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A kind of Pt-modified gradient Al coating and preparation method thereof

A gradient and modification technology, applied in coatings, metal material coating processes, and superimposed layer plating, etc., can solve the problems of lowering melting point and increasing brittleness of coatings, delaying degradation, improving service life, and achieving excellent resistance to corrosion. The effect of high temperature oxidation performance and hot corrosion performance

Active Publication Date: 2021-01-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, directly increasing the Al content in the MCrAlY coating will lead to a decrease in the melting point of the coating and an increase in brittleness.

Method used

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  • A kind of Pt-modified gradient Al coating and preparation method thereof
  • A kind of Pt-modified gradient Al coating and preparation method thereof
  • A kind of Pt-modified gradient Al coating and preparation method thereof

Examples

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Embodiment 1

[0033] In this example, a Pt-modified gradient Al coating is prepared on a nickel-based superalloy. The composition of the nickel-based single-crystal superalloy used is (wt.%): Co 10.0%, Cr 8.0%, W 11.0%, Al 6.0 %, Ti 1.0%, Mo 1.0%, Nb 1.5%, C 0.05%, and the balance is Ni. The coating preparation process is as follows:

[0034] Firstly, the substrate was polished, sandblasted, and ultrasonicated in deionized water and acetone for 30 min successively. Rinse with alcohol and dry before use. When using arc ion plating to deposit MCrAlY coating, pre-evacuate to 7×10 -3 Pa, high-purity Ar gas was introduced during bombardment and deposition, and the vacuum degree was 2×10 -1 Pa. When the sample is pre-sputtered and bombarded to clean, the target base distance is 240mm, the pulse bias is -600V, the duty cycle is 33%, and the cleaning time is 5min; during deposition, the target base distance is 240mm, the arc voltage is 20V, and the arc current is 60~65A, pulse bias voltage is ...

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Abstract

The invention discloses a Pt-modified gradient Al coating and a preparation method thereof, belonging to the technical field of high-temperature protective coatings. First, arc ion plating is used to coat a layer of MCrAlY bottom layer on the superalloy substrate; then, a layer of pure Pt layer is plated on the MCrAlY bottom layer by electroplating, and annealed under vacuum conditions; finally, arc ion plating is used to plate a layer of Pt on the surface. The top layer of pure Al is then annealed accordingly to obtain a Pt-modified gradient Al coating. The outer layer of the coating is rich in Al and the inner layer is rich in Cr, and the outer layer is β-(Ni,Pt)Al and PtAl 2 Mutually. The invention has the advantages of significantly increasing the Al content in the MCrAlY bottom layer and improving its high-temperature oxidation resistance; the content of Pt element in the coating and the thickness of the coating are controllable.

Description

technical field [0001] The invention relates to the technical field of high-temperature protective coatings, in particular to a Pt-modified gradient Al coating and a preparation method thereof. [0002] technical background [0003] MCrAlY coatings are widely used in gas turbine blades and other hot-end components as high-temperature protective coatings, and the Al content in MCrAlY coatings is generally 8-16wt.%. In high temperature service environment, dense Al 2 o 3 The film plays a protective role, but the Al element is consumed in large quantities, so the oxidation resistance and service life of the MCrAlY coating largely depend on the Al content in the coating. However, directly increasing the Al content in the MCrAlY coating will lead to a decrease in the melting point of the coating and an increase in brittleness. If a composite coating or a gradient coating design is used, this problem can be solved well, and the Al content in the MCrAlY coating can be increased t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/16C23C14/32C23C14/58C23C28/02C25D3/52C25D5/50
CPCC23C14/16C23C14/325C23C14/5806C23C28/022C23C28/023C25D3/52C25D5/50
Inventor 孙超孙健刘书彬李伟姜肃猛宫俊何平刘山川褚天义
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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