Method for quick-speed preparing carbon/carbon composite material using heat gradient chemical gas phase infiltration

A chemical vapor infiltration and composite material technology, which is applied in the field of rapid preparation of composite materials, can solve problems such as difficult interpretation and calculation, atmospheric pressure exceeding positive pressure, danger, etc., and achieve the effects of reducing equipment investment, improving utilization rate, and saving electric energy

Inactive Publication Date: 2006-05-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, isothermal chemical vapor infiltration (Chemical vapor infiltration, CVI) is the main method for preparing C/C composites. Although this process has certain advantages, its disadvantages are that the preparation process cycle is too long and the utilization rate of raw materials is low.
[0005] (1) The reaction to form deposited carbon is carried out in a boiling liquid precursor. This process is affected by fluid mechanics, gas-liquid two-phase flow, boiling heat transfer, and complex chemical reactions. It is not only difficult to give an accurate theoretical explanation and calculation, and it is very difficult to realize and control the process parameters in actual operat

Method used

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  • Method for quick-speed preparing carbon/carbon composite material using heat gradient chemical gas phase infiltration
  • Method for quick-speed preparing carbon/carbon composite material using heat gradient chemical gas phase infiltration

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Experimental program
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Embodiment 1

[0038] Embodiment 1: according to the technical scheme of the present invention, the carbon felt produced by Lanzhou Carbon Plant is used as a prefabricated body, and the carbon felt density is 0.1g / cm 3 , is composed of short fibers in any direction. Adopt the method of the present invention to prepare the concrete steps of the disc-shaped C / C composite material of single piece as follows:

[0039] (1) Prepare the prefabricated body and cut the carbon felt to Φ100×10mm 3 size of;

[0040] (2) Prepare the graphite heating element, process the upper and lower graphite heating elements to a diameter of Φ100mm, and a thickness of 130mm and 100mm respectively, and the prepared size is Φ100×15mm 3 The disc is used as a supporting plate, and several small holes (Φ10mm) are evenly drilled on it, and 4 pieces of size Φ15×100mm are prepared 3 Graphite support rods, prepare insulation pads (ordinary alumina bricks);

[0041] (3) Put the alumina brick, the lower graphite heating elem...

Embodiment 2

[0049] Embodiment 2: According to the technical scheme of the present invention, the needle-punched one-dimensional carbon cloth prefabricated body for preparing aircraft brake discs is adopted, and the density is ~0.5g / cm 3 . Adopt the method for the present invention to prepare the concrete steps of the annular C / C composite material of single piece as follows:

[0050] (1) Prepare the prefabricated body, and cut the needle-punched one-dimensional carbon cloth into a circular size with an outer diameter of Φ140mm, an inner diameter of Φ50mm, and a height of 20mm;

[0051] (2) Prepare the graphite heating element, process the upper and lower graphite heating elements to a diameter of Φ140, the thickness is 130mm and 100mm respectively, and the prepared size is Φ140×15mm 3 The disc is used as a supporting plate, and several small holes (Φ10mm) are evenly drilled on it, and 4 pieces of size Φ15×100mm are prepared 3 Graphite support rods, prepare insulation pads (ordinary alum...

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Abstract

The invention discloses a method to quick prepare C/C composite material by heat-gradient chemical gas phase permeation, which comprises: using two upper-lower independent graphite heaters on heat-gradient chemical gas phase permeation device to realize boil and gasify the liquid predecessor and provide high-active carbon source for cracking reaction by lower heater; locating the prefabricated body and upper heater on top of predecessor liquid surface by supporting bar and hole-contain supporting board to realize heat the prefabricated body and form heat gradient along its thickness orientation by upper heater; passing long-path convection and diffusion, the gasified carbon source enters the prefabricated body to crack and generate deposition for 4~10h, and obtaining the product with density as 1.6~1.8g/cm3. This invention needs simple devices, has technical parameters easy to regulate, reduces energy greatly, and has wide application.

Description

technical field [0001] The invention relates to a rapid preparation of composite materials, in particular to a method for rapid preparation of carbon / carbon (C / C) composite materials by thermal gradient chemical vapor infiltration using liquid precursor gasification as a carbon source. Background technique [0002] Carbon / carbon (C / C) composite materials have high specific strength, high specific stiffness, high strength at high temperature, good ablation performance, friction performance and good thermal shock resistance, as well as the designability of composite materials. In the aviation field, especially as an aircraft brake material, it has broad application prospects. At present, isothermal chemical vapor infiltration (Chemical vapor infiltration, CVI) is the main method for preparing C / C composites. Although this process has certain advantages, its disadvantages are that the preparation process cycle is too long and the utilization rate of raw...

Claims

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Application Information

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IPC IPC(8): C23C8/20C23C16/26
Inventor 王继平金志浩乔冠军
Owner XI AN JIAOTONG UNIV
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