A Laser Powder Deposition Method for Controlling the Interface Morphology of Thermal Barrier Coatings

A technology of laser powder and thermal barrier coating, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., which can solve the problem of interface toughness decline, ceramic layer peeling, interface bonding strength, and crack growth inhibition. and other problems, to achieve the effect of enhancing the mechanical bonding strength and increasing the service life of the thermal cycle

Active Publication Date: 2017-03-15
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared coatings have their own characteristics and advantages, after long-term thermal cycling, the compressive stress generated by TGO growth, the thermal mismatch stress caused by the thermal expansion coefficient mismatch with the base material, and the brittle phase caused by Al depletion The formation leads to the decrease of interface toughness, etc., which cause the growth and proliferation of cracks in the TGO and ceramic layers, and the final peeling of the ceramic layer
At present, the application of laser technology in thermal barrier coatings mainly focuses on the surface modification of ceramic layers or the preparation of metal bonding layers, but this has little effect on the enhancement of the bonding strength of the interface and the inhibition of crack propagation.

Method used

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  • A Laser Powder Deposition Method for Controlling the Interface Morphology of Thermal Barrier Coatings
  • A Laser Powder Deposition Method for Controlling the Interface Morphology of Thermal Barrier Coatings
  • A Laser Powder Deposition Method for Controlling the Interface Morphology of Thermal Barrier Coatings

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Embodiment 1

[0031] First, the Hastelloy superalloy substrate is cleaned, degreased and sandblasted, and then a NiCrAlY metal bonding layer with a thickness of 150 μm is deposited on the substrate by atmospheric plasma spraying. According to the set parameters, laser powder deposition technology is used to introduce a grid layer on its surface such as figure 2 As shown, the spacing between the grids is 2.5 mm, the height is 500 μm, the width of a single metal grid is 500 μm, the composition is the same as that of the bonding layer, and the upper surface of the grid is an arc surface. The maximum power of the fiber laser is 1000W, the spot diameter of the laser beam is 600μm, the laser power is 80-120W, and the flow rate is 6L / min. min. Finally a ceramic layer with a thickness of 200 μm was deposited by atmospheric plasma spraying. After a thermal cycle at 1150°C, the thermal barrier coating (without grid structure) of the traditional structure has a peeling area of ​​more than 50%, whil...

Embodiment 2

[0033]First, according to the conventional process, the Hastelloy superalloy substrate is cleaned, degreased, and sandblasted with alumina particles of a certain particle size. According to the experimental settings, the grid layer is introduced on the substrate by laser powder deposition technology. The specific parameters are: the grid spacing is 2.5 mm, the height is 130 mm, the single grid width is 500 μm, and the composition is Inconel718. The maximum power of the laser is 1000W, the beam spot diameter of the electron beam is 600μm, and the molten pool is protected by argon gas, the flow rate is 6L / min, and the powder feeding amount is 3g / min. Metallic bonding layers and ceramic layers with a thickness of 150 μm and 200 μm were then deposited thereon by atmospheric plasma spraying. The composition of the bonding layer is NiCrAlY, and the ceramic layer is 8YSZ. After a high-temperature thermal cycle at 1150°C, when the peeling area of ​​the thermal barrier coating (withou...

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Abstract

The invention relates to a laser powder deposition method for regulating and controlling the interface morphology of a thermal barrier coating. The laser powder deposition method comprises the following steps: performing rust removal on a metal base body, degreasing and performing abrasive blasting pretreatment; preparing a metal bonding layer on the upper surface of the metal base body by plasma spraying or hypersonic flame spraying; depositing laser powder on the metal bonding layer to introduce a grid layer with a regular shape and controllable parameters; and spraying the outer side of the grid layer by utilizing the plasma spraying or electronic beam physical vapor deposition to prepare a ceramic coating. Compared with the prior art, the laser powder deposition method for regulating and controlling the interface morphology of the thermal barrier coating has the advantages that the grid layer is introduced to a traditional thermal barrier coating structure by adopting a laser powder deposition technique, so that the mechanical bond performance of adjacent coatings is improved, the horizontal expansion of horizontal cracks is limited, and vertical cracks in the ceramic coating are uniformly distributed; and therefore, the performance of the thermal barrier coating is remarkably improved, and the service life is remarkably prolonged.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to a laser powder deposition method for regulating the interface morphology of thermal barrier coatings. Background technique [0002] With the development of aero-engines towards higher thrust-to-weight ratios, the increase of turbine inlet temperature has become the most important problem to be solved. At present, the temperature of the turbine inlet before aviation has reached 1700°C. Excessively high temperature environment will cause destructive effects such as melting, high temperature creep, and thermal fatigue of the alloy, and ultimately shorten the service life. In order to solve this problem, the main direction is divided into: firstly, to prepare a new type of high temperature stable alloy; secondly, to adopt more advanced cooling technology; thirdly, to adopt a thermal barrier coating with high temperature resistance, low thermal conductivity and corrosion resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C4/08C23C4/04C23C28/00C23C4/073C23C4/134
CPCC23C4/08C23C4/10C23C24/103C23C28/34Y02T50/60
Inventor 罗丽荣张骁丽赵晓峰齐欢郭芳威
Owner SHANGHAI JIAOTONG UNIV
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