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A method for interface purification of wear-resistant and anti-oxidation coating of single crystal superalloy

An anti-oxidation coating and superalloy technology, applied in the field of surface coating and protection of metal parts, can solve the problems of easy cracking coating, destroying the stability of single crystal structure, peeling, etc., to eliminate harmful hard and brittle phases, improve Thermal fatigue resistance, the effect of improving bonding properties

Active Publication Date: 2019-05-03
江西瑞曼增材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the solder composition in the vacuum brazing process, melting elements such as Si and B are usually added to reduce the melting point of the solder, and these elements will form Ni at the interface between the coating and the substrate. 3 Silicides such as Si and borides such as CrB are hard and brittle phases, which are easy to crack under thermal cycle conditions and cause coating peeling off
In addition, the carbide strengthening phase in the wear-resistant and anti-oxidation coating will diffuse to the single crystal matrix during the brazing process, and combine with the carbide forming elements in the single crystal matrix to form carbides, thus destroying the structural stability of the single crystal

Method used

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  • A method for interface purification of wear-resistant and anti-oxidation coating of single crystal superalloy
  • A method for interface purification of wear-resistant and anti-oxidation coating of single crystal superalloy
  • A method for interface purification of wear-resistant and anti-oxidation coating of single crystal superalloy

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Embodiment 1

[0033] The blade material of an aeroengine is DD407 single crystal superalloy, and its shroud damping surface is often subjected to fretting wear and high temperature oxidation. When the wear-resistant and anti-oxidation coating is prepared by vacuum fusion coating, a large number of silicide hard and brittle phases are formed on the interface, which becomes The birthplace of thermal fatigue cracks reduces the performance of the coating, and it is necessary to purify the interface to improve the bonding performance of the coating and the substrate. Grind the part to be strengthened layer by layer with a micro grinder and sandpaper to a smooth surface, remove the deformed layer and residual stress, ultrasonically clean it in acetone to remove oil and impurities, and dry it with an electric hair dryer for later use. Coating powder NiCr-75%Cr 3 C 2 , Nickel-based self-fluxing alloy powder Ni-19Cr-10Si and pure Cr powder are mixed in a ball mill according to a certain ratio; rati...

Embodiment 2

[0037] The damping surface of the serrated crown of the low-pressure turbine rotor blade of an aero-engine needs to be protected by a wear-resistant and anti-oxidation coating due to fretting wear. The blade material is DD6 nickel-based single crystal superalloy, and NiCoCrAlY-75%Cr is prepared by vacuum melting 3 C 2 In the case of wear-resistant and anti-oxidation coatings, the structure of the single crystal matrix is ​​unstable, and a large number of strengthening elements such as Ti, Ta, etc. diffuse to the interface to form MC-type carbides, and at the same time generate silicide hard and brittle phases, which seriously affect the performance of the coating. The interface needs to be sanitized. Grind the part to be strengthened layer by layer with a micro grinder and sandpaper to a smooth surface, remove the deformed layer and residual stress, ultrasonically clean it in acetone to remove oil and impurities, and dry it with an electric hair dryer for later use. Coating ...

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Abstract

The invention belongs to the field of surface coating and protection of metal parts, and particularly relates to an interface purification method for a wear-resistant anti-oxidation coating of single-crystal super alloy. The method comprises the steps that (1), a to-be-strengthened portion of a single-crystal super alloy part is polished to be smooth layer by layer, a deformation layer and residual stress are eliminated, and oil stains and impurities are removed through acetone ultrasonic cleaning; (2), coating powder NiCr-Cr3C2 or MCrAlY-Cr3C2, nickel-based self-fluxing alloy powder and pureCr powder are sequentially put into a ball grinding mill to be mixed to be uniform; (3), the mixed powder and an ash-free organic binding agent are mixed and stirred to be uniform to form pasty powder; (4), the pasty powder is compressed into sheets and placed on the to-be-strengthened surface of the single-crystal super alloy part, and then the whole single-crystal super alloy part is put into adrying oven to be dried; and (5), the dried part is put into a vacuum brazing furnace and subjected to the brazing coating process in vacuum, the brazed part is cooled along with the furnace to room temperature and taken out, and the wear-resistant anti-oxidation coating which combines metallurgy and interface purification is obtained.

Description

technical field [0001] The invention belongs to the field of surface coating and protection of metal parts, in particular to NiCr-Cr prepared by vacuum fusion coating on the surface of a single crystal superalloy 3 C 2 Interface purification method of wear-resistant and anti-oxidation coating. Background technique [0002] Single crystal superalloy hot end components are often subject to friction, wear and high temperature oxidation, and are usually protected by applying wear-resistant and anti-oxidation coatings on the surface. Vacuum brazing can prepare metallurgically bonded dense wear-resistant and anti-oxidation coatings without melting the substrate, so it has great potential in the field of single crystal superalloys. However, in the solder composition in the vacuum brazing process, melting elements such as Si and B are usually added to reduce the melting point of the solder, and these elements will form Ni at the interface between the coating and the substrate. 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F1/00C22C29/06
CPCB22F1/0003B22F7/04B22F2007/042C22C29/005C22C29/067
Inventor 王德谢玉江王明生迟长泰陈新贵王文琴
Owner 江西瑞曼增材科技有限公司