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Three-dimensional alumina fiber fabric reinforced oxide ceramic and preparation method thereof

A technology of alumina fiber and oxide ceramics, which is applied in the field of three-dimensional alumina fiber fabric reinforced oxide ceramics and its preparation, can solve the problems of aggravated fiber thermal damage, high sintering temperature, and difficulty in forming three-dimensional complex structures, so as to improve mechanical properties The effect of performance, low preparation temperature, and easy molding of three-dimensional complex structures

Active Publication Date: 2014-07-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the porous matrix is ​​mainly composed of ceramic micropowders, its sintering temperature is generally high (>1200°C), which is easy to aggravate the thermal damage of fibers
In addition, through the process analysis, it can be known that the existing technology is suitable for the preparation of one-dimensional or two-dimensional porous matrix oxide CMCs, and it is difficult to form three-dimensional complex structures

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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  • Three-dimensional alumina fiber fabric reinforced oxide ceramic and preparation method thereof
  • Three-dimensional alumina fiber fabric reinforced oxide ceramic and preparation method thereof
  • Three-dimensional alumina fiber fabric reinforced oxide ceramic and preparation method thereof

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Embodiment 1

[0035] a kind of like figure 1 The three-dimensional alumina fiber fabric reinforced oxide ceramics of the present invention shown, the ceramics are based on Al 2 o 3 , SiO 2 and SiOC ceramics as the matrix, and a three-dimensional alumina fiber fabric with a volume fraction of 40% as the reinforcement. Al in matrix 2 o 3 and SiO 2 is introduced through the sol-gel process to form porous Al 2 o 3 -SiO 2 Composite matrix, SiOC ceramics are mainly filled with Al after pyrolysis of polysiloxane 2 o 3 -SiO 2 obtained in the pores of the composite matrix; Al 2 o 3 -SiO 2 The volume fraction of the composite matrix is ​​30%, the volume fraction of SiOC ceramics is 12%, and the rest are pores. Among them, Al in the matrix 2 o 3 and SiO 2 It is obtained by transformation of oxide sol with a solid phase content of 32% (AS21 silicon-aluminum composite sol, produced by Suzhou Nadi Microelectronics Co., Ltd.), and SiOC ceramics are obtained by transformation of polysiloxa...

Embodiment 2

[0048] A kind of three-dimensional alumina fiber fabric of the present invention strengthens oxide ceramics, and this ceramics is based on Al 2 o 3 , SiO 2 and SiOC ceramics as the matrix, and a three-dimensional alumina fiber fabric with a volume fraction of 41% as the reinforcement. Al in matrix 2 o 3 and SiO 2 is introduced through the sol-gel process to form porous Al 2 o 3 -SiO 2 Composite matrix, SiOC ceramics are mainly filled with Al after pyrolysis of polysiloxane 2 o 3 -SiO 2 obtained in the pores of the composite matrix; Al 2 o 3 -SiO 2 The volume fraction of the composite matrix is ​​26%, the volume fraction of SiOC ceramics is 8%, and the rest is pores. Among them, Al in the matrix 2 o 3 and SiO 2 It is obtained by converting an oxide sol with a solid content of 33.5%, and the SiOC ceramic in the matrix is ​​obtained by converting a polysiloxane-ethanol solution with a mass concentration of 60%.

[0049] A method for preparing the above-mentioned ...

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Abstract

The invention discloses three-dimensional alumina fiber fabric reinforced oxide ceramic. Al2O3, SiO2 and SiOC ceramics are used as a substrate, a three-dimensional alumina fiber fabric is used as a reinforcing body, alumina and silicon dioxide in the substrate are introduced by a sol-gel process, and the SiOC ceramic is obtained by high-temperature cracking of polysiloxane. The preparation method of the three-dimensional alumina fiber fabric reinforced oxide ceramic comprises the following steps: performing vacuum soaking, gelating and high-temperature ceramic treatment on oxide sol serving as a precursor, and repeating for multiple times to obtain an alumina fiber reinforced oxide blank body; soaking the blank body in vacuum by using a polysiloxane-ethanol solution as a precursor, and performing crosslinking and high-temperature ceramic treatment to complete a densifying process; and repeating the steps for multiple times to obtain the oxide ceramic blank body, and oxidizing to prepare the three-dimensional alumina fiber fabric reinforced oxide ceramic. The three-dimensional alumina fiber fabric reinforced oxide ceramic has the advantages of high bending strength, high modulus, good interlaminar shear strength and the like.

Description

technical field [0001] The invention relates to the field of oxide ceramic materials, in particular to a three-dimensional alumina fiber fabric reinforced oxide ceramic and a preparation method thereof. Background technique [0002] Continuous fiber reinforced ceramic matrix composites (CFRCMCs) have excellent mechanical properties and high temperature resistance, and have broad application prospects in the aerospace field. The commonly used reinforcing fibers in CFRCMCs are carbon fiber, silicon carbide fiber and oxide fiber. Among them, carbon fiber and silicon carbide fiber reinforced CMCs have excellent mechanical properties and high temperature resistance, and have been successfully applied to high temperature components of aero-engines. However, the above two fiber-reinforced CMCs are prone to oxidation and failure in the service environment of aero-engines (high temperature, containing oxygen, water vapor, and carbon dioxide, etc.), which greatly limits their applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/01C04B35/622
Inventor 刘海韬程海峰王义祖梅周永江王军
Owner NAT UNIV OF DEFENSE TECH
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