Method for preparing nano BaLn2Ti3O10 heat-barrier coating ceramic layer material

A technology for thermal barrier coatings and ceramic layers, which is applied in the field of preparing nano-BaLn2Ti3O10 thermal barrier coating ceramic layer materials, can solve the problems of affecting the service life of coatings and reducing the thermal shock performance of coatings, and achieve low density, high strength and Hardness, Effect of High Thermal Expansion Coefficient

Inactive Publication Date: 2007-05-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long-term service of TBCs at high temperature, high-temperature gas invades the bonding bottom layer through the pores and cracks in the coating, forming brittle oxides in the bonding bottom layer, which reduces the thermal shock performance of the coating and affects the service life of the coating.

Method used

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  • Method for preparing nano BaLn2Ti3O10 heat-barrier coating ceramic layer material
  • Method for preparing nano BaLn2Ti3O10 heat-barrier coating ceramic layer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: take barium nitrate, titanium nitrate and lanthanum nitrate as raw material

[0034] The first step: take barium nitrate, titanium nitrate and lanthanum nitrate in a molar ratio of 1:3:2, and dissolve them in deionized water to form a 6mol / L nitrate solution (calculated in terms of total metal ions);

[0035] Second step: adding citric acid in the above-mentioned nitrate solution as a complexing agent to form a citric acid complex solution, the mol ratio of the citric acid to the metal ion in the nitrate solution is 1.3:1;

[0036] The third step: adding polyethylene glycol (molecular weight 4000) to the citric acid complex as a crosslinking agent to obtain a sol precursor, adding 1g of polyethylene glycol in every 100ml of the citric acid complex;

[0037] Step 4: Stir the above sol precursor at room temperature for about 20 minutes to make it a transparent sol;

[0038] Step 5: Evaporate the solvent at 80°C for 150 minutes to obtain a viscous gel, then ...

Embodiment 2

[0041] Embodiment 2: take barium nitrate, titanium nitrate and samarium nitrate as raw material

[0042] The first step: take barium nitrate, titanium nitrate and samarium nitrate in a molar ratio of 1:3:2, dissolve them in deionized water to form a nitrate solution of about 8mol / L (calculated based on the total amount of metal ions);

[0043] Second step: adding citric acid in the above-mentioned nitrate solution as a complexing agent to form a citric acid complex solution, the mol ratio of the citric acid to the metal ion in the nitrate solution is 2:1;

[0044] The third step: add polyethylene glycol (molecular weight 20000) as cross-linking agent, add 0.5g polyethylene glycol per 100ml solution;

[0045] Step 4: Stir the above solution at room temperature for about 30 minutes to make it a transparent sol;

[0046] Step 5: Evaporate the solvent at 70°C for 180 minutes to obtain a viscous gel, then heat the gel at 100°C for 240 minutes to obtain a dry gel;

[0047] Step 6:...

Embodiment 3

[0048] Embodiment 3: take barium nitrate, titanium nitrate and neodymium nitrate as raw material

[0049] Step 1: Take barium nitrate, titanium nitrate and neodymium nitrate in a molar ratio of 1:3:2, and dissolve them in deionized water to form a nitrate solution of about 3 mol / L (calculated based on the total amount of metal ions);

[0050] Second step: adding citric acid in the above-mentioned nitrate solution as a complexing agent to form a citric acid complex solution, the mol ratio of the citric acid to the metal ion in the nitrate solution is 1.5:1;

[0051] The third step: adding polyethylene glycol (molecular weight 4000) to the above-mentioned citric acid complex solution as a crosslinking agent to form a sol precursor, adding 0.8g polyethylene glycol to every 100ml solution;

[0052] Step 4: Stir the above solution at room temperature for about 15 minutes to make it a transparent sol;

[0053] Step 5: Evaporate the solvent at 75°C for 160 minutes to obtain a viscou...

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Abstract

The invention disclosed a way to prepare nanometer BaLn2Ti3O10 ceramic layer material which can be used as heat-proof smear layer and the invention adopts a melting gel and coagulating gel method. The products in the invention are uniform globular and the size of the grain is less than 100nm. The ceramic layer material has lamellar calcium and titanium structure and the ingredient of the material is BaLn2Ti3O10, of which Ln stands for one kind or two / three kinds of La, Sm and Nd. The material of the invention has lower heat conductivity and higher coefficient of thermal expansion compared to the traditional zirconium oxide which is solidified by 7-8% yttrium oxide. The material can be used as the ceramic layer material for heat-proof smear layer; the using temperature interval is from room temperature to 1200DEG C.

Description

technical field [0001] The invention relates to a method for preparing ceramic layer materials in thermal barrier coatings, more particularly, a method for preparing nanometer BaLn 2 Ti 3 o 10 Method for thermal barrier coating ceramic layer materials. Background technique [0002] The development trend of modern aviation gas turbine engines is high thrust-to-weight ratio, high efficiency, low fuel consumption and long life. In order to achieve these goals, the main measure adopted is to increase the inlet temperature of the turbine engine, which puts forward higher requirements for the high temperature resistance of the high temperature components of the engine. Limited by the melting point of high-temperature alloys, it is very difficult to further increase the working temperature of pure alloy high-temperature components. Therefore, high-temperature thermal barrier coatings (TBCs) have become an indispensable and important part of aero-engine manufacturing technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 车平宫声凯徐惠彬郭洪波郭林
Owner BEIHANG UNIV
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