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Carbon fiber reinforced SiAlOC composite material and preparation method thereof

A composite material and carbon fiber technology, which is applied in the field of carbon fiber reinforced SiAlOC composite material and its preparation, can solve the problems of poor mechanical properties of composite materials, low densification efficiency, and low ceramic yield, and achieve good mechanical properties and high temperature resistance. Improve mechanical properties and facilitate operation

Pending Publication Date: 2020-10-09
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon fiber can withstand high temperatures above 2000°C, and SiOC ceramic matrix has a metastable ternary structure, which will cause phase separation at 1200°C, and a carbothermal reduction reaction at 1400°C will cause structural instability and performance degradation. The significant mismatch in temperature resistance makes C / SiOC composites only available for long life at 1250 °C
[0004] The introduction of heterogeneous elements to modify the SiOC ceramic matrix can effectively improve its high temperature resistance. Studies have shown that the effectiveness of introducing Al elements to improve the thermal stability of SiOC ceramics has been proved. The yield is low, which will lead to low densification efficiency and poor mechanical properties of composite materials when preparing composite materials

Method used

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  • Carbon fiber reinforced SiAlOC composite material and preparation method thereof
  • Carbon fiber reinforced SiAlOC composite material and preparation method thereof
  • Carbon fiber reinforced SiAlOC composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of carbon fiber reinforced SiAlOC composite material, comprising the following steps:

[0027] (1) Impregnation: Prepare the three-dimensional four-way braid and place it under vacuum conditions with a pressure of less than 500Pa, and use Al(NO 3 ) 3 9H 2 O and silicone resin mass ratio of 1:5 containing Al-containing polysiloxane precursor solution immersion 1h;

[0028] The polysiloxane precursor solution containing Al is a mixed sol of aluminum-containing sol and silicone resin ethanol solution, and the aluminum-containing sol is composed of Al(NO 3 ) 3 9H 2 O is dissolved in ethanol to obtain, Al(NO 3 ) 3 9H 2 The mass ratio of O to ethanol is 3:10, the mass concentration of the silicone resin ethanol solution is 20%, and the silicone resin is selected from small molecular weight methyl silicone resin (MK);

[0029] (2) Curing: heat the impregnated carbon fiber preform at 60°C for 48 hours until it gels, and then cross-link and cure the ...

Embodiment 2

[0036] A preparation method of carbon fiber reinforced SiAlOC composite material, comprising the following steps:

[0037] (1) Impregnation: Prepare the plain weave laminated stitched preform and place it under a vacuum condition with a pressure less than 500Pa, and use Al(NO 3 ) 3 9H 2 Immerse in an Al-containing polysiloxane precursor solution with a mass ratio of O to silicone resin of 3:10 for 1 h;

[0038] The polysiloxane precursor solution containing Al is a mixed sol of aluminum-containing sol and silicone resin ethanol solution, and the aluminum-containing sol is composed of Al(NO 3 ) 3 9H 2 O is dissolved in ethanol to obtain, Al(NO 3 ) 3 9H 2 The mass ratio of O to ethanol is 1:5, the mass concentration of the silicone resin ethanol solution is 60%, and the silicone resin is selected from small molecular weight methyl silicone resin (MK);

[0039](2) Curing: heat the impregnated carbon fiber preform at 70°C for 30h until it gels, and then cross-link and cure...

Embodiment 3

[0045] A preparation method of carbon fiber reinforced SiAlOC composite material, comprising the following steps:

[0046] (1) Impregnation: Prepare a 2.5-dimensional braid and place it under vacuum conditions with a pressure of less than 500Pa, and use Al(NO 3 ) 3 9H 2 The Al-containing polysiloxane precursor solution with a mass ratio of O to silicone resin of 2.5:10 was immersed for 3 hours;

[0047] The polysiloxane precursor solution containing Al is a mixed sol of aluminum-containing sol and silicone resin ethanol solution, and the aluminum-containing sol is composed of Al(NO 3 ) 3 9H 2 O is dissolved in ethanol to obtain, Al(NO 3 ) 3 9H 2 The mass ratio of O to ethanol is 1:2, the mass concentration of the silicone resin ethanol solution is 40%, and the silicone resin is selected from small molecular weight methyl silicone resin (MK);

[0048] (2) Curing: heat the impregnated carbon fiber preform at 80°C for 24 hours until it gels, and then cross-link and cure t...

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Abstract

The invention discloses a carbon fiber reinforced SiAlOC composite material and a preparation method thereof, a three-dimensional carbon fiber prefabricated part is used as a reinforcement, and the preparation method comprises the following steps: preparing the carbon fiber prefabricated part, placing the carbon fiber prefabricated part under a vacuum condition with the pressure of less than 500 Pa, impregnating the carbon fiber prefabricated part with an Al-containing polysiloxane precursor solution, carrying out heat preservation on the impregnated carbon fiber prefabricated part, then carrying out cross-linking curing at 120-200 DEG C, carrying out cracking for 30-120 minutes at 1000-1200 DEG C in an inert atmosphere and repeating the dipping-curing-cracking period. The C / SiAlOC composite material solves the problem that the high temperature resistance of the C / SiAlOC composite material is limited, and has the advantages of low cost, good thermal stability, simple process flow, lowequipment requirements and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant ceramic-based composite materials, and in particular relates to a carbon fiber reinforced SiAlOC composite material and a preparation method thereof. Background technique [0002] Carbon fiber reinforced SiOC (C / SiOC) composites have excellent properties such as low density, high strength, high toughness, and corrosion resistance. with broadly application foreground. [0003] Carbon fiber can withstand high temperatures above 2000°C, and SiOC ceramic matrix has a metastable ternary structure, which will cause phase separation at 1200°C, and a carbothermal reduction reaction at 1400°C will cause structural instability and performance degradation. The significant mismatch in temperature resistance makes C / SiOC composites only available for long life at 1250°C. [0004] The introduction of heterogeneous elements to modify the SiOC ceramic matrix can effectively improve its high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/56C04B35/622
CPCC04B35/5603C04B35/622C04B2235/3217C04B2235/3418C04B2235/422C04B2235/6567C04B2235/96
Inventor 郭蕾马青松
Owner NAT UNIV OF DEFENSE TECH
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