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Three-dimensional carbon fiber fabric reinforced mullite ceramic and preparation method thereof

A carbon fiber fabric and three-dimensional carbon fiber technology is applied in the field of three-dimensional carbon fiber fabric reinforced mullite ceramics and its preparation, and can solve the problems of insufficient mechanical properties, insufficient toughness and strength, and low material density of three-dimensional carbon fiber reinforced mullite ceramics. , to ensure efficient densification, increased strength retention, and improved mechanical properties

Active Publication Date: 2013-02-06
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are relatively few studies on three-dimensional carbon fiber reinforced mullite ceramics at home and abroad. The mechanical properties of the developed three-dimensional carbon fiber reinforced mullite ceramics are not good enough, such as insufficient toughness and strength, low modulus, and strength retention after oxidation in high temperature air. The rate is low; at the same time, the method of preparing three-dimensional carbon fiber reinforced mullite ceramics has a long cycle and low material density

Method used

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  • Three-dimensional carbon fiber fabric reinforced mullite ceramic and preparation method thereof
  • Three-dimensional carbon fiber fabric reinforced mullite ceramic and preparation method thereof
  • Three-dimensional carbon fiber fabric reinforced mullite ceramic and preparation method thereof

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Embodiment 1

[0027] a kind of like figure 1 The shown three-dimensional carbon fiber fabric reinforced mullite ceramics of the present invention uses mullite as a matrix, and a three-dimensional carbon fiber fabric with a volume fraction of 50.5% is used as a reinforcement, and there is formed between the mullite matrix and the three-dimensional carbon fiber fabric reinforcement. The silicon carbide interface phase is formed by preparing a silicon carbide coating on the surface of the three-dimensional carbon fiber fabric. In this ceramic, the ceramic matrix is ​​made of mullite sol with a solid phase content of 36.25%, and the mullite sol is made of silica sol with a solid phase content of 40% and a solid phase content of 35% with a mass ratio of 1:3. % aluminum sol mixed uniformly.

[0028] A method for preparing the above-mentioned three-dimensional carbon fiber fabric reinforced mullite ceramics, comprising the following specific steps:

[0029] (1) Preparation of silicon carbide coa...

Embodiment 2

[0040] A kind of three-dimensional carbon fiber fabric reinforced mullite ceramics of the present invention, with mullite as matrix, with the three-dimensional carbon fiber fabric that volume fraction is 55% as reinforcing body, form carbonization between mullite matrix and three-dimensional carbon fiber fabric reinforcing body The silicon interface phase and the silicon carbide interface phase are formed by preparing a silicon carbide coating on the surface of a three-dimensional carbon fiber fabric. In this ceramic, the ceramic matrix is ​​made of mullite sol with a solid phase content of 31.1%, and the mullite sol is made of Silica sol with a solid phase content of 35% and aluminum sol with a solid phase content of 30% are uniformly mixed with a mass ratio of 1:3.5.

[0041] A method for preparing the above-mentioned three-dimensional carbon fiber fabric reinforced mullite ceramics, comprising the following specific steps:

[0042] (1) Preparation of silicon carbide coating...

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Abstract

The invention discloses a three-dimensional carbon fiber fabric reinforced mullite ceramic. In the ceramic, mullite is used as a matrix, a three-dimensional carbon fiber fabric is used as a reinforcement body, and a silicon carbide boundary phase is form between the mullite matrix and the three-dimensional carbon fiber fabric reinforcement body by preparing a silicon carbide coating on the surface of the three-dimensional carbon fiber fabric. The invention also discloses a preparation method of the ceramic. The preparation method comprises the following process steps of: preparing the silicon carbide coating; preparing mullite sol with high solid content; densifying one time; densifying repeatedly, and the like. The mullite ceramic has the advantages of high mechanical property such as high toughness and high intensity; and the preparation method of the mullite ceramic has the advantages of short cycle, low cost and capability of effectively improving the densification of a material.

Description

technical field [0001] The invention mainly relates to the field of mullite ceramic materials, in particular to a three-dimensional carbon fiber fabric reinforced mullite ceramic and a preparation method thereof. Background technique [0002] Mullite ceramics have excellent high temperature oxidation resistance, corrosion resistance, low thermal expansion coefficient, low thermal conductivity, high temperature creep resistance and other characteristics, and its most significant advantage is that the mechanical properties increase with the increase of temperature, based on the above reasons , Mullite ceramics are considered to be a very ideal high-temperature engineering ceramics. However, the low room temperature mechanical properties of mullite ceramics severely limit the application of this material. In order to improve the mechanical properties of mullite ceramics, various strengthening and toughening mechanisms are widely used, mainly including particle reinforcement, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/185C04B35/624
Inventor 刘海韬马青松徐天恒陈树刚陈朝辉
Owner NAT UNIV OF DEFENSE TECH
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