Continuous density gradient low-density porous carbon bonding composite material and preparing method thereof

A composite material and porous carbon technology, applied in the field of carbon bonding composite materials and their preparation, can solve the problems of poor anti-scour performance and poor mechanical strength, and achieve the effects of improving thermal insulation performance, optimizing performance and increasing stability

Active Publication Date: 2016-07-27
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Low-density and high-porosity carbon felt (blanket) materials have the characteristics of high temperature resistance and good heat insulation performance, but their mechanical strength is poor, and their erosion resistance is poor in high-temperature airflow environments. Low-density and high-porosity carbon felt (blanket) ) The anti-heat insulation composite materials prepared by such materials often have severe mechanical erosion phenomenon in the harsh pneumatic heating environment.

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  • Continuous density gradient low-density porous carbon bonding composite material and preparing method thereof
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preparation example Construction

[0032] A method for preparing a continuous density gradient low-density porous carbon bonded composite material, comprising the steps of:

[0033] (1) Preparation of fiber slurry and vacuum filtration molding of fiber slurry. The chopped viscose-based carbon fibers of different lengths that have been mechanically cut are prepared into multiple fiber slurries to be formed by suction filtration according to the above-mentioned raw material mass ratio range, and the fiber slurries are stirred evenly with a mechanical stirrer. Add 50 to 100 parts by mass of deionized water, and use a glass rod to drain the fiber slurry into the molding mold slowly. Fill the molding mold with the fiber slurry and let the chopped viscose-based carbon fiber settle naturally for 5-10 minutes, then turn on the vacuum pump to vacuumize, so that the vacuum degree in the molding mold is first stabilized to 0.1MPa, and then adjusted during the suction filtration process The degree of vacuum is used to cha...

Embodiment 1

[0040] A method for preparing a continuous density gradient low-density porous carbon bonded composite material, the steps are as follows:

[0041] (1) Take out 4 pieces of chopped viscose-based carbon fibers whose mechanical cutting time is 8min, 12min, 16min and 20min, and the fiber length distribution is 1.5mm~2.5mm, 900μm~1.5mm, 600μm~900μm and 300μm respectively ~600μm. Each part of chopped viscose-based carbon fiber is prepared into chopped viscose according to the ratio of 12 parts by mass of chopped viscose-based carbon fiber, 12 parts by mass of phenolic resin, 3 parts by mass of polyacrylamide (PMA), and 1000 parts by mass of deionized water. Fiber slurry for gum-based carbon fibers. Stir the fiber slurry evenly with a mechanical stirrer and then add it in order of fiber length from short to long. During the vacuum filtration molding process, the vacuum degree changes within the range of 0.08MPa to 0.1MPa.

[0042] (2) After the vacuum filtration is completed, the ...

Embodiment 2

[0045] A method for preparing a continuous density gradient low-density porous carbon bonded composite material, the steps are as follows:

[0046] (1) Take out 5 parts of chopped viscose-based carbon fibers whose beating time is 5min, 10min, 15min, 20min and 30min, and the fiber length distribution is 2mm~3mm, 1mm~2mm, 600μm~1mm, 300μm~600μm and 100μm ~300μm. Each part of chopped viscose-based carbon fiber is formulated into chopped viscose-based carbon fiber according to the ratio of 12 parts by mass of chopped viscose-based carbon fiber, 30 parts by mass of resol resin, 5 parts by mass of polyacrylamide (PMA), and 1300 parts by mass of deionized water. A slurry of viscose-based carbon fibers. Stir the fiber slurry evenly with a mechanical stirrer and then add it in order of fiber length from short to long. During the vacuum filtration molding process, the vacuum degree changes within the range of 0.06MPa to 0.1MPa.

[0047] (2) After the vacuum filtration is completed, th...

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Abstract

The invention discloses a continuous density gradient low-density porous carbon bonding composite material.The composite material is prepared from, by mass, 12 parts of chopped viscose-based carbon fiber, 7-36 parts of fiber binder and 1.5-5 parts of fiber dispersing agent.A preparing method of the composite material comprises the steps of 1, preparing fiber size and conducting vacuum filtration formation on the fiber size; 2, heating and drying wet green obtained in the step 1 till weight does not change any more, and curing a mixture obtained after drying with the gradient curing technology under the vacuum condition; 3, conducting furnace cooling on the mixture obtained in the step 2 to indoor temperature, and then carbonizing the mixture obtained in the step 2 with the gradient carbonization treatment technology.The composite material has a high temperature resisting property and a heat insulating property, has a continuous density gradient feature in the thickness direction, and has high mechanical strength, anti-scouring performance and thermal protection/insulation efficiency.

Description

technical field [0001] The invention relates to a carbon bonding composite material and a preparation method thereof. Background technique [0002] With the continuous advancement of science and technology, the requirements for the field of high temperature insulation are getting higher and higher, and the types of high temperature insulation materials are also increasing. Typical types of high-temperature insulation materials include ceramic fiber rigid insulation tiles, high-performance fiber felt (blanket) insulation materials, and ultra-polar insulation materials with nanoporous structures. Ceramic fiber rigid insulation tiles have good mechanical properties, high temperature resistance, and can maintain their shape. They are often used as external insulation materials for aerospace vehicles, such as the heat-resistant tiles used on the windward side of the US space shuttle. Ceramic fiber rigid insulation tiles and felt (blanket) insulation materials made of high-perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/83C04B35/634C04B35/636C04B35/622
CPCC04B35/622C04B35/63436C04B35/63452C04B35/63476C04B35/636C04B35/6365C04B35/66C04B35/83C04B2235/77C04B2235/9607
Inventor 冯志海柳云钊师建军王筠杨云华左小彪
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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