Method for improving high temperature resistant sulfidation corrosion property of rare earth modified MCrAlY coating

A technology of rare earth modification and corrosion performance, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., and can solve problems such as corrosion

Inactive Publication Date: 2010-01-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is to solve traditional MCrAlY coating under high temperature, sulfur partial pressure > 0.1Pa, oxygen partial pressure -5 When used in the environment of Pa, it will suffer from serious corrosion problems. A method for improving the high temperature sulfidation corrosion resistance of rare earth modified MCrAlY coatings is provided.

Method used

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  • Method for improving high temperature resistant sulfidation corrosion property of rare earth modified MCrAlY coating
  • Method for improving high temperature resistant sulfidation corrosion property of rare earth modified MCrAlY coating
  • Method for improving high temperature resistant sulfidation corrosion property of rare earth modified MCrAlY coating

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specific Embodiment approach 1

[0011] Specific embodiment one: the method step of rare earth modified MCrAlY coating improving its anti-high temperature sulfidation corrosion performance in the present embodiment is as follows: first rare earth metal (referred to as RE) and MCrAlY are prepared into thermal spraying feeding material, then feeding material is heated The RE-MCrAlY coating is obtained by spraying on the base material, wherein M is Ni, Co or NiCo, the rare earth metal accounts for 0.1-5% of the feeding material, and the thickness of the coating is 300-400 μm.

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the rare earth metal is a rare earth metal with a nanostructure or a rare earth metal with nanoscale particles. Others are the same as in the first embodiment.

[0013] The coating obtained by the method of this embodiment contains nanostructures or nanoscale particles.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment is different from Embodiment 1 in that the rare earth compound or rare earth mixture and MCrAlY are prepared as thermal spraying feedstock. Others are the same as in the first embodiment.

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Abstract

A method for improving sulfurized corrosion resistance under high temperature by rare-earth modified MCrAlY, relates to a material modified method. The invention solves the problem that the traditional MCrAlY generally may be corroded severely when it is used under high temperature in the sulfur partial pressure of more than 0.1 Pa and oxygen partial pressure of less than 10-5 Pa. The inventive method includes the steps of: at first thermal spraying feed is produced by rare-earth metal (RE), rare-earth oxide and MCrAlY, then RE-MCrAlY coating is produced by thermal spraying the feed on the based bady material, wherein M is Ni, Co or NiCo, rare-earth is 0.1-5% of weight of the feeding, the thickness of the coating is 300-400 Mum. The inventive method is easy, and can be widely usable for commercial process. The sulfurized corrosion resistance under high temperature of MCrAlY coating can be improved to twice by adding rare-earth.

Description

technical field [0001] The invention relates to a method for modifying materials, in particular to a method for improving the high-temperature sulfidation corrosion resistance of MCrAlY coatings. Background technique [0002] As a representative of the fourth-generation protective coating, thermal barrier coating (TBC) is currently one of the surface protective coatings with the best high-temperature protection performance and the best application prospects. The traditional TBC is generally a composite coating composed of a ceramic surface layer and a metal transition bottom layer. Among them, the ceramic surface layer is generally made of ceramic oxides such as Al 2 o 3 , ZrO 2 etc. and stabilizer composition. The metal transition bottom layer is usually MCrAlY, because MCrAlY has better high temperature corrosion resistance and bonding strength (where M is Fe, Co, Ni or NiCo, the choice depends on the working environment). TBC mainly works in high-temperature atmosphe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/073
Inventor 王铀
Owner HARBIN INST OF TECH
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