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Ceramic thermal barrier coating layer and method for quickly preparing coating layer through in-situ reaction

A thermal barrier coating and in-situ reaction technology, which is applied in the field of ceramic thermal barrier coating and in-situ reaction rapid preparation coating, can solve the problems of thermal physical properties and mechanical properties of the coating, and achieve excellent thermal insulation performance and Thermal shock resistance, simple preparation process, and short preparation cycle

Pending Publication Date: 2018-07-06
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the original powder is a nanopowder, the prepared coating is likely to exceed the nanostructure, resulting in a decrease in the thermophysical and mechanical properties of the coating.

Method used

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  • Ceramic thermal barrier coating layer and method for quickly preparing coating layer through in-situ reaction
  • Ceramic thermal barrier coating layer and method for quickly preparing coating layer through in-situ reaction
  • Ceramic thermal barrier coating layer and method for quickly preparing coating layer through in-situ reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: prepare La 2 (Ce 0.9 Zr 0.1 ) 2 o 7 coating

[0036] La(NO with a purity of 99.99% 3 ) 3 ·6H 2 O, Ce(CH 3 COO) 3 , ZrOCl 2 Dissolve in deionized water according to the stoichiometric ratio of La ion: Ce ion: Zr ion=1:0.9:0.1 to prepare a precursor solution, and the molar concentration of La ion in the solution is 1.0mol / L. And add 99.99% pure urea (CO(NH 2 ) 2 ), the addition amount is 10mol.% of the La ion content.

[0037] The precursor solution was stirred for 5 hours with a magnetic stirrer, and then the pH value of the precursor solution was adjusted to 5 with 0.3 mol / L ammonia water, and the ammonia water titration rate was controlled at 0.5 ml / min, and stirred for 5 hours with a magnetic stirrer.

[0038] The prepared precursor solution is sent into the two-fluid atomizing nozzle with a pressure feeding device, and the precursor liquid droplets atomized by the atomizing nozzle are sent into the plasma flame stream. The atomized droplet...

Embodiment 2

[0040] Embodiment 2: prepare La 2 (Ce 0.8 Ti 0.2 ) 2 o 7 coating

[0041] La(CH with a purity of 99.99% 3 COO) 3 , Ce(NO 3 ) 3 ·6H 2 O, Ti(CH 3 COO) 4 Dissolve in deionized water according to the stoichiometric ratio of La ion: Ce ion: Ti ion=1:0.8:0.2 to prepare a precursor solution, and the molar concentration of La ion in the solution is 0.8mol / L. And add ammonium acetate with a purity of 99.99% (CH 3 COONH 4 ), the addition is 40mol.% of the La ion content.

[0042] The precursor solution was stirred for 3 hours with a magnetic stirrer, and then the pH value of the precursor solution was adjusted to 5 with 0.3 mol / L ammonia water, and the titration rate of ammonia water was controlled at 0.5 ml / min, and stirred for 6 hours with a magnetic stirrer.

[0043] The prepared precursor solution is sent into the two-fluid atomizing nozzle with a pressure feeding device, and the precursor liquid droplets atomized by the atomizing nozzle are sent into the plasma flame ...

Embodiment 3

[0045] Embodiment 3: prepare La 2 (Ce 0.7 f 0.3 ) 2 o 7 coating

[0046] La(NO with a purity of 99.99% 3 ) 3 ·6H 2 O, Ce(CH 3 COO) 3 , HfOCl 2 Dissolve in deionized water according to the stoichiometric ratio of La ion: Ce ion: Hf ion=1:0.7:0.3 to prepare a precursor solution, and the molar concentration of La ion in the solution is 1.5mol / L. And add 99.99% pure urea (CO(NH 2 ) 2 ), the addition amount is 30mol.% of the La ion content.

[0047] Stir the precursor solution for 2 hours with a magnetic stirrer, then adjust the pH of the precursor solution to 5 with 0.3 mol / L ammonia water, control the titration rate of ammonia water to 0.5 ml / min, and stir with a magnetic stirrer for 6 hours.

[0048] The prepared precursor solution is sent into the two-fluid atomizing nozzle with a pressure feeding device, and the precursor liquid droplets atomized by the atomizing nozzle are sent into the plasma flame stream. The atomized droplets of the precursor are deposited on...

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Abstract

The invention relates to a ceramic thermal barrier coating layer and a method for quickly preparing the coating layer through in-situ reaction, and belongs to the field of preparation and applicationof inorganic nonmetal materials. The component of the coating layer is La2(Ce1-xMx)2O7+delta, and M is one or a combination of two of Ti, Zr, Hf, Ta, Nb, Mo and W, wherein x is more than or equal to 0.10 and less than or equal to 0.30, and delta is more than or equal to 0 and less than or equal to 0.6. The coating layer is prepared by uniformly mixing soluble lanthanum salt, soluble cerium salt and soluble M salt through a plasma spraying method. The preparation method has the characteristics of simplicity, efficiency, low cost, flexible adjustment and control of the component of the coating layer, and is suitable for industrial production. The coating layer prepared through solution plasma spraying is excellent in heat isolation performance and thermal shock resistance; and the coating layer is stable in structure and long in service life and can be applied to high-temperature protection of a high-temperature alloy such as a marine engine, an aero-engine, a ground gas turbine and a rocket engine or a hot-end component of a refractory alloy.

Description

technical field [0001] The invention relates to a ceramic thermal barrier coating and a method for rapidly preparing the coating by in-situ reaction, in particular to a ceramic thermal barrier La 2 (Ce 1-x m x ) 2 o 7+δ Coating and plasma spraying to prepare La 2 (Ce 1-x m x ) 2 o 7+δ The coating method belongs to the field of preparation and application of inorganic non-metallic materials. Background technique [0002] Ceramic thermal barrier coating is one of the most advanced high-temperature protective coatings at present. It has good high-temperature chemical stability, erosion resistance and heat insulation. It can effectively alleviate the high-temperature oxidation and corrosion of metal matrix materials, and can Reducing the working temperature of the surface of the metal substrate can not only improve the economy of aero turbine engines or ground gas turbines, but also greatly extend their service life. Since its appearance in the early 1970s, it has been ...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622
CPCC04B35/50C04B35/62218C04B2235/3246C04B2235/9607
Inventor 马文黄威孟祥锋李恩博董红英白玉陈伟东
Owner INNER MONGOLIA UNIV OF TECH
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