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Detection method of flame spraying type CuAl/NiC coating microstructure

A technology of microstructure and detection method, applied in the field of detection, can solve the problems of difficult identification and differentiation, difficult calculation and analysis of solid lubricant and pore phase content, etc. Coating structure, the effect of improving reliability

Inactive Publication Date: 2014-02-05
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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AI Technical Summary

Problems solved by technology

In order to ensure that the sealing coating has a certain scrapability, there are a certain amount of holes in the coating in addition to a certain amount of solid lubricant. For the multiphase structure of the flame sprayed CuAl / NiC coating, it is solid under the metallographic microscope. Lubricant and holes have the same color, so it is difficult to identify and distinguish. At the same time, if a metallographic microscope with phase analysis function is used to calculate the phase content, it is also difficult to calculate and analyze the phase content of solid lubricants and holes. To evaluate flame spraying CuAl / NiC Coating microstructure presents certain problems

Method used

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  • Detection method of flame spraying type CuAl/NiC coating microstructure

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Embodiment Construction

[0026] A detection method for flame sprayed CuAl / NiC coating microstructure, comprising the steps:

[0027] (1) Metallographic sample preparation steps

[0028] The parts with the coating are cut by a water-cooled grinding wheel cutting machine to obtain a metallographic sample, and the cutting machine adopts Al 2 o 3 A grinding wheel, the thickness of the grinding wheel is 1.5mm, and the cutting speed of the cutting machine is 0.3mm / s;

[0029] Use epoxy resin to carry out vacuum impregnation to the metallographic sample, and the vacuum degree is at 80mbar, so that the epoxy resin is completely filled into the coating hole of the metallographic sample; For metallographic sample preparation, the vacuum degree is 80mbar;

[0030] The metallographic sample preparation is ground and polished to obtain a metallographic sample, the grinding and polishing pressure is 18 Newtons, and a lint-free polishing cloth is used for polishing;

[0031] (2) Detection of the microstructure o...

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Abstract

The invention relates to a detection method of a flame spraying type CuAl / NiC coating microstructure. The detection method comprises the following steps: (1) preparing metallographic specimens; (2) detecting the coating microstructure; (3) determining a qualified index of the coating microstructure; (4) judging whether the coating microstructure is qualified or not. Through using the detection method, the metallographic specimens can be prepared systematically according to the requirement; the judging method and the qualified index of the coating microstructure can be proposed; the quality control level of the flame spraying type CuAl / NiC abrasive sealed coating is increased.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method for the microstructure of flame sprayed CuAl / NiC coating. Background technique [0002] Flame-sprayed CuAl / NiC coating is a medium-temperature abradable sealing coating used below 500 °C. It is widely used in aero-engines and is one of the key technologies in engine gas-path sealing. At present, the performance quality judgment of flame sprayed CuAl / NiC coating in China is only mechanical properties such as hardness or bonding strength, and the quality control of the metallographic and microstructure of the coating is in a blank state. [0003] During the use of flame sprayed CuAl / NiC abradable sealing coating, some technical quality problems or hidden dangers have been exposed. As the life and temperature resistance requirements of various parts become more stringent, in order to ensure the reliability of actual parts, the quality control of coatings based on mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/00G01N1/30G01N1/32
Inventor 张佳平张艺馨邹卓王璐赵忠兴
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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