Composite sheet based on glassy carbon and carbon additives and method for its preparation

A technology of composite thin plates and additives, applied in the field of composite materials, can solve problems such as difficult graphitization, long production cycle, complex process, etc.

Inactive Publication Date: 2011-12-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, in the process of preparing glassy carbon with phenolic resin and furfural resin as carbon precursors, the process is complex, the production cycle is long, t...

Method used

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  • Composite sheet based on glassy carbon and carbon additives and method for its preparation
  • Composite sheet based on glassy carbon and carbon additives and method for its preparation
  • Composite sheet based on glassy carbon and carbon additives and method for its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The randomly arranged PAN-based chopped carbon fibers with a volume percentage of 20% and an average length of about 10 mm are immersed in a N, N-dimethylacetamide solution of polyamic acid (PMDA / ODA system) with a solid content of 10% , place the mixture on the substrate, control the thickness to 300 microns, heat at 60°C for 1 hour, at 90°C for 1 hour, at 120°C for 1 hour, and at 150°C for 1 hour. After removing the polar solvent, place in a vacuum oven at 180 ℃ for 1 hour, 200°C for 1 hour, 250°C for 1 hour, and 300°C for 1 hour to complete the imidization, thereby forming a polyimide precursor / carbon composite film with a thickness of about 30 microns. The obtained composite film has a tensile strength of 230 MPa.

Embodiment 2

[0030] The procedure was the same as in Example 1, replacing the randomly arranged PAN-based chopped carbon fibers with randomly arranged long carbon fibers. The composite film obtained at this time had a tensile strength of 300 MPa.

Embodiment 3

[0032] The procedure was the same as in Example 1, replacing the randomly arranged PAN-based chopped carbon fibers with woven long carbon fibers. The tensile strength of the composite film obtained at this time was 700 MPa.

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Abstract

A composite thin plate based on glassy carbon and carbon additives in the technical field of composite materials and its preparation method, by carbonizing the polyimide precursor film at a temperature lower than 2500 ° C, the glassy carbon and carbon additives are obtained. Composite sheets of objects. The flexural strength of the composite sheet prepared by the invention can reach 1500MPa.

Description

technical field [0001] The invention relates to a material in the technical field of composite materials and a preparation method thereof, in particular to a composite sheet based on glassy carbon and carbon additives and a preparation method thereof. Background technique [0002] Carbon / carbon composite material is a new type of engineering material with special properties. It uses carbon fiber or various fabric-reinforced carbon as a reinforcing material, and uses graphitized resin (or pitch) or chemical vapor deposition (CVD) carbon as a matrix. Through processing Processing made of full carbon composite materials. As a composite material almost entirely composed of carbon elements, carbon / carbon composites have low density, high strength, small thermal expansion coefficient, good thermal shock resistance, fatigue resistance, creep resistance, corrosion resistance, wear resistance and Excellent and unique properties such as high strength and modulus at high temperature, ...

Claims

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Application Information

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IPC IPC(8): C04B35/83
Inventor 张亚非胡南滔魏浩
Owner SHANGHAI JIAO TONG UNIV
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