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Environmental barrier coating and coating method and application thereof

An environmental barrier and coating technology, applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problems of further improvement of service time and low maximum service temperature, and achieve long service life and improved service life. Use performance and life, good service performance

Active Publication Date: 2019-09-27
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the second-generation environmental barrier coating is that its maximum service temperature is low
At present, the service performance and service time of these rare earth silicate environmental barrier coatings need to be further improved

Method used

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  • Environmental barrier coating and coating method and application thereof
  • Environmental barrier coating and coating method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The environmental barrier coating coating method provided in this embodiment has the following steps:

[0070] Using atmospheric plasma spraying to prepare Si, mullite, and Yb on the surface of silicon carbide-based composites 2 SiO 5 Coating, the thickness of the coating is 50μm, 50μm, 80μm; magnetron sputtering is used in Yb 2 SiO 5 An aluminum film layer with a thickness of 3μm is prepared on the coating surface. The conditions of magnetron sputtering are: magnetron target current 3A, bias voltage 150V; heat treatment of the environmental barrier coating deposited with aluminum film layer, the conditions of the heat treatment: 800 Keep temperature at ℃ for 2h, keep at 1300℃ for 24h, heating rate is 5℃ / min, vacuum oxygen partial pressure is less than 2×10 -3 Pa. After cooling to room temperature, an environmental barrier coating is obtained on the surface of the substrate.

Embodiment 2

[0072] The environmental barrier coating coating method provided in this embodiment has the following steps:

[0073] Plasma spraying-physical vapor deposition is used to prepare Si, mullite, and Yb on the surface of silicon carbide-based composites 2 SiO 5 Coating, the thickness of the coating is 50μm, 50μm, 80μm; magnetron sputtering is used in Yb 2 SiO 5 An aluminum film layer with a thickness of 3μm is prepared on the coating surface. The conditions of magnetron sputtering are: magnetron target current 3A, bias voltage 150V; heat treatment of the environmental barrier coating deposited with aluminum film layer, the conditions of the heat treatment: 700 Keep temperature at ℃ for 2h, keep at 1300℃ for 24h, increase / decrease rate is 10℃ / min, vacuum oxygen partial pressure is less than 2×10 -3 Pa. After cooling to room temperature, an environmental barrier coating is obtained on the surface of the substrate.

Embodiment 3

[0075] The environmental barrier coating coating method provided in this embodiment has the following steps:

[0076] Plasma spraying-physical vapor deposition is used to prepare Si, mullite, and Yb on the surface of silicon carbide-based composites 2 SiO 5 Coating, the thickness of the coating is 50μm, 50μm, 80μm; magnetron sputtering is used in Yb 2 SiO 5 An aluminum film layer with a thickness of 2μm is prepared on the surface of the coating. The conditions of magnetron sputtering are: magnetron target current 3A, bias voltage 150V; heat treatment of the environmental barrier coating deposited with aluminum film layer, the conditions of heat treatment: 700 ℃ heat preservation for 2h, 1350℃ heat preservation for 20h, heating rate is 10℃ / min, vacuum oxygen partial pressure is less than 2×10 -3 Pa. After cooling to room temperature, an environmental barrier coating is obtained on the surface of the substrate.

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Abstract

The invention relates to the technical field of ceramic coating surface treatment and discloses an coating method of an environmental barrier coating. The method includes the steps that the surface of a rare earth silicate ceramic layer is coated with an aluminum film layer; and the aluminum film layer is subjected to thermal treatment, so that a rare earth aluminate phase is formed at least in pores of one surface, facing the aluminum film layer, of the rare earth silicate ceramic layer. By means of the method, the aluminum film layer is disposed on the surface of the rare earth silicate, then thermal treatment is performed, thus molten aluminum enters the pores of the surface of the rare earth silicate ceramic layer to fill the pores, the molten aluminum has a reaction with rare earth oxide and silicon dioxide which are generated by decomposing the rare earth silicate ceramic layer under the thermal environment so that rare earth aluminate which is more compact and water-resistant can be generated, the service properties of the environmental barrier coating are effectively improved, and the service life of the environmental barrier coating is prolonged. The environmental barrier coating prepared by the method is further disclosed and is good in service property and long in service life.

Description

Technical field [0001] The present invention relates to the technical field of ceramic coating surface treatment, in particular to environmental barrier coatings and coating methods and applications thereof. Background technique [0002] The development of a new generation of high thrust-to-weight ratio aero-engines will inevitably lead to an increase in the temperature of the gas in the aero-engine, and a corresponding increase in the surface temperature of the hot end parts of the high-pressure turbine. The surface temperature of the hot end parts of the high thrust-to-weight ratio aeroengine will reach over 1400°C, far exceeding the temperature range that the existing superalloy materials can withstand. SiC ceramic matrix composites have the characteristics of high temperature resistance (long-term use temperature up to 1650 ℃), low density, high strength, high modulus, oxidation resistance, ablation resistance, and insensitivity to cracks, making them the most effective subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C14/18C23C14/35C23C14/58C23C28/04
CPCC23C14/185C23C14/35C23C14/5806C23C28/322C23C28/345C23C4/11C23C4/134C23C4/10C23C28/321C23C28/3455C23C4/04C23C4/18C23C14/024C23C14/18C23C14/28C23C28/324
Inventor 张小锋王超刘敏邓春明牛少鹏邓子谦毛杰邓畅光张吉阜杨焜徐丽萍宋进兵陈志坤曾威
Owner GUANGDONG INST OF NEW MATERIALS
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