonging to the field of inorganic heat insulating materials. Background technique [0002] The thermal protection system of an aerospace vehicle is the key to its reliable supersonic flight. With the development of high-speed and long-range aircraft, the thermal protection system is developing towards higher temperature resistance and lightweight. Lightweight high-temperature heat-resistant materials and high-temperature Thermal insulation materials are an important direction for the development of thermal protection materials for modern aerospace vehicles. Ceramic tile porous heat insulation materials have been applied in the thermal protection system of space shuttles, but due to the low temperature resistance level of ceramic fibers, they cannot be applied to occasions higher than 1500 °C. Lightweight carbon fiber insulation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/52
CPCC04B35/52C04B41/009C04B41/5025C04B41/5057C04B41/5059C04B41/5062C04B41/87C04B41/455C04B41/4539C04B41/0072
Inventor 李同起冯志海张大海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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