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A kind of preparation method of long-fiber carbon ceramic fastener

A technology for fasteners and carbon ceramics, applied in the field of preparation of long-fiber carbon ceramics fasteners, can solve the problems of low gas source conversion rate, low thermal expansion coefficient, small friction coefficient, etc., to improve deposition rate and gas source utilization The effect of high rate and low porosity

Active Publication Date: 2020-05-15
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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  • A kind of preparation method of long-fiber carbon ceramic fastener
  • A kind of preparation method of long-fiber carbon ceramic fastener
  • A kind of preparation method of long-fiber carbon ceramic fastener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of a long-fiber carbon ceramic fastener, comprising the steps of:

[0040] (1) A layer of long fiber non-weft cloth (length * width is 400*400mm, long fiber length is 400mm, fineness is 0.6mm), and a layer of short fiber mesh tire (length * width is 400*400mm, short The fiber length is 65mm and the fineness is 0.6mm), and the layers are alternately laid. The angle between the fiber directions between the adjacent long fiber non-weft fabric layers is 90°. Thickness up to 30mm. Needling 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 weaving is 0.5g / cm 3 Three-dimensional acupuncture preforms, which are finally cut into figure 1 As shown, a three-dimensional needle punched preform with a through hole in the center, the diameter of the through hole being about φ50 mm.

[0041] (2) placing the three-dimensional acupu...

Embodiment 2

[0045] A preparation method of a long-fiber carbon ceramic fastener, comprising the steps of:

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

[0047] (2) placing the three-dimensional acupunct...

Embodiment 3

[0051] A preparation method of a long-fiber carbon ceramic fastener, comprising the steps of:

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

[0053] (2) placing the th...

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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 a long-fiber carbon ceramic fastener, which belongs 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 index of the hot field fasteners is the only way to realize the high temperature graphite furnace (required temperature up to 1000-1400 ℃) and the hot field products. Therefore, the development of high-temperature-resistant and new ultra-high-temperature composite materials to replace high-temperature alloys and refractory metal materials has become the key and foundation for the development of high-performance thermal field accessories. 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-temperature gra...

Claims

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Application Information

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Patent Type & Authority Patents(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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