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High-temperature-resistant CMAS-corrosion-resistant rare earth silicate ceramic and preparation method thereof

A rare earth silicate and rare earth monosilicate technology, applied in the direction of high-efficiency propulsion technology, sustainable transportation, climate sustainability, etc., can solve the problems of limiting the application of EBCs, unable to meet the use requirements, poor corrosion ability, etc. The effect of improving the corrosion resistance of high temperature CMAS, improving the corrosion resistance of high temperature CMAS, and low cost

Active Publication Date: 2022-08-05
SHENYANG POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is still disastrous for EBCs that are only tens to hundreds of microns thick, and the poor corrosion ability limits the application of EBCs at high temperatures
Therefore, none of the existing coatings can meet the requirements of high-temperature extreme environments.

Method used

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  • High-temperature-resistant CMAS-corrosion-resistant rare earth silicate ceramic and preparation method thereof
  • High-temperature-resistant CMAS-corrosion-resistant rare earth silicate ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, Y and Yb elements are selected to prepare two-component high-entropy (2RE) 1 / 2 ) 2 Si 2 O 7 / (2RE 1 / 2 ) 2 SiO 5 Multiphase ceramics, including the following steps:

[0026] Step 1, preparation of high-entropy rare earth mono- and di-silicate powder: the RE 2 O 3 (RE is rare earth element), SiO 2 Mix in 1:1 and 1:2 molar ratios, respectively. The mixed powder was wet ball milled in a ball mill for 24 h, and then the obtained slurry was placed in an oven, dried at 80 °C for 10 h, and then the dried powder was calcined at 1450 °C for 2 h, and then ball-milled for 10 h. , respectively, to synthesize single-phase high-entropy rare earth monosilicate (2RE 1 / 2 ) 2 SiO 5 Powder and single-phase high-entropy rare earth disilicate (2RE) 1 / 2 ) 2 Si 2 O 7 powder.

[0027] Step 2, (2RE 1 / 2 ) 2 Si 2 O 7 / (2RE 1 / 2 ) 2 SiO 5 Preparation of multi-phase powder: the single-phase powder prepared in step 1, press (2RE 1 / 2 ) 2 SiO 5 :(2RE 1 / 2 )...

Embodiment 2

[0031] In this embodiment, Y, Yb, Er elements are selected to prepare three-component high-entropy (3RE 1 / 3 ) 2 Si 2 O 7 / (3RE 1 / 3 ) 2 SiO 5 Multiphase ceramics, including the following steps:

[0032] Step 1, preparation of high-entropy rare earth mono- and di-silicate powder: the RE 2 O 3 (RE is rare earth element), SiO 2 Mix in 1:1 and 1:2 molar ratios, respectively. The mixed powder was wet ball milled and mixed in a ball mill for 24 h, and then the obtained slurry was placed in an oven, dried at 80 °C for 10 h, and then the dried powder was kept at 1500 °C for 2 h, and then ball-milled for 10 h. , respectively, to synthesize single-phase high-entropy rare earth monosilicate (3RE 1 / 3 ) 2 SiO 5 Powder and single-phase high-entropy rare earth disilicates (3RE 1 / 3 ) 2 Si 2 O 7 powder.

[0033] Step 2, (3RE 1 / 3 ) 2 Si 2 O 7 / (3RE 1 / 3 ) 2 SiO 5 Preparation of multi-phase powder: the single-phase powder prepared in step 1, press (3RE 1 / 3 ) 2 SiO 5 :(3R...

Embodiment 3

[0037] combine Figure 1-2 , the present embodiment selects Y, Yb, Er, Sc elements to prepare four-component high-entropy (4RE 1 / 4 ) 2 Si 2 O 7 / (4RE 1 / 4 ) 2 SiO 5 Multiphase ceramics, including the following steps:

[0038] Step 1, preparation of high-entropy rare earth mono- and di-silicate powder: the RE 2 O 3 (RE is rare earth element), SiO 2 Mix in 1:1 and 1:2 molar ratios, respectively. The mixed powder was wet ball milled and mixed in a ball mill for 24 h, and then the obtained slurry was placed in an oven, dried at 80 °C for 10 h, and then the dried powder was kept at 1500 °C for 2 h, and then ball-milled for 10 h. , respectively, to synthesize single-phase high-entropy rare earth monosilicate (4RE 1 / 4 ) 2 SiO 5 Powder and single-phase high-entropy rare earth disilicate (4RE) 1 / 4 ) 2 Si 2 O 7 powder.

[0039] Step 2, (4RE 1 / 4 ) 2 Si 2 O 7 / (4RE 1 / 4 ) 2 SiO 5 Preparation of multi-phase powder: the single-phase powder prepared in step 1, press (4...

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PUM

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Abstract

The invention relates to high-temperature-resistant CMAS-corrosion-resistant rare earth silicate ceramic and a preparation method thereof. The ceramic is of a composite ceramic structure compounded by high-entropy rare earth monosilicate and high-entropy rare earth disilicate. The preparation method comprises the following steps: respectively synthesizing RE2O3 and SiO2 into single-phase (xRE1 / x) 2SiO5 powder and single-phase (xRE1 / x) 2Si2O7 powder through a solid-phase reaction method, then compounding the single-phase (xRE1 / x) 2SiO5 powder and the single-phase (xRE1 / x) 2Si2O7 powder according to a certain proportion to form (xRE1 / x) 2SiO5 / (xRE1 / x) 2Si2O7 complex-phase powder, tabletting the powder, and carrying out pressureless sintering to form (xRE1 / x) 2SiO5 / (xRE1 / x) 2Si2O7 complex-phase ceramic blocks; the high-entropy rare earth silicate ceramic with the structure has excellent performances such as good high-temperature CMAS corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental barrier coating materials, and relates to a structure design and preparation method of a multiphase ceramic composited with high-entropy rare-earth monosilicate and high-entropy rare-earth disilicate. Background technique [0002] SiC ceramic matrix composites (CMCs) are composite materials reinforced with SiC ceramics and C or SiC fibers. SiC-CMCs have the characteristics of low density, high temperature resistance, excellent mechanical properties, and anti-oxidation. When they are applied to aero-engines such as combustion chambers, turbines, etc., they can achieve the effects of structural weight reduction, improved combustion efficiency, and high thrust-to-weight ratio development. Therefore, SiC-CMCs have received extensive attention from researchers. [0003] In a dry oxidizing atmosphere, SiC-CMCs can form dense and anti-oxidative SiO on the surface 2 The protective l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/505C04B35/622C04B35/63
CPCC04B35/50C04B35/505C04B35/622C04B35/6303C04B2235/3225C04B2235/3224C04B2235/3418C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/9669Y02T50/60
Inventor 王超何昱萱李刘媛吴玉胜王赫王占杰
Owner SHENYANG POLYTECHNIC UNIV
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