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A kind of short fiber reinforced carbon/resin composite material hot pressing molding demoulding method

A technology of resin composite material and short fiber reinforcement, which is applied in the field of carbon/carbon composite material and its preparation, can solve the problems of affecting the surface quality of the green body, affecting the mold fit, and large demoulding resistance, etc., to improve the resistance to hot pressing and pressing Mosaic performance, reduced demoulding resistance, easy demoulding effect

Active Publication Date: 2022-07-08
湖南科嘉新材料有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when large-sized short fiber reinforced carbon / resin composites are molded, the resin is very easy to adhere to the surface of the mold, resulting in high demoulding resistance after curing, and affecting the surface quality of the green body after demoulding
During the repeated use of the mold, it is necessary to continuously polish the upper and lower die punches and the inner wall of the female mold. Long-term use will affect the fit of the mold

Method used

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  • A kind of short fiber reinforced carbon/resin composite material hot pressing molding demoulding method
  • A kind of short fiber reinforced carbon/resin composite material hot pressing molding demoulding method
  • A kind of short fiber reinforced carbon/resin composite material hot pressing molding demoulding method

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Embodiment 1

[0027] A short-fiber reinforced carbon / resin composite material hot-pressing and demolding method, comprising (1) adding a surface-treated 65Mn separator between a blank and upper and lower die punches during hot-pressing, and (2) placing a Use mold release agent on the contact surface between the inner wall of the mold and the 65Mn separator and the body;

[0028] The 65Mn separator adopts the carbonitride (C, N) co-infiltration method for surface treatment, which specifically includes the following steps:

[0029] (a) In the pit furnace, drip methanol at a speed of 80 drops / min, and feed ammonia gas at a speed of 350 L / h, control the temperature to be about 830 °C, and the time is 3 hours;

[0030] (b) After carbonitriding, oil is cooled to room temperature and then quenched + tempered at medium temperature. The quenching temperature is 830°C. After holding for 20min, the oil is cooled to room temperature and tempered at 430°C for 2h.

[0031] The mold release agent contain...

Embodiment 2

[0038] A short-fiber reinforced carbon / resin composite material hot-pressing and demolding method, comprising (1) adding a surface-treated 65Mn separator between a blank and upper and lower die punches during hot-pressing, and (2) placing a Use mold release agent on the contact surface between the inner wall of the mold and the 65Mn separator and the body;

[0039] The 65Mn separator adopts the carbonitride (C, N) co-infiltration method for surface treatment, which specifically includes the following steps:

[0040] (a) In the pit furnace, drip methanol at a speed of 100 drops / min, and feed ammonia gas at a speed of 500 L / h, control the temperature to be about 830 °C, and the time is 2 hours;

[0041] (b) After carbonitriding, oil is cooled to room temperature and then quenched + tempered at medium temperature. The quenching temperature is 830°C. After holding for 20min, the oil is cooled to room temperature and tempered at 430°C for 2h.

[0042] The mold release agent contai...

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Abstract

The invention discloses a short fiber reinforced carbon / resin composite material hot pressing molding demoulding method, which includes the following contents: (1) C and N co-infiltration technology on the surface of a 65Mn separator for hot pressing molding demoulding, adopting dripping methanol to pass ammonia The 65Mn separator is carbonitrided by the gas method; (2) a mold release agent for hot pressing molding, the specific components are 10%-30% flake graphite powder, 20%-40% nano-scale cubic nitriding The mixed powder of boron powder and 30%-50% nano-scale zirconia powder is composed of polyethylene glycol as a binder. The process of the invention is simple, the process parameters are easy to control, the smoothness after grinding and polishing of the separator for hot-pressing molding, the anti-hot-pressing inlay performance and the anti-hot-pressing die-bonding performance are improved, and the hot-pressed short fiber reinforced carbon / mold is significantly improved. Surface quality and production efficiency of resin composites.

Description

technical field [0001] The invention relates to a carbon / carbon composite material and a preparation technology thereof, in particular to a hot-pressing molding demoulding method for a short-fiber reinforced carbon / resin composite material. Background technique [0002] Carbon fiber reinforced carbon matrix composites have the characteristics of low density, high thermal conductivity, high specific strength, specific modulus, low thermal expansion coefficient, ablation resistance and thermal shock resistance. They have been widely used in rocket nozzles, space shuttles and other high temperature Wear-resistant aerospace technology. At present, with the continuous advancement of research on carbon / carbon composite materials, its application scope has gradually expanded to various fields such as nuclear energy, chemical industry, medical treatment, and civil materials. Due to the excellent properties of carbon / carbon composites, its wide application is an ideal goal for us. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/42B29C33/44B29C33/48B29C33/60
CPCB29C70/42B29C33/48B29C33/60B29C33/44
Inventor 沈玮俊李擎万维华陈奇志何进喻林萍
Owner 湖南科嘉新材料有限公司
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