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A micro-nano composite layered gradient thermal barrier coating and its preparation method

A thermal barrier coating, gradient structure technology, applied in the coating, metal material coating process, pressure inorganic powder coating and other directions, can solve the problem of reducing the thermal insulation ability of the coating, to overcome the rapid decline of thermal insulation Improve service life and strong feasibility

Active Publication Date: 2020-06-19
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual service process, the ceramic thermal barrier coating needs to be exposed to ultra-high temperature environment for a long time, which makes the pores inside the coating heal a lot under the action of sintering, thus significantly reducing the thermal insulation ability of the coating

Method used

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  • A micro-nano composite layered gradient thermal barrier coating and its preparation method
  • A micro-nano composite layered gradient thermal barrier coating and its preparation method
  • A micro-nano composite layered gradient thermal barrier coating and its preparation method

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Embodiment 1

[0033] see figure 2 As shown, the preparation method of the present invention is described by taking the ceramic heat insulating layer 3 as an example with three sublayers.

[0034] The invention provides a method for preparing a thermal barrier coating with a micro-nano composite laminated gradient structure, comprising the following steps:

[0035] In step 1, a metal bonding layer 2 with a thickness of 100 μm is prepared on the surface of a 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-40 μm.

[0036] Step 2, preparing the first sub-layer 31 of the ceramic heat-insulating layer on the metal bonding layer 2 by means of mixed spraying, which specifically includes the following steps:

[0037] Step 2.1. Use yttria-stabilized zirconia with a particle size of 20 μm to 50 μm to smelt and crush the powder, and spray the first coating with a diam...

Embodiment 2

[0053] 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

[0055] The difference between this embodiment and embodiment 1 is that in step 1, the thickness of the metal bonding layer 2 is 125 μm.

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Abstract

The invention discloses a micro-nanometer composite laminated gradient structure thermal barrier coating and a preparation method of the micro-nanometer composite laminated gradient structure thermalbarrier coating. The coating is formed by stacking a plurality of sub-layers with the quantity of N. The ratio of the thickness of each sub-layer to the heat conductivity of the same sub-layer is equal. The thermal conductivity of the sub-layers gradually decreases from the first sub-layer close to a bonding layer to the sub-layer with the serial number of N. Each sub-layer is formed by alternately layering and depositing first thermal barrier coating material powder and second thermal barrier coating material powder. A sheet layer unit with the density greater than 90% is formed by the firstthermal barrier coating material powder, and a sheet layer unit with the density less than 60% is formed by the second thermal barrier coating material powder. The volume of a second thermal barrier coating material accounts for 10%-50% of the total volume of the thermal barrier coating. The micro-nanometer composite laminated gradient structure thermal barrier coating achieves the purpose of resisting sintering of a ceramic coating in a high-temperature environment. Due to the gradient design, reverse restrictions imposed by the thickness of a single structure coating on the heat insulation capability and the service life are lifted, and the sintering resistance and long service life collaborative design of a novel structure is ensured.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a thermal barrier coating with a micro-nano composite laminated gradient structure and a preparation method thereof. Background technique [0002] Thermal barrier coatings (Thermal barrier coatings, TBC) is a functional coating for heat insulation, mostly made of ceramic materials with low thermal conductivity, prepared by thermal spraying. The obtained structure contains a large number of micro- and sub-micron pores, so that the structural thermal conductivity of the coating is further reduced on the basis of the original low thermal conductivity material. Therefore, a TBC with a thickness of 300-500 μm can achieve a temperature drop of 50-300° C. Taking Yttria stabilized zirconia (Yttria stabilized zirconia, YSZ) material widely used at present as an example, the thermal conductivity of YSZ bulk material is about 2.5W / m K, while the thermal conductivity of YSZ coating prepare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/129C23C4/08C23C4/11C23C24/04
CPCC23C4/08C23C4/11C23C4/129C23C4/134C23C24/04
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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