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Preparation method of CAMS erosion-resistant thermal barrier coating with double-layer structure

A technology of thermal barrier coating and double-layer structure, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve problems such as failure and peeling, and prevent uneven coating thickness and coating The effect of uniform thickness and excellent thermal shock resistance

Pending Publication Date: 2021-10-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intersecting network cracks effectively block the penetration of CAMS, and solve the problems of spalling and failure of thermal barrier coatings caused by CMAS erosion during service

Method used

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  • Preparation method of CAMS erosion-resistant thermal barrier coating with double-layer structure
  • Preparation method of CAMS erosion-resistant thermal barrier coating with double-layer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) A NiCrAlY adhesive layer with a thickness of 50 μm was sprayed on the base material by plasma spraying, and then a YSZ ceramic layer with a thickness of 150 μm was sprayed on the adhesive layer by plasma spraying.

[0033] (2) The ceramic layer is laser remelted with a pulsed laser. The parameters of the laser are pulse width 15ns, power 20w, scanning speed 100mm / s, spot diameter 50μm, and line spacing 0.01mm.

[0034] (3) Weigh Al(NO 3 ) 3 9H 2 O and Y (NO 3 ) 3 ·6H 2 O powder was dissolved in water and stirred for 1h to form a mixed solution; 1mol / L NH 3 ·H 2 Slowly drop the O solution into the mixed solution to adjust the pH to 9-10, wash the obtained white precipitate with deionized water several times; Add 2mol / L HNO 3 Adjust the pH of the solution to 2, and hydrolyze at 75°C for 2 hours to form a sol;

[0035] (4) Reflux aging the sol at 40° C. for 12 hours; apply the sol to the adhesive layer with a homogenizer at a speed of 3000 r / min to obtain a co...

Embodiment 2

[0039] (1) A NiCrAlY adhesive layer with a thickness of 75 μm was sprayed on the base material by plasma spraying, and then a GDZ ceramic layer with a thickness of 200 μm was sprayed on the adhesive layer by plasma spraying.

[0040] (2) The ceramic layer is laser remelted with a pulsed laser. The parameters of the laser are pulse width 15ns, power 25w, scanning speed 100mm / s, spot diameter 50μm, and line spacing 0.01mm.

[0041] (3) Weigh Al(NO 3 ) 3 9H 2 O and Y (NO 3 ) 3 ·6H 2 O powder was dissolved in water and stirred for 1h to form a mixed solution; 1mol / L NH 3 ·H 2 Slowly drop the O solution into the mixed solution to adjust the pH to 9-10, wash the obtained white precipitate with deionized water several times; Add 2mol / L HNO 3 Adjust the pH of the solution, and hydrolyze it at 75°C for 2 hours to form a sol;

[0042] (4) Reflux and age the sol at 40° C. for 18 hours; apply the sol to the adhesive layer with a homogenizer at a speed of 2500 r / min to obtain a coat...

Embodiment 3

[0046] (1) A NiCrAlY adhesive layer with a thickness of 50 μm was sprayed on the base material by plasma spraying, and then a GDZ ceramic layer with a thickness of 250 μm was sprayed on the adhesive layer by plasma spraying.

[0047] (2) The ceramic layer is laser remelted with a pulsed laser. The parameters of the laser are pulse width 15ns, power 30w, scanning speed 50mm / s, spot diameter 50μm, and line spacing 0.01mm.

[0048] (3) Weigh Al(NO 3 ) 3 9H 2 O and Y (NO 3 ) 3 ·6H 2 O powder was dissolved in water and stirred for 1h to form a mixed solution; 1mol / L NH 3 ·H 2 Slowly drop the O solution into the mixed solution to adjust the pH to 9-10, wash the obtained white precipitate with deionized water several times; Add 2mol / L HNO 3 Adjust the pH of the solution, and hydrolyze it at 75°C for 2 hours to form a sol;

[0049] (4) Reflux aging the sol at 40°C for 24 hours; apply the sol to the adhesive layer with a homogenizer at a speed of 2000r / min to obtain a coating ...

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Abstract

The invention belongs to the technical field of coatings, and particularly relates to a preparation method of a CAMS-corrosion-resistant thermal barrier coating of a double-layer structure. The method comprises the following steps: performing laser remelting on a ceramic layer by using a laser to obtain a microcrack layer formed by remelting and modifying the ceramic layer; and coating the micro-crack layer modified by the ceramic with a sol by using a spin coater to obtain a coating layer, and carrying out laser remelting on the coating layer by using a laser to completely change the coating layer into a sol remelting layer, thereby finally obtaining the double-layer CMAS erosion resistant thermal barrier coating structure. CAMS permeation is effectively blocked through the mutually-crossed net-shaped cracks, and the problems of peeling, failure and the like caused by CMAS erosion in the service process of the thermal barrier coating are solved.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a preparation method of a CAMS erosion-resistant double-layer structure thermal barrier coating. Background technique [0002] As the thrust-to-weight ratio of aero turbine engines continues to increase, the gas inlet temperature has exceeded 1650 °C and is still rising rapidly, while the temperature limit that nickel-based single crystal superalloys can withstand is only 1150 °C. Thermal barrier coating technology is to cover a layer of high-temperature-resistant and heat-insulating ceramic material on the surface of the alloy to reduce the surface temperature of the blade and make it stable in service. But during the flight, the dust in the air will be sucked into the engine, the main components of the dust are CaO, MgO, Al 2 o 3 and SiO 2 (CMAS), it will be deposited on the surface of the blade and penetrate into the interior of the ceramic layer at high temperature to cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/073C23C4/10C23C4/134C23C4/18C23C24/10
CPCC23C28/322C23C28/3215C23C28/3455C23C4/134C23C4/073C23C4/18C23C4/10C23C24/10
Inventor 戴峰泽周阳叶飞花银群叶云霞蔡杰
Owner JIANGSU UNIV