Multi-layer structure self-repairing thermal barrier coating layer and preparation method thereof

A multi-layer structure, thermal barrier coating technology, applied in coating, metal material coating process, fusion spraying, etc., can solve problems such as difficult to achieve 100% perfect repair

Inactive Publication Date: 2019-05-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is an ideal self-healing material, but it is difficult to achieve 100% perfect repair in reality

Method used

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  • Multi-layer structure self-repairing thermal barrier coating layer and preparation method thereof
  • Multi-layer structure self-repairing thermal barrier coating layer and preparation method thereof
  • Multi-layer structure self-repairing thermal barrier coating layer and preparation method thereof

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preparation example Construction

[0033] The invention relates to a self-repairing thermal barrier coating with a multilayer structure and a preparation method thereof, specifically to design and prepare a thermal barrier coating capable of self-repairing at high temperatures, thereby prolonging its service life. The multilayer structure self-healing thermal barrier coating has a three-layer structure, which is YSZ / TAZ((1-y)TiC+xAl 2 o 3 +(y-x)YSZ) / MCrAlY, that is, sequentially deposit MCrAlY primer layer on the superalloy substrate, (1-y)TiC+xAl 2 o 3 +(y-x)YSZ self-healing layer (intermediate layer), YSZ ceramic layer, where M is Co and / or Ni, that is, the underlying layer can be CoNiCrAlY, NiCoCrAlY, CoCrAlY, NiCrAlY, 0.65≤y≤0.85, 0.05≤x≤0.15 , x, y all represent weight percent (wt.%), namely 65wt.%≤y≤85wt.%, 5wt.%≤x≤15wt.%. The present inventor adopts finite element simulation calculation to design and optimize the multilayer structure YSZ / TAZ ((1-y)TiC+xAl 2 o 3+(y-x)YSZ) / MCrAlY self-healing thermal ...

Embodiment 1

[0059] Preparation of spray feed. The preparation process is as follows: first ball milling → first spray drying → first sintering → second ball milling → second spray drying;

[0060] One-time ball milling: feed 25kg, water content 60.2%, add 4% PVA aqueous solution, ball mill 400r / min, 6h, ball mill pulping is the original nano-scale TiC, Al 2 o 3 , YSZ is mixed according to the stoichiometric ratio, and a certain amount of deionized water and binder (usually polyvinyl alcohol PVA) and a certain amount of ball milling balls are added. The ZrO used in this embodiment 2 The diameter of the ball is Φ7mm, and the ratio of the added ball to material is operated according to the volume ratio of 10:3;

[0061] Primary spray drying: the rotation speed of the atomizing disc is 23000r / min, the inlet air temperature is 230°C, the outlet air temperature is 110°C, the feeding frequency is 4-6kHz, and the particle size analysis of the primary spray drying powder is carried out. The par...

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Abstract

The invention relates to a multi-layer structure self-repairing thermal barrier coating layer and a preparation method thereof. The multi-layer structure self-repairing thermal barrier coating layer comprises a bottom layer, a middle layer and a ceramic layer which are sequentially formed on a high-temperature alloy substrate; the chemical formula of the bottom layer is MCrAlY, wherein M is Co and / or Ni; the chemical composition of the middle layer is (1-y)TiC + xAl2O3+(y-x)YSZ, wherein y is larger than or equal to 0.65 and smaller than or equal to 0.85, and x is larger than or equal to 0.05 and smaller than or equal to 0.15; and the ceramic layer is a YSZ based coating layer.

Description

technical field [0001] The invention relates to a multilayer structure self-repairing thermal barrier coating with life-prolonging effect and a preparation method thereof, belonging to the technical field of thermal protection inorganic materials. Background technique [0002] As an important inorganic coating material, thermal barrier coatings are widely used on superalloy blades or other high-temperature hot-end parts of aero-engines, heavy-duty gas turbines on the ground (referred to as "two machines"). From high temperature heat insulation, anti-oxidation, anti-wear or corrosion effects, as the performance requirements of "two machines" continue to rise, higher and higher requirements are put forward for thermal barrier coatings. Long-life and high-reliability thermal barrier coatings have always been an urgent need for thermal barrier coatings for "two machines", and to achieve long life of thermal barrier coatings, it is necessary to try to extend the life of the coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/129C23C4/073C23C4/10C23C4/11
Inventor 王亮明辰王有伟宋二红邱吴劼黄健
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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