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Preparation method of chopped carbon fiber reinforced Cf/SiC composite material

A technology for chopped carbon fibers and composite materials, which is applied in the field of carbon fiber reinforced silicon carbide-based composite materials, can solve the problems of affecting the distribution of chopped carbon fibers, high sintering temperature, and unsatisfactory sintering methods.

Inactive Publication Date: 2019-05-03
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering temperature of hot pressing sintering method is high, and too high pressure will affect the temperature of chopped carbon fibers at C f / SiC composites in the distribution, affecting the C f / SiC composites are isotropic in performance, and excessive pressure will also cause damage to chopped carbon fibers
Spark plasma sintering method can obtain dense C f / SiC composite materials, but its sintering method cannot meet the complex shape of C f / SiC composite materials, so it is not satisfied with the actual demand

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  • Preparation method of chopped carbon fiber reinforced Cf/SiC composite material
  • Preparation method of chopped carbon fiber reinforced Cf/SiC composite material
  • Preparation method of chopped carbon fiber reinforced Cf/SiC composite material

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preparation example Construction

[0032] The invention relates to a chopped carbon fiber reinforced C f / SiC composite material preparation method. The C f / SiC composites consist of highly uniformly dispersed chopped carbon fibers and a silicon carbide matrix. Using chopped carbon fiber, silicon carbide powder, silicon powder, etc. The above C f / SiC composites. The C f The solid content of / SiC water-based slurry is ≥65wt%, preferably 65wt%-75wt%, the length of the chopped carbon fiber material is 20-200μm, the diameter is 5-8μm, and the content is C f 30%-45% of the SiC composite material slurry, and the particle size of the silicon carbide powder is 0.5-50 μm. C prepared by the present invention f / SiC has the advantages of high density, isotropic performance, large size, complex size molding, and net size molding. Its excellent mechanical, anti-oxidation, friction and wear properties are suitable for aerospace and other fields.

[0033] The present invention is to C f / SiC composite material pre...

Embodiment 1

[0046] This embodiment provides a C f / SiC composite material preparation method, the C f / SiC composite material is obtained by reaction sintering through grouting molding with chopped carbon fiber, silicon carbide powder and industrial silicon powder as the main raw materials combined with an appropriate amount of dispersant and binder;

[0047] Include the following steps:

[0048] (1) Wet mixing: put chopped carbon fiber, silicon carbide powder, deionized water, dispersant and binder into a ball mill tank in a certain proportion, in which the length of chopped carbon fiber is 20-200μm, the diameter is 7μm, and the content It is 35vol% of the slurry; the particle size of silicon carbide powder is 0.5μm, the dispersant is tetramethylammonium hydroxide, and the content is C f 0.3wt% of the SiC composite material slurry, the binder is polyvinylpyrrolidone, and the polyvinylpyrrolidone content is the C f / 2.0wt% of the SiC composite slurry. Using silicon carbide balls as th...

Embodiment 2

[0053] This embodiment provides a C f / SiC composite material preparation method, the C f / SiC composite material is obtained by reaction sintering through grouting molding with chopped carbon fiber, silicon carbide powder and industrial silicon powder as the main raw materials combined with an appropriate amount of dispersant and binder;

[0054] Include the following steps:

[0055] (1) wet mixing:

[0056] Put chopped carbon fiber, silicon carbide powder, deionized water, dispersant and binder in a certain proportion into the ball mill jar. Among them, the C f The solid content of the slurry of / SiC composite material is 65wt%; the length of the chopped carbon fiber is 20-200μm, the diameter is 8μm, and the content is 30vol%; the particle size of the silicon carbide powder is 5μm; the dispersant is polyammonium methacrylate, content for the C f 0.1wt% of the / SiC composite material slurry; the binder is polyvinyl alcohol, and the content of polyvinyl alcohol is the C f ...

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Abstract

The invention relates to a preparation method of a chopped carbon fiber reinforced Cf / SiC composite material. The method comprises the following steps: mixing chopped carbon fibers, silicon carbide powder, a dispersant, a binder and water to obtain slurry; performing slip casting on the slurry to obtain a green body; performing heat treatment on the green body under vacuum conditions at 800-1200 DEG C for 0.5-2 h to obtain a preform; and embedding the preform by using silicon powder, and performing sintering under vacuum conditions at 1450-1700 DEG C for 0.5-2 h to obtain the chopped carbon fiber reinforced silicon carbide based composite material.

Description

technical field [0001] The invention belongs to the field of carbon fiber-reinforced silicon carbide-based composite materials, in particular to a chopped carbon fiber-reinforced C f / SiC composite material and its preparation method. Background technique [0002] Carbon fiber reinforced silicon carbide matrix composites (C f / SiC composites) have unique energy dissipation mechanisms such as crack deflection, fiber pullout, and fiber debonding, which make them exhibit non-catastrophic failure characteristics similar to metals, thereby greatly improving their reliability in engineering applications. In addition, C f / SiC composite materials combine the advantages of SiC ceramics and carbon fibers in high temperature resistance, corrosion resistance, high specific stiffness, high thermal conductivity, and low density. As high-temperature structural materials, they are widely used in aerospace, military, energy and other fields. Among them, chopped carbon fiber reinforced si...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/65
Inventor 黄政仁孟祥玮朱云洲裴兵兵吴西士陈健姚秀敏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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