Method for prolonging service life of thermal barrier coating based on platinum-aluminum bonding layer

A technology of thermal barrier coating and bonding layer, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problem of film and ceramic coating peeling off, etc., to improve life and prolong service time , anti-oxidation effect

Pending Publication Date: 2022-02-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since Al 2 o 3 Membranes and ceramic coatings are very brittle, and the bonding layer coating is Al 2 o 3 The stress concentration caused by the increase of film (TGO) thickness can easily lead to Al 2 o 3 Film and ceramic coating fall off, so if Al can be suppressed 2 o 3 The growth of film (TGO) can improve the service life of TBCs coating

Method used

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  • Method for prolonging service life of thermal barrier coating based on platinum-aluminum bonding layer
  • Method for prolonging service life of thermal barrier coating based on platinum-aluminum bonding layer
  • Method for prolonging service life of thermal barrier coating based on platinum-aluminum bonding layer

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Experimental program
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Effect test

Embodiment 1

[0037] The base material is directionally solidified nickel-based superalloy DD5.

[0038] Its chemical composition is as follows (mass percentage): Co: 7.5%, Cr: 7%, W: 5%, Mo: 1.5%, Al: 6.2%, Ta: 6.5%, Re: 3%, Ni: the balance. The DD5 superalloy rod with a diameter of 13mm is processed into a disc with a thickness of 2mm by wire cutting, and a round hole of Φ3mm is cut in the middle of the top of the disc to facilitate the suspension during electroplating and vapor deposition.

[0039] The platinum layer was prepared by electroplating, and then aluminum ions were introduced by CVD. The prepared platinum-aluminum coating was 30 μm, and the surface and cross-sectional morphology were as follows: figure 1 and figure 2 shown. The content of Pt at 1 / 3 of the outer layer of the platinum-aluminum coating is 10-40wt%, the content of Ni is 30-40wt%, and the content of Al is 20-40wt%.

[0040] Put the prepared platinum-aluminum-coated alloy sample into the tube furnace, and inject...

Embodiment 2

[0047] The substrate is made of DD5 superalloy, and the superalloy rod with a diameter of 13 mm is processed into a disc with a thickness of 2 mm by wire cutting, and a round hole of Φ3 mm is cut in the middle of the top of the disc to facilitate the process of electroplating and vapor deposition suspension.

[0048] A 30 μm platinum-aluminum coating was prepared by electroplating and chemical vapor deposition, the surface and cross-section are as follows figure 1 and figure 2 shown;

[0049] In the tube furnace, argon gas is used to wash the furnace. After the washing is completed, vacuum is carried out. When the pressure in the furnace reaches 1.5×10 -1 At Pa, start heating to 900°C at a speed of 10-15°C / min;

[0050] After reaching the temperature, feed 99.99% pure oxygen with a flow rate of 35ml / min, and keep it at 900°C for 5 hours for oxidation, and the pressure in the furnace is about 15Pa at this time;

[0051] After the oxidation is finished, stop feeding oxygen,...

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Abstract

The invention discloses a method for prolonging the service life of a thermal barrier coating based on a platinum-aluminum bonding layer, and belongs to the technical field of high-temperature protective coatings. Through a pre-oxidation method, a layer of TGO oxidation film is prepared on the surface of a platinum-aluminum coating in advance to serve as a bottom bonding layer of a TBC coating. The platinum-aluminum coating bonding layer is bonded with a TBCs thermal barrier coating top layer YSZ mainly depending on an oxide film TGO generated on the surface, the thickness increase of the TGO oxide film is in a parabolic growth mode due to the diffusion rate of O and Al atoms, and when the TGO cracks and falls off due to stress concentration generated by the thickness increase of the TGO, the TBC coating loses efficacy. Due to the fact that a layer of compact oxidation film TGO can be generated on the surface of the platinum-aluminum bonding layer in advance through a low-pressure pre-oxidation technology, the growth speed of the TGO is slowed down, and the service life of the TBCs thermal barrier coating can be prolonged.

Description

technical field [0001] The invention relates to the technical field of high-temperature protective coatings, in particular to a method for increasing the service life of a thermal barrier coating based on a platinum-aluminum bonding layer. Background technique [0002] As a platinum-modified aluminide coating with good oxidation resistance and thermal corrosion resistance, it has been widely used in the protection of heat-resistant components such as aero-engines and gas turbine blades. It can be used alone or as an adhesive layer (bond coat) and the surface ceramic layer (such as Y 2 o 3 Stabilized ZrO 2 ) together constitute a thermal barrier coating (TBCs, namely thermal barrier coatings) system to improve the high temperature oxidation resistance and thermal corrosion resistance of components and prolong the service life of components. Related documents such as: ① Chinese invention patent, Pt+Si modified β-NiAl thermal barrier coating and its preparation method, appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C30/00C23C8/12
CPCC23C28/321C23C28/3455C23C30/00C23C8/12
Inventor 于昊君宫骏李运通李伟孙超姜肃猛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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