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Three-dimensional fiber preform reinforced alumina composite material and preparation method thereof

A fiber preform and composite material technology, which is applied in the field of three-dimensional fiber preform reinforced alumina composite material and its preparation, can solve the problems of high porosity, low preparation efficiency and low mechanical properties, and achieves high content and density, Overcome the effects of low density and excellent mechanical properties

Active Publication Date: 2018-03-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the heat treatment temperature in the prior art is basically below 1400°C, and at the same time, due to Al 2 o 3 The influence of physical and chemical state leads to Al 2 o 3 The sintering density is not enough, and the ability to carry and transmit loads is weak
[0010] Therefore, the three-dimensional fiber preforms prepared by existing methods to reinforce Al 2 o 3 Composite materials generally have shortcomings such as low preparation efficiency, high porosity, and low mechanical properties.

Method used

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  • Three-dimensional fiber preform reinforced alumina composite material and preparation method thereof
  • Three-dimensional fiber preform reinforced alumina composite material and preparation method thereof
  • Three-dimensional fiber preform reinforced alumina composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] A three-dimensional fiber preform reinforced alumina composite material of the present invention, comprising a three-dimensional fiber preform and alumina, wherein the alumina is the matrix, the three-dimensional fiber preform is the reinforcing phase, and the alumina is evenly filled in the pores of the three-dimensional fiber preform In and physically combined with the three-dimensional fiber preform, the alumina is α-Al 2 o 3 Ceramics, in this implementation, the porosity of the three-dimensional fiber preform reinforced alumina composite material is 9.6%.

[0044] In this embodiment, the three-dimensional fiber preform is a three-dimensional fiber preform obtained by stacking and sewing carbon fiber cloth, and the volume fraction of fibers in the three-dimensional fiber preform is 48%.

[0045] In this example, the bending strength of the three-dimensional fiber prefabricated alumina composite material is 271MPa, and the fracture toughness is 13.0MPa·m 1 / 2 .

[0...

Embodiment 2

[0056] A three-dimensional fiber prefabricated alumina composite material of the present invention comprises a three-dimensional fiber preform and alumina, wherein alumina is used as a matrix, the three-dimensional fiber preform is used as a reinforcing phase, and alumina is uniformly filled in the three-dimensional fiber preform In the pores and physically bonded to the three-dimensional fiber preform, the alumina is α-Al 2 o 3Ceramics, in this implementation, the porosity of the three-dimensional fiber preform reinforced alumina composite material is 11.2%.

[0057] In this embodiment, the three-dimensional fiber preform is a three-dimensional carbon fiber preform with a three-dimensional five-directional weaving structure, and the volume fraction of fibers in the three-dimensional fiber preform is 52%.

[0058] In this example, the bending strength of the three-dimensional fiber prefabricated alumina composite material is 378MPa, and the fracture toughness is 16.7MPa·m 1 / ...

Embodiment 3

[0069] A three-dimensional fiber prefabricated alumina composite material of the present invention comprises a three-dimensional fiber preform and alumina, wherein alumina is used as a matrix, the three-dimensional fiber preform is used as a reinforcing phase, and alumina is uniformly filled in the three-dimensional fiber preform In the pores and physically bonded to the three-dimensional fiber preform, the alumina is α-Al 2 o 3 Ceramics, in this implementation, the porosity of the three-dimensional fiber preform reinforced alumina composite material is 15.4%.

[0070] In this embodiment, the three-dimensional fiber preform is a three-dimensional carbon fiber preform with a two-dimensional semi-woven structure, and the volume fraction of fibers in the three-dimensional fiber preform is 43%.

[0071] In this example, the bending strength of the three-dimensional fiber prefabricated alumina composite material is 309MPa, and the fracture toughness is 14.8MPa·m 1 / 2 .

[0072] A...

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Abstract

The invention discloses a three-dimensional fiber prefabricated member reinforced aluminum oxide composite material and a preparation method thereof. The three-dimensional fiber prefabricated member reinforced aluminum oxide composite material comprises a three-dimensional fiber prefabricated member and aluminum oxide, wherein the aluminum oxide uniformly fills pores of the three-dimensional fiber prefabricated member and is physically combined with the three-dimensional fiber prefabricated member, the aluminum oxide is alpha-Al2O3 ceramics, and the porosity of the three-dimensional fiber prefabricated member reinforced aluminum oxide composite material is 9 percent to 16 percent. The preparation method comprises: (1) immersing; (2) drying; (3) carrying out the heat treatment; (4) repeating an immersion-drying-heat treatment process of the step (1) to (3). The three-dimensional fiber prefabricated member reinforced aluminum oxide composite material has the advantages of low porosity, high compactness, high stability and excellent mechanical performance. The preparation method is high in preparation efficiency; and moreover, the compactness and the mechanical performance of the prepared composite material are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of high-temperature-resistant fiber-reinforced ceramic-based composite materials, in particular to a three-dimensional fiber preform-reinforced alumina composite material and a preparation method thereof. Background technique [0002] Alumina (Al 2 o 3 ) ceramics, as one of the most stable oxide ceramics, have the characteristics of high hardness, high strength, wear resistance, high temperature resistance, corrosion resistance, high insulation and biocompatibility, and are characterized by early development, low cost and good performance It has become one of the most widely used ceramic materials in the fields of national defense, aerospace, metallurgy, electronics, and medical treatment. [0003] However, for the application requirements of impact protection, high temperature thermal protection and other fields, Al 2 o 3 The mechanical properties of ceramics are still insufficient, the bending strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/624C04B35/64
CPCC04B35/10C04B35/622C04B35/624C04B35/64C04B35/803C04B2235/656C04B2235/96
Inventor 马青松范朝阳曾宽宏
Owner NAT UNIV OF DEFENSE TECH
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