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A method for preparing a high-performance layered thermal barrier coating system

A thermal barrier coating, high-performance technology, applied in coatings, metal material coating processes, climate sustainability, etc., can solve problems such as unfavorable continuous production, reduced production efficiency, surface pollution of alloy bonding layers, etc. Excellent high-temperature oxidation resistance, high-efficiency quality, and excellent thermal shock resistance

Active Publication Date: 2018-09-04
XI AN JIAOTONG UNIV
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Problems solved by technology

It can be seen that the existing thermal barrier coating system needs to use different methods to prepare alloy bonding layer and ceramic layer, which will inevitably involve the problem of reduced production efficiency due to process conversion, which is not conducive to continuous production
At the same time, the conversion of the spraying process can easily lead to surface pollution of the alloy bonding layer

Method used

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  • A method for preparing a high-performance layered thermal barrier coating system
  • A method for preparing a high-performance layered thermal barrier coating system
  • A method for preparing a high-performance layered thermal barrier coating system

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Embodiment 1

[0020] A method for preparing a high-performance layered thermal barrier coating system. CoNiCrAlY alloy powder is used as raw material, and the alloy adhesive layer is sprayed with an internal powder-feeding supersonic atmospheric plasma spray gun. During the spraying process, the power is adjusted to 54.8kW, and the spraying distance is 110mm In the spraying process, high-speed photography and dual-wavelength radiation intensity ratio method are used to measure the flight speed and temperature of alloy powder particles in the plasma jet online, and the obtained particle flight speed is 420m·s -1 , the temperature is 2330°C, the alloy adhesive layer is corroded and observed by scanning electron microscope, the cross-sectional morphology of the obtained coating is as follows figure 1 As shown, the surface morphology is as figure 2 shown. The content of unmelted particles in the coating was analyzed by image processing software to be 35%. The supersonic plasma jet was used t...

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Abstract

The invention discloses a method for manufacturing a high-performance layered thermal barrier coating system. The method comprises the following steps that firstly, an alloy bonding layer is manufactured on the surface of a matrix; secondly, supersonic plasma jet is used for carrying out surface modification treatment on the alloy bonding layer; and thirdly, a single-layer or multi-layer ceramic material coating is manufactured on the modified surface of the alloy bonding layer, and the thermal barrier coating system is obtained. An internal powder feeding supersonic air plasma spraying method is adopted for obtaining the layered thermal barrier coating system formed by the high-temperature alloy bonding layer and a ceramic surface layer. Compared with a traditional method for manufacturing a thermal barrier coating, the problems that due to technological conversion, the coating manufacturing efficiency is low, and the quality batch stability is poor are effectively avoided, important application value for prolonging the high-temperature service life of the a thermal barrier coating is achieved, wide application prospects are achieved in the national defense sophisticated industry such as aeroturbine engines and heavy duty gas turbines, and huge economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a method for preparing a high-performance hierarchical thermal barrier coating system. Background technique [0002] Aviation turbine engines and heavy-duty gas turbines urgently need a high-performance thermal barrier coating system to reduce the temperature of the alloy matrix so as to ensure its normal use under high temperature conditions. The thermal barrier coating system includes an alloy bonding layer, a ceramic layer, and thermally grown oxides (TGOs) formed by oxidation of the alloy bonding layer. This thermally grown oxide is mainly composed of alumina (Al 2 o 3 ) dominated, dense Al 2 o 3 The thin film plays a positive role in preventing further oxidation of the alloy coating. But Al 2 o 3 While the film is forming, some other oxides such as chromium oxide (Cr 2 o 3 ), nickel oxide (NiO) and spinel (NiAl 2 o 4 、NiCr 2 o 4 、CoAl 2 o 4 、C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/073C23C4/134C23C4/18C23C4/11
CPCC23C4/18Y02T50/60
Inventor 白宇唐健江王俊文
Owner XI AN JIAOTONG UNIV
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