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Chopped carbon fiber toughened silicon carbide composite material and preparation method thereof

A technology of chopped carbon fiber and tough silicon carbide, which is applied in the field of fiber toughened composite materials, can solve the problems of low solid content, significant anisotropy of hot pressing and sintering, and the inability to realize the preparation of large-sized parts, and achieve tribological and other properties Excellent effects in high performance, tribology, etc.

Active Publication Date: 2021-07-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the existing chopped carbon fiber toughened silicon carbide composite materials, the slip casting has low solid content, high toxicity of gel casting, significant anisotropy of hot pressing and sintering, and many cracks in spark plasma sintered parts, so it is impossible to realize large size Parts preparation and other issues, the invention provides a chopped carbon fiber toughened silicon carbide (C f / SiC) composite material and preparation method thereof

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  • Chopped carbon fiber toughened silicon carbide composite material and preparation method thereof
  • Chopped carbon fiber toughened silicon carbide composite material and preparation method thereof
  • Chopped carbon fiber toughened silicon carbide composite material and preparation method thereof

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preparation example Construction

[0037] The invention relates to a chopped carbon fiber toughened silicon carbide (C f / SiC) composite materials. The C f / SiC composites consist of a homogeneously dispersed chopped carbon fiber reinforcement and a silicon carbide matrix. Chopped carbon fiber and silicon carbide coated with high carbon residual rate binder are used as raw materials, mixed by dry ball milling, dry pressing, vacuum degreasing (700-1100 °C, 0.5-2h), vacuum reaction infiltration (1450 °C) ~1650℃, 0.5~2h) and other processes to prepare the above C f / SiC composites. The length of the chopped carbon fiber is 10-130 μm, the diameter is 6-8 μm, and the particle size of the silicon carbide powder is 0.5-50 μm. The high carbon residual rate binder may be phenolic resin, and the chopped carbon fibers coated with the high carbon residual rate binder may be chopped carbon fibers coated with phenolic resin. Wherein, the content of phenolic resin in the total volume of the chopped carbon fiber covered w...

Embodiment 1

[0051] This embodiment provides a C f / SiC composite material preparation method, the C f / SiC composite material is obtained by dry pressing forming-reaction infiltration method with phenolic resin-coated chopped carbon fiber, silicon carbide powder, and high-purity silicon powder as raw materials.

[0052] Include the following steps:

[0053] (1) Carbon fiber grafted silane coupling agent: chopped carbon fiber (50g), aminopropyltriethoxysilane (KH550) (0.5g), absolute ethanol (70mL), deionized water (30mL) in 60 React at ℃ for 2 hours to obtain chopped carbon fibers grafted by coupling agent, wherein the content of KH550 is 1 wt% of the carbon fibers. The chopped carbon fiber has a length of 10 to 130 μm and a diameter of 6 μm.

[0054](2) Phenolic resin coated chopped carbon fiber: the ethanol solution of the chopped carbon fiber grafted by the coupling agent of 50g and 50mL phenolic resin (the content of phenolic resin accounts for 25vol of the composite powder of the ...

Embodiment 2

[0060] This embodiment provides a C f / SiC composite material preparation method, the C f / SiC composite material is obtained by dry pressing forming-reaction infiltration method with phenolic resin-coated chopped carbon fiber, silicon carbide powder, and high-purity silicon powder as raw materials.

[0061] Include the following steps:

[0062] (1) Carbon fiber grafted silane coupling agent: chopped carbon fiber (50g), aminopropyltriethoxysilane (KH550) (3g), absolute ethanol (70mL), deionized water (30mL) at 70 ° C The reaction was carried out for 2.5 hours to obtain chopped carbon fibers grafted by the coupling agent, wherein the content of KH550 was 6 wt% of the carbon fibers. The chopped carbon fiber has a length of 10 to 130 μm and a diameter of 7 μm.

[0063] (2) Phenolic resin coated chopped carbon fiber: 50mL ethanol solution of the chopped carbon fiber grafted with 50g described coupling agent and phenolic resin (the content of phenolic resin is 1% of the composit...

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Abstract

The invention relates to a chopped carbon fiber toughened silicon carbide composite material and a preparation method thereof. The preparation method comprises the following steps of: reacting chopped carbon fibers with a silane coupling agent, absolute ethyl alcohol and deionized water to obtain coupling agent grafted chopped carbon fibers; mixing the coupling agent grafted chopped carbon fibers with an organic solution of a high-carbon-residual-rate binder to obtain high-carbon-residual-rate binder coated chopped carbon fibers; mixing the high-carbon-residual-rate binder coated chopped carbon fibers with silicon carbide powder to obtain mixed powder; performing dry pressing on the mixed powder to obtain a biscuit, and performing degreasing treatment to obtain a preform; and carrying out reactive infiltration on the preform to obtain the chopped carbon fiber toughened silicon carbide composite material.

Description

technical field [0001] The present invention specifically relates to a kind of chopped carbon fiber toughened silicon carbide (C f / SiC) composite material and a preparation method thereof, belonging to the field of fiber toughened composite materials. Background technique [0002] Silicon carbide ceramics have excellent properties such as high hardness, high strength, oxidation resistance, corrosion resistance and good thermal stability, so they are widely used in petrochemical, aerospace and other fields. However, the brittle fracture of silicon carbide ceramics is currently the biggest obstacle to its application as high-temperature structural ceramics. Carbon fiber toughened silicon carbide (C f / SiC) composites have the advantages of high specific strength, high specific stiffness, high specific modulus, and low density of carbon fibers. Improve its fracture toughness, make carbon fiber toughened silicon carbide (C f / SiC) composites show ductile fracture, which imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/80C04B35/622C04B35/634C04B35/628C04B35/65
CPCC04B35/565C04B35/622C04B35/63476C04B35/62834C04B35/65C04B2235/6581C04B2235/658C04B2235/428C04B2235/616C04B2235/6562C04B2235/6567C04B2235/5445C04B2235/5436C04B2235/77C04B2235/96
Inventor 黄政仁陈晓殷杰刘学建陈忠明姚秀敏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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