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Anti-sintering long-life double-layer gradient columnar structure thermal barrier coating and preparation method thereof

A technology of columnar structure and thermal barrier coating, applied in coating, metal material coating process, pressure inorganic powder coating, etc., can solve the problem of affecting the service life of the coating, reducing the strain tolerance of the coating, and reducing the thermal insulation function and other problems, to achieve the effect of rapid realization of engineering application, reduction of cracking driving force, and enhancement of fracture toughness

Active Publication Date: 2020-03-17
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal insulation function of TBC after high temperature service will be significantly reduced, which is mainly due to the healing and disappearance of thermal insulation pores inside the coating caused by sintering.
On the other hand, sintering also causes significant rigidification of the coating, which greatly reduces the strain tolerance of the coating, which is prone to cracking and peeling, and affects the service life of the coating.

Method used

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  • Anti-sintering long-life double-layer gradient columnar structure thermal barrier coating and preparation method thereof
  • Anti-sintering long-life double-layer gradient columnar structure thermal barrier coating and preparation method thereof
  • Anti-sintering long-life double-layer gradient columnar structure thermal barrier coating and preparation method thereof

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Embodiment 1

[0048] see figure 1 and figure 2 As shown, the preparation method of the present invention is described by taking the heat insulation layer 4 as an example with three sublayers.

[0049] The invention provides a method for preparing a sintering-resistant long-life double-layer gradient columnar structure thermal barrier coating, which comprises the following steps:

[0050] In step 1, a metal bonding layer 2 with a thickness of 150 μm is prepared on the surface of the cylindrical superalloy substrate 1 by a low-pressure plasma spraying process. The material of the metal bonding layer 2 is spherical NiCoCrAlTaY powder with a particle size of 10 μm to 40 μm.

[0051] Step 2. On the metal bonding layer 2, 8YSZ smelting and crushing powder with a particle size of 5 μm to 25 μm is used to prepare a toughening layer 3 with a thickness of 150 μm by atmospheric plasma spraying. In the process of spraying, in order to make the interlayer bonding rate of the first sheet unit 6 not lo...

Embodiment 2

[0072] The difference between this embodiment and embodiment 1 is that in step 1, the thermal spraying method used is vacuum plasma spraying, supersonic flame spraying or cold spraying.

Embodiment 3

[0074] The difference between this embodiment and embodiment 1 is that in step 1, the thickness of the metal bonding layer 2 is 100 μm; in step 2, during the deposition process, the substrate 1 is preheated to 300°C; In step 5, the temperature of the substrate 1 is controlled to not exceed 180° C. during the deposition process.

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Abstract

The invention discloses a sintering resistance long-life double layer gradient columnar structure thermal barrier coating and a preparation method thereof. The sintering resistance long-life double layer gradient columnar structure thermal barrier coating includes a toughening layer and a thermal-protective layer, wherein the thermal-protective layer is divided by a longitudinal gap and formed bystacking N sublayers, the thickness of each sublayer is equal to the radio of thermal conductivity of the sublayer, and thermal conductivity of the sublayers equidifferently decrease from a first sublayer, near a bonding layer, to an iso-N sublayer; each sublayer is alternately formed by depositing second thermal barrier coating material powder and third thermal barrier coating material powder; and the toughening layer accounts for 10% to 50% of total thickness of the double-structure thermal barrier coating. According to the double layer gradient columnar structure thermal barrier coating, the purpose of sintering resistance of a ceramic coating under a high temperature can be realized, fracture toughness of the coating is enhanced by designing the toughening layer, crazing diving force of the coating is lowered by designing a columnar structure, and long-life service of the thermal barrier coating is realized.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a sintering-resistant long-life double-layer gradient columnar structure thermal barrier coating and a preparation method thereof. Background technique [0002] The main function of thermal barrier coatings (TBC) is to provide thermal insulation protection for the high-temperature hot-end metal components of aero-engines and gas turbines, so that the alloy matrix can serve stably for a long time at temperatures far beyond its temperature limit. Therefore, the most important evaluation index of TBC is its insulation temperature and service life. Usually, the initial as-prepared TBC with a thickness of 300-500 μm can be insulated at 50-300°C. However, the thermal insulation temperature of TBC will decrease significantly under prolonged high-temperature heat exposure. At the same time, the coating is also prone to cracking and peeling. Therefore, how to maintain the thermal insu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/08C23C4/11C23C4/129C23C24/04
Inventor 李广荣王丽爽杨冠军刘梅军刘宏李成新李长久
Owner 咸阳瞪羚谷新材料科技有限公司
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