Three-dimensional silicon carbide fiber preform reinforced yttrium oxide-zirconium oxide multiphase ceramic composite material and preparation method thereof

Abstract

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium oxide-zirconium oxide multiphase ceramic composite material and a preparation method thereof. The compositematerial comprises a three-dimensional silicon carbide preform and an Y2O3-ZrO2 multiphase ceramic, in the Y2O3-ZrO2 multiphase ceramic, molar content of ZrO2 is 5-95%, the Y2O3-ZrO2 multiphase ceramic is uniformly filled in pores of the three-dimensional silicon carbide fiber preform, and porosity of the composite material is 9-16%. The preparation method comprises the following steps: (1) preparing Y2O3-ZrO2 composite sol; (2) impregnating; (3) drying; (4) carrying out heat treatment; and (5) repeating the impregnation-drying-heat treatment process in the steps (2)-(4). The composite material disclosed by the invention has the advantages of low porosity, high density, high temperature resistance, oxidation resistance and good mechanical properties, the preparation method has high preparation efficiency, and the density and mechanical properties of the composite material are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of high temperature-resistant fiber-reinforced ceramic matrix composite materials, and in particular relates to a three-dimensional silicon carbide fiber preform reinforced yttrium oxide-zirconia (Y 2 o 3 -ZrO 2 ) Composite ceramic composite material and its preparation method. Background technique [0002] Y 2 o 3 -ZrO 2 Composite ceramics with Y 2 o 3 and ZrO 2 It has the advantages of high temperature resistance, oxidation resistance, creep resistance and corrosion resistance. At the same time, Y 2 o 3 The introduction of ZrO can inhibit 2 Therefore, it is an excellent high temperature resistant ceramic material, and has been studied more as a thermal barrier coating material. As a monolithic ceramic, Y 2 o 3 -ZrO 2 The fracture toughness of composite ceramics is low, in most cases it is 2~4MPa m 1 / 2 . Such a low fracture toughness results in the monomer Y 2 o 3 -ZrO 2 Composite ceramic...

AI Technical Summary

Problems solved by technology

And for fiber reinforced Y 2 o 3 -ZrO 2 Multiphase ceramic composites are currently suitable for depositing Y 2 o 3 and ZrO 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, no three-dimensional silicon carbide fiber preform reinforced Y has been found by liquid phase method. 2 o 3 -ZrO 2 Research Report on Multiphase Ceramic Composites

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