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Compact ferroelastic dual rare earth tantalate solid solution high-temperature ceramic and preparation method thereof

A high-temperature ceramic and double rare earth technology, applied in the field of high-temperature thermal barrier coating materials, can solve the problems of low operating temperature, low thermal expansion coefficient, and high thermal conductivity of YSZ, and achieve high-temperature phase stability, high purity, and improved fracture toughness Effect

Inactive Publication Date: 2019-06-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently widely used are mainly yttria stabilized zirconia (YSZ) and rare earth zirconates (RE 2 Zr 2 o 7 ), etc., but there are certain limitations: YSZ has low operating temperature (≦1200°C), relatively high thermal conductivity (2.5W.m -1 k -1 ); while RE 2 Zr 2 o 7 Then there is the problem of low thermal expansion coefficient
As the key performance indicators of thermal barrier coatings, thermal conductivity and thermal expansion coefficient are still lacking in rare earth tantalate (RETaO 4 ) Preparation of dense block samples, ferroelasticity and thermodynamic properties modification, etc.

Method used

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  • Compact ferroelastic dual rare earth tantalate solid solution high-temperature ceramic and preparation method thereof
  • Compact ferroelastic dual rare earth tantalate solid solution high-temperature ceramic and preparation method thereof
  • Compact ferroelastic dual rare earth tantalate solid solution high-temperature ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing dense ferroelastic double rare earth tantalate solid solution high-temperature ceramics, the specific steps are:

[0027] (1) According to double rare earth tantalate (Y 1-x Dy x )TaO 4 (x=1 / 6) The stoichiometric ratio of solid solution ceramics weighs the rare earth oxide (Y 2 o 3 , Dy 2 o 3 ) and tantalum pentoxide (Ta 2 o 5 ), and then the materials rare earth oxide and tantalum pentoxide were ball milled and mixed to obtain mixed powder A. The mass ratio of material to balls was 4:1, the milling speed was 300 r / min, and the milling time was 24 h.

[0028] (2) The mixed powder A in step (1) was dried by rotary evaporation, the evaporation temperature was 50 ̊C, and the evaporation time was 1h.

[0029] (3) Pass the mixed powder A obtained in step (2) through a 300-mesh sieve and place it in a mold to compact it into a rough embryo, with a pressure of 6 MPa and a holding time of 3 min.

[0030] (4) Press the rough embryo obtained in st...

Embodiment 2

[0034] A method for preparing dense ferroelastic double rare earth tantalate solid solution high-temperature ceramics, the specific steps are:

[0035] (1) According to double rare earth tantalate (Y 1-x Dy x )TaO 4 (x=2 / 6) The stoichiometric ratio of solid solution ceramics weighs the rare earth oxide (Y 2 o 3 , Dy 2 o 3 ) and tantalum pentoxide (Ta 2 o 5 ), and then the materials rare earth oxide and tantalum pentoxide were ball milled and mixed to obtain mixed powder A. The mass ratio of material to balls was 4:1, the milling speed was 300 r / min, and the milling time was 24 h.

[0036] (2) The mixed powder A in step (1) was dried by rotary evaporation, the evaporation temperature was 50 ̊C, and the evaporation time was 1h.

[0037] (3) Pass the mixed powder A obtained in step (2) through a 300-mesh sieve and place it in a mold to compact it into a rough embryo, with a pressure of 6 MPa and a holding time of 3 min.

[0038] (4) Press the rough embryo obtained in st...

Embodiment 3

[0042] A method for preparing dense ferroelastic double rare earth tantalate solid solution high-temperature ceramics, the specific steps are:

[0043] (1) According to double rare earth tantalate (Y 1-x Dy x )TaO 4 (x=3 / 6) The stoichiometric ratio of solid solution ceramics weighs the rare earth oxide (Y 2 o 3 , Dy 2 o 3 ) and tantalum pentoxide (Ta 2 o 5 ), and then the materials rare earth oxide and tantalum pentoxide were ball milled and mixed to obtain mixed powder A. The mass ratio of material to balls was 4:1, the milling speed was 300 r / min, and the milling time was 24 h.

[0044] (2) The mixed powder A in step (1) was dried by rotary evaporation, the evaporation temperature was 50 ̊C, and the evaporation time was 1h.

[0045] (3) Pass the mixed powder A obtained in step (2) through a 300-mesh sieve and place it in a mold to compact it into a rough embryo, with a pressure of 6 MPa and a holding time of 3 min.

[0046] (4) Press the rough embryo obtained in st...

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Abstract

The invention discloses compact ferroelastic dual rare earth tantalate solid solution high-temperature ceramic and a preparation method thereof, and belongs to the technical field of high temperatureresistant material of thermal barrier ceramic coating. The structural formula is (Y1-xDyx)TaO4 (x=0.1-0.9). Previously dried rare earth oxides (Y2O3, Dy2O3) and tantalum pentoxide (Ta2O5) are weighedaccording to the stoichiometric ratio required. Then, the materials are ball milled with ethanol as a solvent to obtain mixed powder A; the mixed powder A is sieved and compacted in a mold, and then ablank undergoes isostatic cool pressing to prepare a compact blank; and finally, the compact blank undergoes pressureless sintering to obtain the compact dual rare earth tantalate solid solution high-temperature ceramic. The dual rare earth tantalate solid solution high-temperature ceramic prepared by the method has characteristics of high process purity, low impurity content, high compactness, uniform grain size, low heat conductivity, large coefficient of thermal expansion, good toughness and the like.

Description

technical field [0001] The invention relates to a dense ferroelastic double rare earth tantalate solid solution high-temperature ceramic and a preparation method thereof, belonging to the technical field of high-temperature thermal barrier coating materials. Background technique [0002] Thermal barrier coatings are mainly used in the aero-engine industry. They have the advantages of low thermal conductivity, high thermal expansion coefficient, anti-sintering, and good high-temperature stability. function of the component. Currently widely used are mainly yttria stabilized zirconia (YSZ) and rare earth zirconates (RE 2 Zr 2 o 7 ), etc., but there are certain limitations: YSZ has low operating temperature (≦1200°C), relatively high thermal conductivity (2.5W.m -1 k -1 ); while RE 2 Zr 2 o 7 Then there is a problem that the coefficient of thermal expansion is low. In order to meet the higher thrust-to-weight ratio requirements of future aero-engines, it is urgent to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/495
Inventor 冯晶吴鹏宋鹏葛振华
Owner KUNMING UNIV OF SCI & TECH
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