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

A rare earth modification and corrosion performance technology, applied in coatings, metal material coating processes, melt spraying and other directions, can solve problems such as corrosion

Inactive Publication Date: 2007-09-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is usually subject to 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 implementation mode 1: In this embodiment, the method steps of the rare earth modified MCrAlY coating to improve its high temperature sulfidation corrosion resistance are as follows: first prepare the rare earth metal (referred to as RE) and MCrAlY into thermal spray feed, and then heat the feed Spraying on the base material to obtain a RE-MCrAlY coating, where M is Ni, Co or NiCo, rare earth metals account for 0.1 to 5% of the feed, and the thickness of the coating is 300 to 400 μm.

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and the first embodiment is that the rare earth metal is a nano-structured rare-earth metal or a rare-earth metal with nano-scale particles. Others are the same as the first embodiment.

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

specific Embodiment approach 3

[0014] Specific embodiment three: this embodiment is different from specific embodiment one in that the rare earth compound or rare earth mixture and MCrAlY are prepared into thermal spraying feed. Others are the same as 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 material modification, in particular to a method for improving the high-temperature vulcanization corrosion resistance of MCrAlY coatings. Background technique [0002] As a representative of the fourth generation of protective coatings, thermal barrier coatings (TBC) are 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 And the composition of stabilizers. 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 is mainly operated in a high temperatu...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/073
Inventor 王铀
Owner HARBIN INST OF TECH
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