Boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic and preparation method thereof

A technology of alumina fiber and aluminosilicate, which is applied in the field of oxide fiber fabric reinforced oxide ceramic materials, can solve the problems of complex preparation process of interface coating, insignificant modification effect, and limitation of practical application, etc., and achieve toughness and Increased strength, excellent chemical corrosion resistance, reduced energy consumption and the effects of equipment requirements

Active Publication Date: 2015-07-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing interface coating preparation process is complicated, the modification effect is not significant, and the cost is high, which limits its practical application

Method used

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  • Boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic and preparation method thereof
  • Boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic and preparation method thereof
  • Boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic and preparation method thereof

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Embodiment 1

[0027] a kind of like figure 1 The three-dimensional alumina fiber fabric-reinforced aluminosilicate ceramics containing the interface phase of the present invention is shown, which uses aluminosilicate as a matrix and a three-dimensional alumina fiber fabric with a volume fraction of 42.3% as a reinforcement, and aluminosilicate A boron nitride interface phase is formed between the salt matrix and the three-dimensional alumina fiber fabric reinforcement, and the boron nitride interface phase is formed by preparing a boron nitride coating on the surface of the three-dimensional alumina fiber fabric. In this ceramic, the aluminosilicate as the matrix is ​​made of Al with a solid phase content of 28.5%. 2 o 3 -SiO 2 A biphasic sol was prepared.

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

[0029] (1) Preparation of boron nitride coating: prepare a thre...

Embodiment 2

[0038] A three-dimensional alumina fiber fabric reinforced aluminosilicate ceramic containing an interface phase of the present invention, which uses aluminosilicate as a matrix and a three-dimensional alumina fiber fabric with a volume fraction of 44.5% as a reinforcement, and aluminosilicate A boron nitride interface phase is formed between the salt matrix and the three-dimensional alumina fiber fabric reinforcement, and the boron nitride interface phase is formed by preparing a boron nitride coating on the surface of the three-dimensional alumina fiber fabric. In this ceramic, the aluminosilicate as the matrix is ​​made of Al with a solid phase content of 30%. 2 o 3 -SiO 2 A biphasic sol was prepared.

[0039] A method for preparing the above-mentioned three-dimensional alumina fiber fabric reinforced aluminosilicate ceramics, comprising the following specific steps:

[0040] (1) Preparation of boron nitride coating: prepare a three-dimensional alumina fiber fabric with ...

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Abstract

The invention discloses a boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic and a preparation method thereof. According to the preparation method, aluminosilicate is used as a matrix and a three-dimensional aluminum oxide fiber fabric is used as a reinforcing body, and a boron nitride boundary phase is formed between the matrix and the reinforcing body, wherein the boundary phase is prepared in a way of preparing a boron nitride coating on the surface of the fiber fabric. The preparation method of the product disclosed by the invention comprises the following steps: first, preparing the boron nitride coating on the surface of the three-dimensional aluminum oxide fiber fabric in the process from vacuum impregnation to pyrolysis; and then, by taking a Al2O3-SiO2 diphasic sol as a precursor, repeatedly densifying to obtain the boundary phase-containing three-dimensional aluminum oxide fiber fabric-reinforced aluminosilicate ceramic. The product provided by the invention has the advantages of excellent mechanical and dielectric properties, short preparation period, low cost and the like.

Description

technical field [0001] The invention mainly relates to the field of oxide fiber fabric reinforced oxide ceramic materials, in particular to a three-dimensional alumina fiber fabric reinforced aluminosilicate ceramic and a preparation method thereof. Background technique [0002] Aluminosilicate ceramics have the advantages of excellent high temperature resistance and good chemical stability, and can be used for a long time in a high temperature oxidizing environment. However, single aluminosilicate ceramics generally have low toughness and are prone to catastrophic failure. In order to improve the mechanical properties of aluminosilicate ceramics, various toughening mechanisms are widely used, mainly including particle reinforcement, whisker reinforcement and continuous fiber reinforcement, among which particle and whisker toughening can significantly improve the toughening mechanism of aluminosilicate ceramics. Strength, but the improvement of its toughness is low, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/16C04B35/10C04B35/622
Inventor 王义程海峰刘海韬祖梅王军周永江
Owner NAT UNIV OF DEFENSE TECH
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