Preparation method for reinforcing mullite by using three-dimensional carbon fiber fabric

A three-dimensional carbon fiber and fabric reinforcement technology is applied in the field of preparation of carbon fiber fabric reinforced mullite ceramics, which can solve problems such as low density and achieve the effects of improving toughness, ensuring efficient densification and reducing energy consumption

Active Publication Date: 2011-10-05
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ma Qingsong prepared three-dimensional four-directional carbon fiber fabric-reinforced mullite ceramics using a sol-gel process. However, since the solid content of the mullite sol used is only about 10%, the material preparation requires more than 30 densification cycles, and The density of the material is low, and the porosity is 30~35% (Ma Qingsong, Chen Chaohui, Zheng Wenwei. Preparation and properties of three-dimensional braided carbon fiber reinforced mullite composite materials. Journal of National University of Defense Technology, 2003, 25(6): 26~ 29)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Preparation method for reinforcing mullite by using three-dimensional carbon fiber fabric
  • Preparation method for reinforcing mullite by using three-dimensional carbon fiber fabric
  • Preparation method for reinforcing mullite by using three-dimensional carbon fiber fabric

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Embodiment 1

[0021] A method for preparing three-dimensional carbon fiber fabric reinforced mullite ceramics of the present invention comprises the following specific steps:

[0022] (1) Preparation of mullite sol with high solid phase content: Mix silica sol with a solid phase content of 40% and aluminum sol with a solid phase content of 35% at a mass ratio of 1:3, and let it stand for 12 hours. Obtaining a stable solid phase content is 36.25% mullite sol;

[0023] (2) Select the reinforcement: select the three-dimensional four-way carbon fiber fabric with a volume percentage of 50.5% as the reinforcement;

[0024] (3) Primary densification: use the mullite sol obtained in step (1) as a precursor, introduce it into the three-dimensional carbon fiber fabric, vacuum impregnate it for 4 hours, take it out and let it dry in the air for 2 hours; then the three-dimensional carbon fiber fabric after vacuum impregnation Put the carbon fiber fabric in a vacuum oven, heat up to 150°C at a heating ...

Embodiment 2

[0030] A method for preparing three-dimensional carbon fiber fabric reinforced mullite ceramics of the present invention comprises the following specific steps:

[0031] (1) Preparation of mullite sol with high solid content: Mix silica sol with a solid content of 35% and aluminum sol with a solid content of 30% at a mass ratio of 1:3.5, and let it stand for 24 hours. Obtaining stable solid content is the mullite sol of 31.1%;

[0032] (2) Select the reinforcement: select the three-dimensional four-way carbon fiber fabric with a volume percentage of 55% as the reinforcement;

[0033] (3) Primary densification: use the mullite sol obtained in step (1) as a precursor, introduce it into the three-dimensional carbon fiber fabric, vacuum impregnate it for 8 hours, take it out and let it dry in the air for one hour; then the three-dimensional carbon fiber fabric after vacuum impregnation Put the carbon fiber fabric in a vacuum oven, raise the temperature to 200°C at a heating rate ...

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Abstract

The invention discloses a preparation method for reinforcing mullite by using a three-dimensional carbon fiber fabric, which comprises the following process steps of: preparing mullite sol with high solid content; selecting the three-dimensional carbon fiber fabric serving as a reinforcing body; compacting once; repeatedly compacting for 12 to 14 times; and the like. In preparation method for reinforcing the mullite by using the three-dimensional carbon fiber fabric, a liquid-phase method and low-temperature vacuum sintering are adopted, so the energy consumption and requirements on equipmentare reduced greatly, the preparation period is shortened, the ceramic is compacted efficiently, and mullite ceramic with high mechanical performance is obtained.

Description

technical field [0001] The invention mainly relates to the field of mullite ceramic materials, in particular to a preparation method of carbon fiber fabric reinforced mullite ceramics. 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. To improve the mechanical properties of mullite ceramics, various strengthening and toughening mechanisms have been widely used. It mainly includes particle reinforcement, whisker reinforcement and con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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