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

A technology of thermal barrier coating and columnar structure, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of micropore healing and disappearance, and achieve the overcoming of significant decline in performance, strong feasibility, and rapid realization The effect of engineering application

Pending Publication Date: 2019-05-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fundamental reason is that sintering causes the healing and disappearance of a large number of micropores inside TBCs that play a role in heat insulation

Method used

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

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preparation example Construction

[0033] see figure 1 As shown, the present invention provides a method for preparing an anti-sintering long-life double-layer columnar structure thermal barrier coating, comprising the following steps:

[0034] Step 1. Prepare a metal bonding layer 2 with a thickness of 150 μm on the outer surface of the cylindrical superalloy substrate 1 by using a low-pressure plasma spraying process.

[0035] 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 layer unit 6 not lower than 50%, use a heating platform to preheat the substrate 1 and the metal bonding layer 2 to 400°C before spraying; the first layer The unit 6 has a dimension perpendicular to the direction of heat flow of 5 μm to 40 μm, and a dimension along the direction of heat flow of 0...

Embodiment 2

[0045] The difference between this embodiment and embodiment 2 is that in step 1, the thickness of the metal bonding layer 2 is 100 μm; in step 2, the temperature of the substrate is preheated to 300° C. during the deposition; During the process, the substrate temperature is controlled to not exceed 180°C.

Embodiment 3

[0047] The difference between this embodiment and embodiment 3 is that in step 1, the thickness of the metal bonding layer 2 is 125 μm; in step 2, the temperature of the substrate is preheated to 500° C. during the deposition; During the process, the substrate temperature is controlled to not exceed 160°C, and the liquid concentration of the nanometer YSZ dispersion is 5mol / L.

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Abstract

The invention discloses an anti-sintering long-life double-layer columnar structure thermal barrier coating and a preparation method thereof. The anti-sintering long-life double-layer columnar structure thermal barrier coating comprises a toughening layer located inside and a heat insulation layer located outside, the heat insulation layer comprises a longitudinal gap in the heat flow direction, and the heat insulation layer is composed of composite stacking of compact sheet-layer units and loose nano particle piles; the toughening layer accounts for 10%-50% of the total thickness of the double-layer structure thermal barrier coating, wherein the fracture toughness of a first thermal barrier coating material is greater than or equal to 2.5MPa.m<1 / 2>; and the heat insulation layer accountsfor 50%-90% of the total thickness of the double layers, and the thermal conductivity of a second thermal barrier coating material and a third thermal barrier coating material at the temperature of 1000-1600 DEG C does not exceed 2.5W / m.K. According to the double-layer columnar structure thermal barrier coating provided by the invention, the purpose of resisting sintering of the ceramic coating ina high-temperature environment can be achieved, and the cracking resistance of the coating is enhanced through the design of the toughening layer and the columnar structure, so that the anti-sintering and long-life collaborative design of the novel structure thermal barrier coating is realized.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an anti-sintering long-life double-layer columnar structure thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) are one of the core technologies in the development of aero-engines and gas turbines. At present, the hot-end components of aero-engines and gas turbines are mostly made of high-temperature alloys, and their temperature limit does not exceed 1100°C, which is far from meeting the service temperature of the hot-end components inside the engine. Therefore, TBCs with thermal insulation must be coated on the surface of the superalloy hot end components, so that the superalloy can serve stably in an environment far exceeding its temperature limit. Therefore, the structural design of TBCs must take into account both its thermal insulation function and service life. [0003] The sintering of TBCs under long-...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06C23C4/11
Inventor 李广荣王丽爽杨冠军刘梅军刘宏李成新李长久
Owner XI AN JIAOTONG UNIV
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