Preparation method of carbon/carbon-boron nitride anti-friction 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 the problems of increased needling difficulty, decreased mechanical properties, easy damage to carbon fibers, etc., and achieves excellent mechanical properties and friction and wear resistance, excellent mechanical properties, and the effect of avoiding damage

Active Publication Date: 2019-04-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of carbon/carbon-boron nitride anti-friction composite material
  • Preparation method of carbon/carbon-boron nitride anti-friction composite material
  • Preparation method of carbon/carbon-boron nitride anti-friction 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 preparation method of a carbon / carbon-boron nitride anti-friction composite material. The preparation method comprises acidizing a graphitized C / C blank, washing the acidizedC / C blank to be neutral to obtain a preprocessed C / C blank, immersing the preprocessed C / C blank into a solution containing modifier for reaction to obtain a functionalized C / C blank, impregnating the functionalized C / C blank with h-BN (hexagonal boron nitride) slurry, then drying the impregnated C / C blank to obtain a C / C-BN precursor, and performing carbonizing densification and graphitization on the C / C-BN precursor with a carbon source to obtain the C / C-BN anti-friction composite material; the modifier is selected from silane coupling agent or polyvinyl alcohol (PVA). According to the preparation method of the carbon / carbon-boron nitride anti-friction composite material, a slurry impregnation method is applied for the first time to produce a BN matrix, and after the C / C blank is functionalized, a slurry impregnation process can effectively introduce BN powder into the C / C blank. The preparation method of the carbon / carbon-boron nitride anti-friction composite material can effectively avoid damage of carbon fiber and ensure excellent structural strength of the C / C-BN composite material; the prepared C / C-BN composite material has excellent friction-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 Applications(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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