A kind of preparation method of carbon/carbon-boron nitride antifriction composite material

A technology of composite materials and boron nitride, which is applied in the field of preparation of carbon/carbon-boron nitride anti-friction composite materials, can solve problems such as easy damage to carbon fibers, decline in mechanical properties, and increased difficulty in acupuncture, so as to avoid damage, Effect of friction coefficient and wear rate reduction, excellent mechanical properties and friction and wear properties

Active Publication Date: 2021-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, this method will increase the difficulty of acupuncture, and on the other hand, BN powder will easily damage the carbon fiber, resulting in a decrease in mechanical properties.

Method used

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  • A kind of preparation method of carbon/carbon-boron nitride antifriction composite material
  • A kind of preparation method of carbon/carbon-boron nitride antifriction composite material
  • A kind of preparation method of carbon/carbon-boron nitride antifriction composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) The density is 0.55g / cm 3 The three-dimensional needle-punched carbon felt is laminated with T-700 non-weft carbon cloth and mesh tire, and the fiber direction of the adjacent non-weft carbon cloth is vertical, and the carbon felt is prepared by the relay puncture process.

[0071] (2) Vacuum heat treatment: The three-dimensional needle-punched carbon felt is used as a prefabricated part, and the temperature is raised to 2100°C in a vacuum atmosphere at an appropriate heating rate (10°C / min) for vacuum heat treatment, and the holding time is 1h.

[0072] (3) Chemical vapor infiltration: Propylene is the carbon source gas, and the needle-punched integral felt preform is deposited for 30-40 hours to obtain a density of about 0.7g / cm 3 The C / C prefab. Then graphitize the C / C preform at 2100°C for 1 hour.

[0073] (4) Functional group grafting of low-density body

[0074] Soak the low-density green body obtained in step (1) in dilute nitric acid (concentration) for a...

Embodiment 2

[0083] (1) The density is 0.55g / cm 3 The three-dimensional needle-punched carbon felt is laminated with T-700 non-weft carbon cloth and mesh tire, and the fiber direction of the adjacent non-weft carbon cloth is vertical, and the carbon felt is prepared by the relay puncture process.

[0084] (2) Vacuum heat treatment: The three-dimensional needle-punched carbon felt is used as a prefabricated part, and the temperature is raised to 2100°C in a vacuum atmosphere at an appropriate heating rate (10°C / min) for vacuum heat treatment, and the holding time is 1h.

[0085] (3) Chemical vapor infiltration: Propylene is the carbon source gas, and the needle-punched integral felt preform is deposited for 30-40 hours to obtain a density of about 0.7g / cm 3 The C / C prefab. Then graphitize the C / C preform at 2100°C for 1 hour.

[0086] (4) Functional group grafting of low-density body

[0087] Soak the low-density body obtained in step (1) in dilute nitric acid (concentration) for acidifi...

Embodiment 3

[0095] (1) The density is 0.55g / cm 3 The three-dimensional needle-punched carbon felt is laminated with T-700 non-weft carbon cloth and mesh tire, and the fiber direction of the adjacent non-weft carbon cloth is vertical, and the carbon felt is prepared by the relay puncture process.

[0096] (2) Vacuum heat treatment: The three-dimensional needle-punched carbon felt is used as a prefabricated part, and the temperature is raised to 2100°C in a vacuum atmosphere at an appropriate heating rate (10°C / min) for vacuum heat treatment, and the holding time is 1h.

[0097] (3) Chemical vapor infiltration: Propylene is the carbon source gas, and the needle-punched integral felt preform is deposited for 30-40 hours to obtain a density of about 0.7g / cm 3 The C / C prefab. Then graphitize the C / C preform at 2100°C for 1 hour.

[0098] (4) Functional group grafting of low-density body

[0099] Soak the low-density body obtained in step (1) in dilute nitric acid (concentration) for acidifi...

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Abstract

The invention discloses a method for preparing a carbon / carbon-boron nitride friction-reducing composite material. The graphitized C / C green body is acidified, washed to neutral to obtain a pretreated C / C green body, and then soaked In a solution containing a modifier, react to obtain a functionalized C / C green body, and then immerse the functionalized C / C green body in the h-BN slurry, and dry to obtain a C / C-BN prefabricated body, C / C-BN prefabricated body is carbonized and densified by carbon source, and graphitized to obtain C / C-BN antifriction composite material; the modifier is selected from silane coupling agent or polyvinyl alcohol (PVA) . The invention adopts the slurry impregnation method firstly to obtain the BN matrix. After functionalizing the C / C body, the BN powder can be effectively introduced into the C / C body during the slurry impregnation process. This method can effectively avoid the damage of carbon fibers and ensure the excellent structural strength of C / C‑BN composites. The obtained C / C‑BN composites have excellent friction and wear properties.

Description

technical field [0001] The invention relates to a preparation method of a carbon / carbon-boron nitride friction-reducing composite material, which belongs to the technical field of new materials. Background technique [0002] C / C composite materials have the advantages of low density, high strength, excellent thermal conductivity, suitable friction coefficient, small volume wear, and good processability. They have been widely used in brake materials, and are also used in many autoclaves and chemical equipment. And friction in high-speed rotating mechanical structures is the first material. The application of C / C composite materials as seals between aero-engine shafts requires low friction coefficient and small wear, which has become the focus of research at home and abroad. [0003] However, the C / C friction material starts to oxidize at about 400°C in the air, which significantly reduces the braking performance and service life of the material, and when it is used as a seal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/80C04B35/5833C04B35/52C04B35/622
CPCC04B35/52C04B35/583C04B35/622C04B35/80C04B35/83C04B2235/77C04B2235/96
Inventor 刘富海易茂中冉丽萍
Owner CENT SOUTH UNIV
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