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Novel porosity gradient thermal barrier coating

A thermal barrier coating and porosity technology, applied in the coating, metal material coating process, superimposed layer plating and other directions, can solve the problems of coating peeling, stress concentration, etc. Thermal shock performance and service life, the effect of improving the thermal insulation effect

Inactive Publication Date: 2019-09-27
江苏源清动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are as mentioned above, because the oxygen element oxidizes the metal particles dispersed in the ceramic layer, and the phase change causes the volume change to generate stress concentration, resulting in the final peeling off of the coating.

Method used

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  • Novel porosity gradient thermal barrier coating
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  • Novel porosity gradient thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The thermal barrier coating in Example 1 comprises:

[0039] A metal bonded underlayer grown on the surface of a substrate. The thickness of the metal bond sublayer is 60 μm. The metal bond primer is made of MCrAlY powder.

[0040] A TGO layer grown on top of a metal bonded underlayer. The thickness of the TGO layer is 0.4 μm.

[0041] A ceramic insulation surface layer grown on top of the TGO layer. Ceramic insulation facings are made of zirconia partially stabilized with yttria. The porosity of the ceramic heat-insulating surface layer decreases in a continuous gradient from the interface between the TGO layer and the ceramic heat-insulating surface layer to the outer surface of the ceramic heat-insulating surface layer. The thickness of the ceramic thermal insulation surface layer is 330μm.

[0042] The sample prepared in Example 1 is defined as sample A1.

Embodiment 2

[0044] The thermal barrier coating in embodiment 2 comprises:

[0045] A metal bonded underlayer grown on the surface of a substrate. The thickness of the metal bond primer was 280 μm. The metal bond primer is made of MCrAlY powder.

[0046] A TGO layer grown on top of a metal bonded underlayer. The thickness of the TGO layer is 0.3 μm.

[0047] A ceramic insulation surface layer grown on top of the TGO layer. Ceramic insulation facings are made of yttria-stabilized zirconia. The porosity of the ceramic heat-insulating surface layer decreases in a continuous gradient from the interface between the TGO layer and the ceramic heat-insulating surface layer to the outer surface of the ceramic heat-insulating surface layer. The thickness of the ceramic thermal insulation surface layer is 450 μm.

[0048] The sample prepared in Example 2 is defined as sample A2.

Embodiment 3

[0050] The thermal barrier coating in embodiment 3 comprises:

[0051] A metal bonded underlayer grown on the surface of a substrate. The thickness of the metal bond primer was 300 μm. The metal bond primer is made of MCrAlY powder.

[0052] A TGO layer grown on top of a metal bonded underlayer. The thickness of the TGO layer is 0.7 μm.

[0053] A ceramic insulation surface layer grown on top of the TGO layer. Ceramic insulation facings are made of yttria-stabilized zirconia. The porosity of the ceramic heat-insulating surface layer decreases in a continuous gradient from the interface between the TGO layer and the ceramic heat-insulating surface layer to the outer surface of the ceramic heat-insulating surface layer. The thickness of the ceramic thermal insulation surface layer is 350 μm.

[0054] The sample prepared in Example 3 is defined as sample A3.

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Abstract

The invention relates to a novel porosity gradient thermal barrier coating which comprises a metal bonding bottom layer growing on the surface of a substrate, a thermally grown oxide (TGO) layer growing above the metal bonding bottom layer, and a ceramic thermal insulating surface layer growing above the TGO layer, wherein the ceramic thermal insulating surface layer is made of a single ceramic material composition or a ceramic material formed through compounding a plurality of ceramic material compositions; and the porosity of the ceramic thermal insulating surface layer is in a continuous gradient reduced trend in the direction from the interface between the TGO layer and the ceramic thermal insulating surface layer to the outer surface of the ceramic thermal insulating surface layer. The thermal barrier coating system disclosed by the invention improves the thermal insulating efficiency and the thermal shock resistance of the thermal barrier coating on the premise of ensuring the thermal insulating effect of the thermal barrier coating to further prolong the service life of a turbine blade component.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to a novel thermal barrier coating with gradient porosity. Background technique [0002] A gas turbine is a well-developed and widely used mechanical device that converts the chemical energy of fuel into heat and mechanical energy to drive equipment or facilities such as jet aircraft, large ships, generator sets, and fluid pumps. In order to improve energy utilization efficiency, the metal materials used for the hot end parts of gas turbines are often close to or reach the critical state of their thermal stability when the equipment is working, that is, in order to improve the efficiency of gas turbines, the temperature of the turbine inlet is greatly increased. In fact, the first stage moving and guide vanes of advanced gas turbines are often in a mixed gas atmosphere higher than their melting point when they work. Only because the surface of the metal material is isolated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/04C23C4/073C23C14/16C23C26/00C23C28/00
CPCC23C4/04C23C14/16C23C26/00C23C28/34C23C4/073C23C4/134
Inventor 于大千钱原吉冯泽林
Owner 江苏源清动力技术有限公司
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