High-density flexible carbon/carbon composite friction material and preparation method thereof

A friction material and carbon composite technology, applied in the field of friction materials, can solve the problems of poor weaving, not easy to bend, high modulus of carbon fiber, etc., and achieve the effect of high bending, excellent flexibility and good flexibility

Active Publication Date: 2019-04-02
昆山盛夏复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the current carbon-carbon composite material is a rigid material and is not easy to bend, it cannot be applied to the automotive synchronizer ring. At the same time, due to the high modulus of carbon fiber, the weaving property is relatively poor, and it is difficult to weave into products with high curvature of warp and weft yarns. Product flexibility is poor

Method used

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  • High-density flexible carbon/carbon composite friction material and preparation method thereof
  • High-density flexible carbon/carbon composite friction material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 A high-density flexible carbon / carbon composite friction material shown, its preparation process includes the following steps:

[0026] Step 1: Prepare pre-oxidized silk.

[0027] Select 1K polyacrylonitrile fibers and put them into the pre-oxidation furnace, driven by the rotation of the guide roller in the pre-oxidation furnace, they pass through the four temperature zones of the pre-oxidation furnace in sequence. The set temperatures are as follows: the temperature in the first zone is 180-210°C, the temperature in the second zone is 220-250°C, the temperature in the third zone is 270-280°C, the temperature in the fourth zone is 290-300°C, and the duration is 60 minutes. Finally, the carbon content is greater than 65%. Oxidized silk. The obtained preoxidized silk still has high flexibility and is easy to weave.

[0028] The second step: preparing twisted pre-oxidized yarn, that is, passing the pre-oxidized yarn through twisting equipment, and twis...

Embodiment 2

[0037] Step 1: Prepare pre-oxidized silk.

[0038] Select 3K viscose-based fibers and put them into the pre-oxidation furnace, driven by the rotation of the guide roller in the pre-oxidation furnace, they pass through the four temperature zones of the pre-oxidation furnace in turn. The set temperatures are as follows: the first zone temperature is 180-200°C, the second zone temperature is 210-230°C, the third zone temperature is 240-260°C, the fourth zone temperature is 270-300°C, pre-oxidize for 90 minutes, and the carbon content is greater than 65%. pre-oxidized silk.

[0039] Step 2: prepare twisted pre-oxidized yarn, pass the pre-oxidized yarn through twisting equipment, and twist to 0.2-1 twist / cm.

[0040] Step 3: Weaving into a woven structure

[0041] The pre-oxidized silk cloth is woven according to the warp and weft density of 7 (±0.5)*7 (±0.5) threads / cm to form a flexible weaving structure.

[0042] Step 4: Preparation of carbon cloth

[0043] Under the protect...

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Abstract

The invention discloses a high-density flexible carbon/carbon composite friction material and a preparation method thereof. The preparation method comprises the following steps: successively subjecting polyacrylonitrile fiber, viscose-based fiber, pitch-based fiber and the like to pre-oxidation treatment, and weaving pre-oxidized fiber yarns into a fabric; then subjecting woven fabric to carbonization treatment so as to obtain a carbon fiber fabric; and placing the carbon fiber fabric into gaseous CxHy, and carrying out chemical vapor deposition treatment under the protection of N2 so as to prepare the high-density flexible carbon/carbon composite material. Thus, a carbon fiber fabric reinforced carbon-based composite material with a warp and weft yarn curvature of more than 30 degrees isfinally obtained. According to the invention, by utilization of low modulus of pre-oxidized yarns, the pre-oxidized yarns are easy to be woven into a product with high warp and weft yarn curvature, facilitate reaching a thickness required for the design, and have excellent flexibility at the same time; and after carbonization and CVD deposition carbon treatment of the pre-oxidized yarns, a carbon/carbon friction material with good flexibility can be obtained.

Description

technical field [0001] The invention belongs to the technical field of friction materials, and in particular relates to a high-density flexible carbon / carbon composite friction material and a preparation method thereof. Background technique [0002] The synchronizer is an important part of the gearbox, which can effectively ensure the smooth shifting, simplify the operation and reduce the labor intensity of the driver. With the development of trucks in the direction of large tonnage and high torque, higher and higher requirements are put forward for the synchronizer. The friction material used for the traditional synchronizer ring has low strength, poor wear resistance, unstable friction coefficient, and short service life. Can no longer meet the usage requirements. Carbon fiber reinforced carbon-based composite materials have stable friction coefficient, high temperature resistance, corrosion resistance, impact resistance, wear resistance and other characteristics. They ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/84
CPCC04B35/83C04B2235/48
Inventor 单云刚龚承涛陆千夏赵志清
Owner 昆山盛夏复合材料科技有限公司
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