A method for preparing a low-heat-conductivity C/C-PI composite material

A technology of C-PI and composite materials, which is applied in the field of preparation of C/C composite materials, can solve the problems of difficult batch production, high cost, solvent toxicity, etc., and achieve good heat resistance, short preparation cycle and low thermal conductivity. Effect

Inactive Publication Date: 2018-11-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing C / C composite material preparation process is relatively complicated, the cycle is long, the cost is high, and the solvent used is toxic, which cannot meet the needs of various application fields in the future. The thermal conductivity of the prepared carbon / carbon material is not ideal, and it is difficult to batch production, which has become an urgent technical problem to be solved

Method used

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  • A method for preparing a low-heat-conductivity C/C-PI composite material
  • A method for preparing a low-heat-conductivity C/C-PI composite material

Examples

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Embodiment 1

[0020] In this example, participating in figure 1 , a preparation method of low thermal conductivity C / C-PI composite material, comprising the steps of:

[0021] a. Carbonize the polyacrylonitrile pre-oxidized felt at 950°C;

[0022] b. Using propylene as a carbon source, deposit pyrolytic carbon on the polyacrylonitrile pre-oxygenated felt substrate after the treatment in step a by chemical vapor infiltration (CVI), control the deposition temperature to be 950°C, and then undergo a high temperature of 2300°C Heat treatment to obtain the C / C green body; control the density of the C / C green body to 1.1g / cm 3 ;

[0023] c. Place the C / C green body prepared in the step b in a heat-resistant mold, and control the vacuum degree to be -0.1MPa, so that the C / C green body is vacuum-impregnated with PMR-15 polyimide resin ethanol solution , control the solid content of the PMR-15 polyimide resin ethanol solution to be 38%, so that the C / C green body impregnated body is preformed;

...

Embodiment 2

[0029] This embodiment is basically the same as Embodiment 1, especially in that:

[0030] In this embodiment, a method for preparing a low thermal conductivity C / C-PI composite material comprises the following steps:

[0031] a. Carbonize the polyacrylonitrile pre-oxidized felt at 950°C;

[0032] b. Using propylene as a carbon source, deposit pyrolytic carbon on the polyacrylonitrile pre-oxygenated felt substrate after the treatment in step a by chemical vapor infiltration (CVI), control the deposition temperature to be 950°C, and then undergo a high temperature of 2300°C Heat treatment to obtain the C / C green body; control the density of the C / C green body to be 1.3g / cm 3 ;

[0033] c. Place the C / C green body prepared in the step b in a heat-resistant mold, and control the vacuum degree to be -0.1MPa, so that the C / C green body is vacuum-impregnated with PMR-15 polyimide resin ethanol solution , control the solid content of the PMR-15 polyimide resin ethanol solution to ...

Embodiment 3

[0040] This embodiment is basically the same as the previous embodiment, and the special features are:

[0041] In this embodiment, a method for preparing a low thermal conductivity C / C-PI composite material comprises the following steps:

[0042] a. Carbonize the polyacrylonitrile pre-oxidized felt at 950°C;

[0043] b. Using propylene as a carbon source, deposit pyrolytic carbon on the polyacrylonitrile pre-oxygenated felt substrate after the treatment in step a by chemical vapor infiltration (CVI), control the deposition temperature to be 950°C, and then undergo a high temperature of 2300°C Heat treatment to obtain the C / C green body; control the density of the C / C green body to 1.5g / cm 3 ;

[0044] c. Place the C / C green body prepared in the step b in a heat-resistant mold, and control the vacuum degree to be -0.1MPa, so that the C / C green body is vacuum-impregnated with PMR-15 polyimide resin ethanol solution , control the solid content of the PMR-15 polyimide resin et...

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Abstract

A method for preparing a low-heat-conductivity C / C-PI composite material is disclosed. The method includes steps of carbonizing polyacrylonitrile preoxidized felt, then depositing pyrolytic carbon (PyC) through chemical vapor infiltration (CVI) by adopting propylene as a carbon source, then performing high-temperature thermal treatment to obtain a C / C blank, then performing vacuum impregnation with a PMR-15 polyimide resin-ethanol solution, and curing and molding to obtain the composite material. Compared with C / C composite materials, the obtained C / C-PI composite material has obviously reduced heat conductivity, a preparation period is shortened, and the prepared C / C-PI composite material can be applied in the field of aircraft thermal protection structures, and other fields. The application range of the C / C composite materials in the heat-proof field is broadened and the development prospect is expected to be better. The solvent used in a preparation process of the C / C-PI composite material is ethanol so that no toxic solvent is used and the C / C-PI composite material is environmentally friendly and free of pollution.

Description

technical field [0001] The invention relates to a preparation method of a C / C composite material, in particular to a preparation method of a polyimide resin-based C / C composite material, which is applied in the technical field of composite material preparation and performance regulation of carbon fiber reinforced carbon matrix. Background technique [0002] C / C composite material is a composite material of carbon fiber reinforced carbon matrix. Since its appearance in the 1960s, due to its high specific strength and specific modulus at high temperature, good ablation resistance, friction and wear properties, etc., it has been widely used. Successfully used in military and aerospace fields such as missile nose cones of strategic nuclear weapons, nozzle diffuser sections of rocket engines, nose cones and wing leading edges of space shuttles, and aircraft brake discs. As a new type of high-temperature thermal protection structural material, the thermophysical properties of C / C ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04C04B35/83
CPCC04B35/83C08K3/04C08L79/08
Inventor 李红耿真真任慕苏杨敏俞鸣明孙晋良
Owner SHANGHAI UNIV
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