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Preparation method for Al-Cr coating on nickel-based superalloy

A nickel-based high-temperature alloy, al-cr technology, applied in metal material coating process, coating, ion implantation plating, etc., can solve the problem of poor thermal corrosion resistance, easy cracking and peeling, high brittleness of NiAl phase coating, etc. problems, achieve uniform and dense structure, control coating composition and thickness, excellent oxidation resistance and hot corrosion performance

Inactive Publication Date: 2014-02-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aluminide coating belongs to diffusion coating, which is characterized by excellent oxidation resistance, but because NiAl phase coating is brittle, easy to crack and peel off, and has poor thermal corrosion resistance, it is necessary to improve the aluminide coating

Method used

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  • Preparation method for Al-Cr coating on nickel-based superalloy
  • Preparation method for Al-Cr coating on nickel-based superalloy

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Embodiment 1

[0019] The base material is Ni-based superalloy DSM 11, and its nominal composition is (mass percentage): 3% Al, 5% Ti, 14% Cr, 9.5% Co, 3.8% W, 1.5% Mo, 2.8% Ta, 0.1% C , Ni balance, the sample size is Ф15mm × 2mm. The Cr layer was deposited by domestic MIP-8-800 arc ion plating equipment. Before depositing the Cr layer, the sample needs to be pretreated. The base material will be polished step by step to 800# with SiC water abrasive paper, and 200-mesh hollow glass pellets will be used for wet sandblasting, followed by deionized water and acetone. Wash for 15 minutes, rinse with absolute ethanol and dry for later use. When the Cr layer is deposited by arc ion plating technology, the vacuum chamber is pre-evacuated to 6×10 -3 Pa, the pressure of the vacuum chamber is raised to 2×10 by introducing Ar gas -1 Pa; pre-sputtering bombardment cleaning of the sample, the target base distance is 240mm, the pulse bias is -800V, the duty cycle is 30%, and the cleaning time is 5min; ...

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Abstract

The invention discloses a preparation method for an Al-Cr coating on a nickel-based superalloy, which belongs to the technical field of high temperature protection coatings. The method comprises the following steps: pretreating a superalloy matrix; depositing a Cr layer on the surface of the cleaned superalloy by using arc ion plating; and finally, carrying out alumetizing through powder embedding so as to obtain the Al-Cr coating on the superalloy. The preparation method for the Al-Cr coating on the nickel-based superalloy has the advantages of good process repeatability, easy realization of industrial production and the like; the prepared coating has a compact structure, high bonding strength on the matrix and controllable components, the storage phase of Al and the content of Cr in the coating are effectively increased, so antioxidation and anti-thermal etching performance of the raising are improved, and the service life of the coating is effectively prolonged. The coating prepared by the preparation method is applicable to protection of the nickel-based superalloy.

Description

technical field [0001] The invention relates to high-temperature protective coating technology, in particular to a preparation method of a nickel-based superalloy Al-Cr coating. Background technique [0002] In the fields of modern energy industry and aerospace, superalloys are an indispensable and important part. The hot end parts of aero-engines and gas turbine engines, especially turbine parts, work under high temperature, high speed and complex stress, not only require good high temperature strength, high creep durability, fatigue performance and excellent structural stability, It is also required that the base material has high resistance to high temperature oxidation and hot corrosion. In order to make superalloys have both excellent mechanical properties and high temperature oxidation resistance, a very effective way is to apply appropriate coatings on the surface of superalloys. [0003] Since the 1950s, high temperature protective coating technology has developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/34C23C10/48
Inventor 孙超吴多利姜肃猛范其香华伟刚宫骏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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