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Multi-layer thermal barrier coating and forming method thereof

A technology of thermal barrier coating and bottom layer, which is applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve problems such as thermal barrier coating failure, achieve high crack resistance, and ensure stable structure and function resistance, the effect of preventing the entry of oxygen and corrosive media

Active Publication Date: 2015-03-25
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the problem of premature failure of existing thermal barrier coatings in the above-mentioned prior art, the present invention aims to provide a multilayer thermal barrier coating and its forming method

Method used

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  • Multi-layer thermal barrier coating and forming method thereof

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Embodiment Construction

[0022] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0023] The multilayer thermal barrier coating according to the present invention is formed by the following method:

[0024] S1, the substrate 10 is provided by nickel base alloy 738.

[0025] S2, under the condition of not feeding powder, after using the spray gun to preheat the substrate 10 to 250°C, directly spray NiCrAlY powder on the upper surface of the substrate 10 to form the bonding layer 20; at this time, the voltage is set to 60V, and the current is set to is 500A, the main gas pressure is 0.4MPa, the hydrogen pressure is 0.25MPa, the spray gun moving speed is set as 150mm / s, the spraying distance is 100mm, the powder feeding rate is 10g / min, the thickness of the formed bonding layer 20 is About 150μm.

[0026] S3, without powder feeding, use a spray gun to preheat the substrate 10 and the bonding layer 20 to 750°C, and then directly s...

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Abstract

The invention relates to a multi-layer thermal barrier coating. The coating comprises a base body, a binding layer and a ceramic top layer which are sequentially arranged from bottom to top, wherein the ceramic top layer consists of a vertical-crack-containing ceramic bottom layer with different microstructures, a porous intermediate ceramic layer and a compact ceramic top layer, which are sequentially arranged from bottom to top; the invention further provides a forming method of the multi-layer thermal barrier coating; the forming method comprises the following steps: providing the base body and the binding layer; forming the vertical-crack-containing ceramic bottom layer on the upper surface of the binding layer by plasma spraying; forming the porous intermediate ceramic layer on the upper surface of the vertical-crack-containing ceramic bottom layer by virtue of plasma spraying; forming the compact ceramic top layer on the upper surface of the porous intermediate ceramic layer by virtue of plasma spraying. The multi-layer thermal barrier coating containing different microstructures is formed by the vertical-crack-containing ceramic bottom layer, the porous intermediate ceramic layer and the compact ceramic top layer which are sequentially arranged from bottom to top, so that the multi-layer thermal barrier coating has a thermal cycle service life which multiple times that of the existing thermal barrier coating.

Description

technical field [0001] The present invention relates to thermal barrier coatings, and more particularly to a multilayer thermal barrier coating and a method for forming the same. Background technique [0002] Since the early 20th century, turbines have been developing towards high flow ratio, high thrust-to-weight ratio, and high inlet temperature, and the gas temperature and pressure in the combustion chamber have been continuously increased. In order to protect the hot end components from oxidation and corrosion, thermal barrier coatings have been widely studied and applied as an effective protection method. Padture N.P pointed out in Science that thermal barrier coatings play an irreplaceable role in all high-temperature resistant materials that improve the thermal efficiency and service life of engines, turbines, and steam turbines. In the aero-engine propulsion plans of the United States, Europe and my country, thermal barrier coating technology is listed as the three ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/12B32B18/00C23C4/11C23C4/134
CPCY02T50/60
Inventor 王卫泽俞泽新于景业吴良敏陈雨帆
Owner EAST CHINA UNIV OF SCI & TECH
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