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Method for corroding crystal grain morphology of surface of nickel-based high-temperature alloy

A technology of nickel-based superalloys and crystal grains, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve problems such as difficult corrosion and achieve increased corrosion depth, Prevents the formation of passivation film and satisfies observation needs

Inactive Publication Date: 2018-05-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the uninterrupted endurance and maintenance cycle of the reburning blade, its ablation resistance in gas must be improved, so the nickel-based superalloy used often adds more alloying elements such as Al and Cr to improve its performance. However, the reaction products of these elements are easy to form a passivation film on the surface of the sample, making corrosion difficult.

Method used

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  • Method for corroding crystal grain morphology of surface of nickel-based high-temperature alloy
  • Method for corroding crystal grain morphology of surface of nickel-based high-temperature alloy
  • Method for corroding crystal grain morphology of surface of nickel-based high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The 40,000 Hz ultrasonic combined corrosion solution was used to corrode the surface grain morphology of nickel-based superalloy (reburned superalloy). Use special glue to stick the ultrasonic transducer on the outer wall of the corrosion reaction vessel, and connect the ultrasonic transducer to the ultrasonic generating circuit board, such as figure 1 shown.

[0052] Roughly grind, finely grind, polish, clean, and dry the nickel-based superalloy samples according to conventional methods, and prepare the required corrosion solution; pour the corrosion solution into the corrosion reaction container with the ultrasonic transducer attached, turn on the ultrasonic Generator circuit switch, so that the ultrasonic transducer excites ultrasonic waves; immerse the nickel-based superalloy sample in the corrosion solution, and corrode it at a certain temperature for a certain period of time. The observation surface of the sample should be placed upwards to make the corrosion unif...

Embodiment 2

[0064] The surface grain morphology of nickel-based superalloy was corroded by 1 million Hz ultrasonic combined corrosion solution. The ultrasonic transducer is placed in the corrosive liquid and connected to the ultrasonic generating circuit board, such as Figure 5 shown.

[0065] Coat the surface of the ultrasonic transducer with a layer of anti-corrosion sealing insulating material; carry out rough grinding, fine grinding, polishing, cleaning, and drying of nickel-based superalloy samples according to conventional methods, and prepare the required corrosion solution; Put the transducer into the corrosion reaction vessel and fix it so that the direction of the ultrasonic wave is downward and keep a certain distance from the bottom of the corrosion reaction vessel; pour the corrosion solution into the corrosion reaction vessel so that the corrosion solution can immerse the ultrasonic transducer; open Switch the ultrasonic generator circuit so that the ultrasonic transducer ...

Embodiment 3

[0068] The 40,000 Hz ultrasonic combined corrosion solution was used to corrode the surface grain morphology of nickel-based superalloy. The corrosion reaction vessel adopts an ultrasonic cleaning machine, such as Image 6 shown.

[0069]Coat a layer of anti-corrosion sealing material on the inner wall of the ultrasonic cleaning machine; carry out rough grinding, fine grinding, polishing, cleaning, and drying of nickel-based superalloy samples according to conventional methods, and prepare the required corrosion solution; pour the corrosion solution Put it into the ultrasonic cleaning machine, turn on the switch of the ultrasonic cleaning machine, and excite the ultrasonic wave; immerse the nickel-based superalloy sample in the corrosion solution, and corrode it at a certain temperature for a certain period of time. The observation surface of the sample should be placed upward to make the corrosion uniform; After the end, the corroded nickel-based superalloy sample is taken o...

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Abstract

The invention discloses a method for corroding the crystal grain morphology of the surface of a nickel-based high-temperature alloy. In a process that a corrosive liquid is used to corrode the surfaceof the nickel-based high-temperature alloy, the corrosive liquid and nickel-based high-temperature alloy undergo supersonic wave vibration. The method is simple and easy to operate. According to themethod, formation of a passivated film is prevented in a corrosion process of a nickel-based high-temperature alloy, diffusion of the corrosive liquid and the corrosion reaction product is quickened,and the corrosion efficiency and effect of the crystal grain morphology of the surface of a nickel-based high-temperature alloy are significantly improved.

Description

technical field [0001] The invention belongs to the field of material analysis, in particular, the invention relates to a method for corroding the surface grain morphology of a nickel-based superalloy. Background technique [0002] There have been some domestic studies on the corrosion of experimental samples under the action of ultrasound, and there have been many reports on the impact of ultrasound on the corrosion rate and corrosion degree. The application in corrosion detection, but the purpose of these studies is to measure the corrosion resistance of materials under different conditions, without considering the surface grain morphology after corrosion. Xiamen University, Tsinghua University, Chongqing University, etc. have studied the application of ultrasonic technology in semiconductor corrosion, the purpose of which is to perform chemical precision processing on the surface of semiconductors, rather than to detect materials. At present, the application of ultrasoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/041
Inventor 许庆彦闫学伟王润楠杨聪唐宁柳百成
Owner TSINGHUA UNIV
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