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Self-reinforced multi-mode nano-structured thermal barrier coating with stable phase and preparation method thereof

A nanostructure and thermal barrier coating technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of coating failure, cracks in the coating, etc., and achieve good repeatability, process stability, Realize the effect of simple and efficient process

Active Publication Date: 2019-06-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequent t-m phase transformation occurs, accompanied by 3-5% volume expansion, which allows the formation of cracks in the coating, leading to premature failure of the coating

Method used

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  • Self-reinforced multi-mode nano-structured thermal barrier coating with stable phase and preparation method thereof
  • Self-reinforced multi-mode nano-structured thermal barrier coating with stable phase and preparation method thereof
  • Self-reinforced multi-mode nano-structured thermal barrier coating with stable phase and preparation method thereof

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preparation example Construction

[0031] The invention provides a phase-stabilized self-reinforced multi-mode nanostructure thermal barrier coating and a preparation method thereof, comprising the following steps:

[0032] (1) Yttria-stabilized zirconia (YSZ) spherical particle agglomerates are used as spraying raw materials; wherein, the diameter of the yttria-stabilized zirconia YSZ particle agglomerates is 30-70 μm, and the phase composition is a tetragonal phase structure. The internal grain size of YSZ spherical particle aggregates is 20-60nm.

[0033]The present invention uses nanostructured YSZ spherical particle agglomerates as spraying raw materials. One is based on the Hall-Petch empirical relationship, which clearly proposes that when the grain size is reduced to the nanometer scale (less than 100nm), the strength and hardness of the material will be greatly improved. . Based on this idea, the present invention applies nanostructured materials in the thermal spraying deposition process. By comprehe...

Embodiment 1

[0043] (1) The yttrium oxide partially stabilized zirconia YSZ particle aggregate structure in all embodiments of the present invention is as follows figure 1 Shown in (a), among the present invention, yttria partially stabilized zirconium dioxide YSZ particle agglomerates are used as spraying raw materials, figure 1 It can be seen that the diameter of the aggregate is 30-70 μm, and the mass fraction of yttrium oxide in the spraying raw material is 7% to 8%; the inside of the aggregate is analyzed, such as figure 1 In (b) and (c), it can be seen that the interior is composed of nanostructures with a grain size of 20-60nm, and further from figure 1 The SAED in (d) shows that its phase composition is a tetragonal phase structure.

[0044] (2) In the preparation process of thermal barrier coatings, firstly, superalloys and alloy powders are selected as the substrate and bonding layer raw materials of thermal barrier coatings (TBCs) system, and stacked layer by layer on the bondi...

Embodiment 2

[0049] Different from Example 1, the technological parameters of adopting the supersonic plasma spraying method in the step (3) are: arc current 550A, arc voltage: 150V, main gas flow (Ar): 155slpm, secondary gas flow (H 2 and N 2 ): 40slpm, spraying distance: 110mm, powder feeding rate 50g / min, Spray Watch 2i spray particle online monitoring system test results in particle flight speed of 700m / s, temperature 3700K. The contents of microcracks, rough cracks, melted and recrystallized zone pores, and unmelted nanometer zones in the coating were 9%, 12%, 1.5%, and 10%, respectively.

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Abstract

The invention discloses a self-reinforced multi-mode nano-structured thermal barrier coating with a stable phase and a preparation method thereof. By adopting a supersonic plasma spraying method, alloy powder is sprayed on a substrate to form a bonding layer, and then nano-structured yttria-stabilized zirconia spherical particle aggregates are sprayed on the bonding layer to form the coating. Theprocess parameters of the supersonic plasma spraying method are that arc current is 300-550 A, arc voltage is 110-150 V, main air flow is 120-155 slpm, secondary air flow is 10-40 slpm, the spraying distance is 90-110 millimeters, and the powder feeding amount is 30-50 g / min. A nanocrystalline region (30-90 nanometers), a submicron crystalline region (110-900 nanometers), an unfused nano-region (20-60 nanometers), and a multi-mode nano-structured thermal barrier coating body composed of a semi-melted region and an amorphous region are present inside the coating. The coating has high phase stability and a self-reinforced property.

Description

technical field [0001] The invention relates to the field of turbine blades of aero-engines and heavy-duty gas turbines, in particular to a phase-stabilized self-reinforcing multi-mode nanostructure thermal barrier coating and a preparation method thereof. Background technique [0002] In recent years, nanotechnology has significantly improved the physical and mechanical properties of materials due to grain size effects. Turbine blades are the core components of aero-engines with the highest temperature and the most demanding service conditions. But even for single crystal blade materials, the load-bearing temperature limit is only about 1150°C. Thermal barrier coating is currently recognized internationally as the most practical method that can greatly increase the service temperature of engine blades. All aviation powers have listed thermal barrier coating as a key science and technology. Plasma spraying is currently a common method for preparing thermal barrier coatings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11
Inventor 王玉白宇周峻吴锴柳琪
Owner XI AN JIAOTONG UNIV
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