Three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material and preparation method thereof

A technology of fiber prefabricated parts and three-dimensional silicon carbide, which is applied in ceramic products, other household appliances, applications, etc., can solve the problems of undiscovered three-dimensional silicon carbide fiber prefabricated parts reinforced yttrium silicate composite materials, less gaseous raw materials, and deposition characteristics. Unsatisfactory and other problems, to achieve the effect of excellent oxidation resistance, high densification efficiency, and excellent mechanical properties

Active Publication Date: 2018-01-30
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And for fiber-reinforced yttrium silicate composites, currently suitable for depositing Y 2 o 3 and SiO 2 The gaseous raw material is too little, and the deposition characteristics are not ideal, while the liquid raw material is relatively easy to obtain, and the performance is reliable.
So far, there is no research report on the preparation of three-dimensional silicon carbide fiber preforms reinforced yttrium silicate composites by liquid phase method

Method used

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  • Three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material and preparation method thereof
  • Three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material and preparation method thereof
  • Three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material of the present invention comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, wherein the yttrium silicate is a matrix, the three-dimensional silicon carbide fiber preform is a reinforcing phase, and silicic acid Yttrium is uniformly filled in the voids of the three-dimensional silicon carbide fiber preform, and the crystal phase is Y 2 Si 2 o 7 , In this implementation, the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 13.6%.

[0047] In this embodiment, the three-dimensional silicon carbide fiber preform is a three-dimensional silicon carbide fiber preform obtained by laminating and sewing silicon carbide fiber cloth, and the volume fraction of fibers in the three-dimensional silicon carbide fiber preform is 46%.

[0048] In this example, the bending strength of the three-dim...

Embodiment 2

[0059] A three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material of the present invention comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, wherein the yttrium silicate is a matrix, the three-dimensional silicon carbide fiber preform is a reinforcing phase, and silicic acid Yttrium is uniformly filled in the voids of the three-dimensional silicon carbide fiber preform, and the crystal phase is Y 2 SiO 5 , In this implementation, the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 10.8%.

[0060] In this embodiment, the three-dimensional silicon carbide fiber preform is a three-dimensional four-way braided three-dimensional silicon carbide fiber preform, and the volume fraction of fibers in the three-dimensional silicon carbide fiber preform is 51%.

[0061] In this example, the bending strength of the three-dimensional silicon carbide fiber ...

Embodiment 3

[0072] A three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material of the present invention comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, wherein the yttrium silicate is a matrix, the three-dimensional silicon carbide fiber preform is a reinforcing phase, and silicic acid Yttrium is uniformly filled in the voids of the three-dimensional silicon carbide fiber preform, and the crystal phase is Y 2 Si 2 o 7 and Y 2 SiO 5 Composed of mixed crystal phases, where, Y 2 Si 2 o 7 and Y 2 SiO 5 The molar ratio is 1:1. In this implementation, the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 15.2%.

[0073] In this embodiment, the three-dimensional silicon carbide fiber preform is a three-dimensional silicon carbide fiber preform with a two-dimensional semi-woven structure, and the volume fraction of fibers in the three-dimensional silicon c...

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Abstract

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional silicon carbide fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 10%-16%. A preparation method comprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5)repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree, high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation methodis high, and the compact degree and mechanical properties 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 matrix composite materials, in particular to a three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material and a preparation method thereof. Background technique [0002] Yttrium silicate is made from Y 2 o 3 and SiO 2 A material with a polycrystalline phase structure composed of three main crystal phase structures, namely Y 2 SiO 5 , Y 2 Si 2 o 7 and Y 4 Si 3 o 12 , of which the first two are the most common. In addition to being used as an optical matrix material and a dielectric material, yttrium silicate is also an excellent high-temperature resistant ceramic material, and its main crystal form Y 2 SiO 5 , Y 2 Si 2 o 7 and Y 4 Si 3 o 12 The melting points are 1980°C, 1775°C and 1950°C, respectively. While having a high melting point, yttrium silicate also has a series of excellent physical and che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/16C04B35/80C04B35/624
Inventor 马青松曾宽宏
Owner NAT UNIV OF DEFENSE TECH
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