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Preparation method of carbon/carbon composite material

A carbon composite material and carbon fiber prefabricated technology, which is applied in the field of carbon/carbon composite material preparation, can solve problems such as difficult identification and tracking, long production cycle, and difficulty in product quality assurance

Active Publication Date: 2020-10-27
HUNAN BOYUN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, carbon / carbon composite materials generally have a long production cycle and many processes. It is difficult to control the production process during mass production, and it is difficult to guarantee product quality.
At the same time, small-sized carbon / carbon composite prefabricated bodies are difficult to prepare, high production costs, and there are problems of easy damage, difficult identification and tracking, and difficult traceability in the subsequent mass production process

Method used

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  • Preparation method of carbon/carbon composite material
  • Preparation method of carbon/carbon composite material
  • Preparation method of carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a. Prepare the carbon fiber prefabricated body, adopt the needle-punched carbon fiber overall felt structure, that is, one layer of polyacrylonitrile carbon fiber PANCF non-weft cloth and one layer of PANCF non-weft cloth thin mesh felt are laminated at intervals, and the non-weft cloth is 0° / 90° Alternate layering, continuous needle punching, prefabricated body size is 320mm×320mm / Φ inner 75mm×H130mm, the inner hole is located in the middle, and the volume density of the felt body is 0.58g / cm 3 .

[0043] b. Graphitize the carbon fiber prefabricated body to obtain a carbon fiber green body: put the carbon fiber prefabricated body into a heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa, The carbon fiber preform is graphitized and then cooled naturally with the furnace.

[0044] c. Carry out CVD densification treatment on the carbon fiber blank, pu...

Embodiment 2

[0050] a. Prepare the carbon fiber prefabricated body, adopt the needle-punched carbon fiber overall felt structure, that is, one layer of polyacrylonitrile carbon fiber PANCF non-weft cloth and one layer of PANCF non-weft cloth thin mesh felt are laminated at intervals, and the non-weft cloth is 0° / 90° Alternate layering, continuous needle punching, the size of the prefabricated body is 340mm×340mm / Φ85mm×H100mm, the inner hole is located in the middle, and the volume density of the felt body is 0.35g / cm 3 .

[0051] b. Graphitize the carbon fiber prefabricated body to obtain a carbon fiber green body: put the carbon fiber prefabricated body into a heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa, The carbon fiber preform is graphitized and then cooled naturally with the furnace.

[0052] c. Carry out CVD densification treatment on the carbon fiber green...

Embodiment 3

[0056] a. Prepare the carbon fiber prefabricated body, adopt the needle-punched carbon fiber overall felt structure, that is, one layer of polyacrylonitrile carbon fiber PANCF non-weft cloth and one layer of PANCF non-weft cloth thin mesh felt are laminated at intervals, and the non-weft cloth is 0° / 90° Alternate layering, continuous needle punching, the prefabricated body size is 420mm×420mm / Φ100mm×H85mmmm, the inner hole is located in the middle, and the bulk density of the blanket is 0.45g / cm 3 .

[0057] b. Graphitize the carbon fiber prefabricated body to obtain a carbon fiber green body: put the carbon fiber prefabricated body into a heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa, The carbon fiber preform is graphitized and then cooled naturally with the furnace.

[0058] c. Carry out CVD densification treatment on the carbon fiber green body, pu...

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Abstract

The invention provides a preparation method of a carbon / carbon composite material. The preparation method comprises the following steps of: a, preparing a carbon fiber preform; b, performing graphitization treatment on the carbon fiber preform to obtain a carbon fiber green body; c, carrying out CVD (Chemical Vapor Deposition) densification treatment on the carbon fiber green body, punching the carbon fiber green body after carrying out at least one CVD densification treatment to obtain a first intermediate, and repeatedly carrying out CVD densification treatment on the first intermediate until the density of the first intermediate reaches a first preset value to obtain a second intermediate; d, carrying out dipping curing-high-temperature heat treatment on the second intermediate until the density of the second intermediate reaches a target value, and obtaining a semi-finished product; and e, carrying out finish machining on the semi-finished product to obtain a finished product withthe target shape and size. The method is simple in process, low in production cost and high in product percent of pass, and large-batch preparation of the small-size carbon / carbon composite material can be realized.

Description

technical field [0001] The invention relates to the technical field of composite material preparation and processing, in particular to a method for preparing a carbon / carbon composite material. Background technique [0002] Carbon / carbon composite material is a carbon matrix composite material reinforced by carbon fiber and its fabric. It has low density, high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, good thermal shock resistance and stable size. It has the advantages of high resistance, and is one of the few candidate materials used above 1650 °C. The maximum theoretical temperature is as high as 2600 °C. It has good application prospects in aviation, aerospace, nuclear energy, medicine and civil fields, and can be used for rocket and missile engines. Nozzles, aircraft antennas, aircraft and rail transit brakes and other components. [0003] In the prior art, carbon / carbon composite materials generall...

Claims

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Application Information

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IPC IPC(8): C04B35/83
CPCC04B35/83C04B2235/612C04B2235/48C04B2235/77C04B2235/608C04B2235/95
Inventor 左劲旅张红波杨波唐文进江丙武
Owner HUNAN BOYUN NEW MATERIALS
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