High-temperature-resistant anti-oxidation anti-abrasion low-heat-expansion-coefficient aluminum tantalite ceramic material as well as preparation method and application thereof

Abstract

The invention discloses a high-temperature-resistant anti-oxidation anti-abrasion low-heat-expansion-coefficient aluminum tantalite ceramic material as well as a preparation method and application thereof. The high-temperature-resistant anti-oxidation anti-abrasion low-heat-expansion-coefficient aluminum tantalite ceramic material is prepared from aluminum oxide and tantalum pentoxide as raw materials; the compactness of the high-temperature-resistant anti-oxidation anti-abrasion low-heat-expansion-coefficient aluminum tantalite material is 98 percent; the heat diffusion coefficient is 0.6 to2.4mm<2> / s (25 to 900 DEG C); the heat conduction rate is 2.2 to 6.2W.K<-1>(25 to 900 DEG C); the hardness is 9.0 GPa; the phase change cannot occur at the temperature of 25 to 1200 DEG C. The preparation method comprises the steps of pretreatment and sintering. The application is the application of the high-temperature-resistant anti-oxidation anti-abrasion low-heat-expansion-coefficient aluminumtantalite ceramic material to the preparation of a coating with thermal and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an aluminum tantalate ceramic material with high temperature resistance, oxidation resistance, wear resistance and low thermal expansion coefficient, a preparation method and application thereof. Background technique [0002] Environmental coatings are mainly used in the aero-engine industry. They have the advantages of low thermal conductivity, low thermal expansion coefficient, anti-sintering, and good high-temperature stability. They mainly serve to prevent thermal corrosion, reduce thermal mismatch between the ceramic layer and the substrate (SiC), It can effectively resist the impact of particles and protect the parts of aero-engine high-temperature areas. Currently widely used are mainly rare earth silicates (RE 2 Si 2 o 7 ), etc., but there are certain deficiencies: RE 2 Si 2 o 7 The coefficient of thermal expansion is high, much higher than that of the...

AI Technical Summary

Problems solved by technology

Currently widely used are mainly rare earth silicates (RE 2 Si 2 o 7 ), etc., but there are certain deficiencies: RE 2 Si 2 o 7 High coefficient of thermal expansion, much higher than the base material to be protected

Many oxide ceramics with excellent thermal properties have been discovered, such as rare earth cerates (RE 2 Zr 2 o 7 ), rare earth phosphate (REPO 4 ) and rare earth zirconates (RE 2 Zr 2 o 7 ), etc., but their coefficients of thermal expansion are higher about 8~10×10 -6 K -1 (1200 ℃), which is much higher than the thermal expansion coefficient of the SiC material to be protected by 5~6×10 -6 K -1 (1200 ℃), the ratio matching of thermal expansion coefficient will generate huge thermal stress and lead to coating failure

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