A kind of preparation method of porous carbon heat insulation composite material

A composite material and porous carbon technology, applied in ceramic products, other household utensils, household utensils, etc., can solve the problems of low thermal conductivity of materials, large volume shrinkage, and large safety hazards, and achieve low thermal conductivity and excellent preparation process. The effect of simplicity and short production cycles

Active Publication Date: 2019-03-29
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a safe, reliable, and short process cycle preparation method for ultra-high temperature resistant porous carbon heat-insulation composite materials, to solve the problem that the preparation process of porous carbon heat-insulation composite materials is complicated, the cycle is long, and the prepared The problem of low thermal conductivity of materials
[0004] In order to overcome the shortcomings of the traditional technology such as long process cycle, large volume shrinkage in the carbonization process, and large safety hazards, the present invention proposes a new method, using the molten salt method under high ambient pressure to prepare ultra-high temperature resistant porous carbon insulation composite material

Method used

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  • A kind of preparation method of porous carbon heat insulation composite material
  • A kind of preparation method of porous carbon heat insulation composite material
  • A kind of preparation method of porous carbon heat insulation composite material

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Embodiment 1

[0044] (1) Prepare carbon fiber prefabricated parts by arranging and clamping carbon fibers: the designed carbon fiber prefabricated parts have an apparent density of 0.13g / cm 3 , according to the volume of the carbon fiber prefabricated part and the apparent density of the carbon fiber prefabricated part, the mass of the required carbon fiber is calculated by mass = density × volume. The perforated graphite fixture clamps and fixes the arranged carbon fiber to obtain a carbon fiber prefabricated part;

[0045] (2) Weighing and preparing 1-ethyl-3-methylimidazolium dicyanamide / KCl / ZnCl 2 Blends:

[0046] 2.1 Weigh the eutectic salt mixture KCl / ZnCl as the porogen of the porous carbon thermal insulation composite material 2 : Using KCl / ZnCl 2 This eutectic salt mixture consists of KCl and ZnCl 2 Two salt compositions, according to KCl and ZnCl 2 The mass ratio at the eutectic point of the binary phase diagram is 47:100 and weighed to prepare KCl / ZnCl 2 Deep eutectic salt ...

Embodiment 2～243

[0054] When preparing the eutectic salt mixture in the second step, the mass ratio of the two salts is the mass ratio of the binary phase diagram of the two salts at the eutectic point, which is determined to remain unchanged. In the third step of heating, the inert The gas provides a protective atmosphere when the ionic liquid / salt blend is heated, melted and carbonized. The use of different inert gases has no obvious effect on the performance of the composite material. In the third heating process, the heating program is determined by the ionic liquid. Different ions Liquids react violently at different temperature stages. In order to obtain high-performance carbon fiber-reinforced porous carbon insulation composites, it is necessary to slowly raise the temperature at the stage of intense reaction of ionic liquids to slow down the severity of carbonization and cracking of ionic liquids. Different ionic liquids require The temperature stage of slow heating can be obtained by d...

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Abstract

The invention discloses a preparation method of a porous carbon heat-insulating composite material and aims to solve the problem that existing porous carbon heat-insulating composite material preparation methods are long in process period, serious in volume shrinkage during carbonization and large in potential safety hazard. The preparation method includes: using ion liquid as a carbon precursor, an eutectic-salt mixture as a pore foaming agent and an inorganic carbon fiber prefabricated member as enhancosome; grinding and mixing the ion liquid and eutectic-salt mixture; increasing temperature for fusion under protection of high-pressure inert gas; mixing with the carbon fiber prefabricated member; continuing increasing temperature to enable the ion liquid to be carbonized into porous carbon to obtain a carbon fiber enhanced porous carbon / salt complex; subjecting the carbon fiber enhanced porous carbon / salt complex to cooling, water washing and drying to obtain the carbon fiber enhanced porous carbon heat-insulating composite material. The preparation method is simple in process, short in period, small in potential safety hazard and environment-friendly, and the carbon fiber enhanced porous carbon heat-insulating composite material prepared by the method is low in heat conductivity, good in heat-insulating performance, free of surface cracking and more conducive to preparing special-shaped components.

Description

technical field [0001] The invention relates to a preparation method of a heat insulation material, in particular to a preparation method of an ultrahigh temperature resistant porous carbon heat insulation composite material. Background technique [0002] With the gradual deepening of human exploration of outer space and the development of military high-tech weapons and equipment, the flight speed of new aerospace vehicles continues to increase, and the thermal environment of materials in service is becoming more and more harsh. Insulation materials. Porous carbon materials have the inherent intrinsic characteristics of carbon materials, such as ultra-high temperature resistance and radiation resistance in an inert or oxygen-free environment, and have low thermal conductivity due to their unique pore structure. A generation of ultra-high temperature-resistant high-performance thermal insulation materials are used in the thermal protection system of new aerospace vehicles. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/653C04B38/04
CPCC04B35/653C04B35/83C04B38/04C04B2235/48C04B2235/6562C04B2235/658C04B2235/77C04B2235/96C04B2235/9607C04B38/0067
Inventor 冯军宗张震冯坚姜勇刚韩佳林
Owner NAT UNIV OF DEFENSE TECH
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