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

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...

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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

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