Preparation method of long-fiber carbon ceramic fastener

A fastener and carbon ceramic technology, which is applied in the field of preparation of long-fiber carbon ceramic fasteners, can solve the problems of low thermal expansion coefficient, low gas source conversion rate, long preparation period, etc. Deposition rate, effect of short preparation cycle

Active Publication Date: 2018-03-13
山东道普安制动材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon / carbon piston prepared by this invention has good thermophysical properties, low thermal expansion coefficient, small friction coefficient and self-lubricating effect; however, the resin impregnation-carbonization densification process of this invention needs to be repeated many times, which is costly and takes a long time to prepare , the densification rate is slow, and the density of the prepared piston is low; and the use of resin may cause damage to the fiber due to the brittleness of the resin, and there are safety hazards and environmental pollution problems at the same time
In the prior art, C / C fasteners and other high-temperature-resistant materials that can meet the market demand are all prepared by isothermal and isobaric CVI chemical vapor infiltration method, which has low gas source conversion rate, long preparation cycle, and slow densification in the later stage.

Method used

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  • Preparation method of long-fiber carbon ceramic fastener
  • Preparation method of long-fiber carbon ceramic fastener
  • Preparation method of long-fiber carbon ceramic fastener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing long-fiber carbon-ceramic fasteners includes the steps:

[0040] (1) A layer of long-fiber weft-free cloth (length * width is 400*400mm, long fiber length is 400mm, fineness is 0.6mm), a layer of short fiber mesh (length * width is 400*400mm, short The fiber length is 65mm and the fineness is 0.6mm) alternately. The angle between adjacent long-fiber non-weft fabric layers is 90°. Each layer of short-fiber mesh is needle punched, and the final weave is The thickness is up to 30mm. Needle density is 20 needles / cm 2 , The interlayer density is 16 layers / cm, the mass content of long-fiber non-weft fabric is 85%, the mass content of short-fiber mesh is 15%, and the final weave is 0.5g / cm. 3 Three-dimensional acupuncture preform, and finally cut into figure 1 As shown, the center is a three-dimensional needle punched preform with a through hole, and the diameter of the through hole is about φ50 mm.

[0041] (2) Place the three-dimensional needle-punched pre...

Embodiment 2

[0045] A method for preparing long-fiber carbon-ceramic fasteners includes the steps:

[0046] (1) A layer of long-fiber weft-free cloth (length * width is 400*400mm, long fiber length is 400mm, fineness is 0.6mm), a layer of short fiber mesh (length * width is 400*400mm, short The fiber length is 65mm and the fineness is 0.6mm) alternately. The angle between adjacent long-fiber non-weft fabric layers is 90°. Each layer of short-fiber mesh is needle punched, and the final weave is The thickness is up to 30mm. Needle density is 25 needles / cm 2 , The density between layers is 18 layers / cm, the mass content of long-fiber latitude cloth is 75%, the mass content of short-fiber mesh is 25%, and the final weave is 0.6g / cm. 3 Three-dimensional acupuncture preform, and finally cut into figure 1 As shown, the center is a three-dimensional needle punched preform with a through hole, the diameter of the through hole is about φ50mm;

[0047] (2) Place the three-dimensional needle-punched prefo...

Embodiment 3

[0051] A method for preparing long-fiber carbon-ceramic fasteners includes the steps:

[0052] (1) A layer of long-fiber weft-free cloth (length * width is 400*400mm, long fiber length is 400mm, fineness is 0.6mm), a layer of short fiber mesh (length * width is 400*400mm, short The fiber length is 60mm and the fineness is 0.6mm) alternately. The angle between adjacent long-fiber non-weft fabric layers is 90°. Each layer of short-fiber mesh is needle punched and finally woven into The thickness is up to 30mm. Needle density is 23 needles / cm 2 , The interlayer density is 17 layers / cm, the mass content of long-fiber non-weft cloth is 80%, the mass content of short-fiber mesh is 20%, and the final weave is 0.55g / cm. 3 Three-dimensional acupuncture preform, and finally cut into figure 1 As shown, the center is a three-dimensional needle punched preform with a through hole, the diameter of the through hole is φ50mm;

[0053] (2) Place the three-dimensional needle-punched preform obtaine...

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Abstract

The invention provides a preparation method of a long-fiber carbon ceramic fastener. The method comprises the following steps: alternately laying long-fiber non-weave cloth and short-fiber mesh tire,wherein the included angle between every two adjacent layers of long-fiber non-weave cloth is 90 degrees along the fiber direction, needling for once when each layer of short-fiber mesh tire is laid,and weaving a three-dimensional needled preform; densifying the obtained preform to 1.4-1.5g / cm<3> in precursor gas by means of pressure differential chemical vapor permeation to obtain a C / C complex;then, carrying out high-temperature heat treatment in protective gas; finally, putting the product into silicon powder, and carrying out high-temperature melting silicon infiltration, and machining and molding to obtain the long-fiber carbon ceramic fastener with the density of 2.2-2.4g / cm<3>. The preparation method provided by the invention is short in preparation period, low in residual porosity, rapid in densifying amplitude, low in cost and environmentally-friendly; the prepared carbon ceramic fastener is high in strength and volume density and better in high temperature resistance and corrosion resistance.

Description

Technical field [0001] The invention relates to a method for preparing long-fiber carbon-ceramic fasteners, belonging to the field of preparation of high-temperature structural materials, friction materials and cryogenic materials. Background technique [0002] Improving the high temperature resistance, corrosion resistance and strength indicators of hot field fasteners is the only way to achieve high-temperature graphite furnaces (required temperatures of 1000 to 1400 ℃) and to cooperate with hot field products. Therefore, the development of high-temperature resistant, new ultra-high-temperature composite materials to replace high-temperature alloys and refractory metal materials has become the key and basis for the development of high-performance thermal field accessory combinations. The material of fasteners is one of the technical commanding heights of high-temperature structural materials, which can reflect the design and manufacturing capabilities of advanced high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622C04B41/85
CPCC04B35/622C04B35/83C04B41/009C04B41/5096C04B41/85C04B2235/5248C04B2235/616
Inventor 刘汝强王殿春石艳庆杜勇
Owner 山东道普安制动材料有限公司
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