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Preparation method of YSZ thermal barrier coating of sheet micro-nano column crystal structure

A thermal barrier coating, micro-nano technology, applied in coatings, metal material coating processes, air transportation, etc., can solve the problems of large thickness of the layered structure of the coating, low flying speed of droplets, and insufficient flattening. , to achieve the effect of improving thermomechanical properties, increasing flat rate, and increasing cooling rate

Inactive Publication Date: 2016-09-28
XI AN JIAOTONG UNIV
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Problems solved by technology

However, in the current general plasma spraying method, due to the low flying speed of the molten droplets in the plasma jet, the flattening is insufficient, resulting in a large thickness of the layered structure of the coating (or called a spread) and a low bonding rate between each other. weaker strength

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  • Preparation method of YSZ thermal barrier coating of sheet micro-nano column crystal structure
  • Preparation method of YSZ thermal barrier coating of sheet micro-nano column crystal structure
  • Preparation method of YSZ thermal barrier coating of sheet micro-nano column crystal structure

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Embodiment Construction

[0023] A preparation method of a thin-film micro-nano-column crystal structure YSZ thermal barrier coating of the present invention comprises the following steps:

[0024] (1) All examples are as follows figure 1 The grain size shown is in the sub-micron level (100-900μm) yttrium oxide partially stabilized zirconia (YSZ) agglomeration powder is the raw material for spraying, the particle size after agglomeration is 10-50μm, and the mass fraction of yttrium oxide in the raw material is 5% to 8%; all examples in Table 1 use a supersonic plasma spray method with an internal powder feeding, single anode Laval nozzle to prepare YSZ coatings. During the spraying process, the back of the substrate is cooled by compressed air, and the temperature is controlled within the range of 100-200 °C. In the preparation process, the spraying process parameters are: arc current: 300-550A, arc voltage: 115-140V, main gas flow: 60-80slpm, secondary gas flow: 14-24slpm, spraying distance: 80-120mm...

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Abstract

The invention discloses a preparation method of a YSZ thermal barrier coating of a sheet micro-nano column crystal structure. The average thickness of laminated structures (or spreading sheets) formed in different embodiments is measured, so that the thickness of each spreading sheet of the obtained supersonic speed plasma spray coating is approximately one third that of a common plasma spray coating. The structure of the supersonic speed plasma spray coating is represented through a field emission scanning electronic microscope, so that a double-mode microstructure with submicron crystals and nanocrystals coexisting therein appears inside each spreading sheet; and the content of different submicron crystals and nanocrystals inside each spreading sheet is further disclosed through a thermal etching displaying method and a quantitative statistic method.

Description

technical field [0001] The invention relates to the field of aero-engines and heavy-duty gas turbine turbine blades, in particular to a preparation method of a YSZ thermal barrier coating with a thin-film micro-nano columnar crystal structure. Background technique [0002] Turbine blades are the core components of aero-engines with the highest temperature and the most severe service conditions. But even for single crystal blade material, its bearing temperature limit is only about 1150℃. Thermal barrier coating is currently recognized internationally as the most feasible 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 a common method for preparing thermal barrier coatings. However, in the current general plasma spraying method, due to the low flying speed of the droplets in the plasma jet, the flattening is not sufficient, resulting in a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11
CPCY02T50/60
Inventor 白宇王玉
Owner XI AN JIAOTONG UNIV
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