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A kind of metallographic sample preparation method of plasma spraying tungsten carbide coating

A technology of tungsten carbide coating and metallographic sample, which is applied in the field of metallographic sample preparation of ion sprayed tungsten carbide coating, can solve the problems such as the real judgment of tungsten carbide coating quality, achieve the improvement of preparation level, significant economical Benefits, the effect of huge social benefits

Active Publication Date: 2016-07-06
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the metallographic preparation technology of tungsten carbide coatings in China is blank, which brings great troubles to the real judgment of the quality of tungsten carbide coatings.

Method used

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  • A kind of metallographic sample preparation method of plasma spraying tungsten carbide coating
  • A kind of metallographic sample preparation method of plasma spraying tungsten carbide coating
  • A kind of metallographic sample preparation method of plasma spraying tungsten carbide coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Sampling of WC coating by wire cutting method (such as figure 1 ). To inlay the sample taken, the volume ratio of Epofix type epoxy resin and curing agent is 15:2, stir, place for 8~15min, pour into the sample ring for curing. Then under 20 Newton / piece pressure, use 120 # 6~8 sheets of sandpaper, 300 rpm, water cooling for rough grinding, after rough grinding, under 20 Newton / piece pressure, 220 # 、320 # 、500 # , 800 # , 1200 # , 2400 # and 4000 # Sandpaper, 2 sheets / model, each sandpaper for 30 seconds, 300 rpm, water cooling for fine grinding. Finally, use a lint-free cloth, conventional lubricant, and 1 μ diamond polishing agent to polish the finely ground sample for 2 minutes at 300 rpm.

[0029] From figure 1 It can be seen that the coating structure is clear, there is no crack, and various damages to the sample can be minimized. Since no alumina powder with a mass ratio of 20% was added to the mixed epoxy resin, the hardness difference between the epox...

Embodiment 2

[0031] The mosaic process was carried out on the sample prepared by the wire cutting method in Example 1. The mosaic process was improved on the commonly used cold mounting method, that is, 20% alumina powder was added to the mixed epoxy resin. The process parameters of cold mounting method are (such as figure 2 ): The volume ratio of Epofix type epoxy resin and curing agent is 15:2, add alumina powder with a mass ratio of 20% to the mixed epoxy resin, stir, place for 8~15min, and then pour into the sample Curing takes place in the ring. Then under 20 Newton / piece pressure, use 120 # 6~8 sheets of sandpaper, 300 rpm, water cooling for rough grinding, after rough grinding, under 20 Newton / piece pressure, 220 # 、320 # 、500 # , 800 # , 1200 # , 2400 # and 4000 # Sandpaper, 2 sheets / model, each sandpaper for 30 seconds, 300 rpm, water cooling for fine grinding. Finally, use a lint-free cloth, conventional lubricant, and 1 μ diamond polishing agent to polish the finely gr...

Embodiment 3

[0034] The samples prepared in Example 2 were subjected to rough grinding, fine grinding and polishing processes. The process parameters of coarse grinding, fine grinding and polishing are (such as image 3 ): Coarse Grinding: 25 N / piece under pressure, 120 # 6~8 sheets of sandpaper, 300 rpm, water cooling; fine grinding: 25 Newtons / piece pressure, 220 # 、320 # 、500 # , 800 # , 1200 # , 2400 # and 4000 # Sandpaper, 2 sheets / model, 30 seconds per sandpaper, 300 rpm, water cooling; polishing: lint-free cloth, conventional lubricant, 1μ diamond polishing agent, 300 rpm, polishing for 2 minutes.

[0035] From image 3 It can be seen that with figure 2 compared to, image 3The coating structure in Fig. 1 is in line with the typical morphology of WC coatings. Although there are holes, the edges of the holes are clear and angular, indicating that these holes exist in the original WC coating and reflect the real structure of the coating.

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Abstract

The invention provides a preparation method for a metallographic specimen of a plasma-sprayed tungsten carbide coating. The method is implemented by the following steps: cutting, embedding, grinding and polishing, and is characterized in that sampling is carried out on the surface of the tungsten carbide coating by adopting a linear cutting process; embedding is carried out by adopting a cold embedding process, and aluminum oxide powder of which the ratio by mass is 20% is added into well-mixed epoxy resin; rough grinding and fine grinding are respectively carried out under the pressure of 25 newtons, and after cooling, polishing is carried out by using lint-free cloth, a convention lubricant and a 1 micron diamond polisher at a speed of 300 resolutions per minute for 2 minutes. The method has the following advantages that due to the adoption of linear cutting, the sampling effect is great, and various damages to the specimen reach the minimum; the coating specimen is better due to determined technical parameters, the quality of the coating can be more accurately judged, and the application reliability of the coating is improved. The domestic blankness in the key technology for the metallographic preparation of the plasma-sprayed tungsten carbide coating is filled.

Description

technical field [0001] The invention relates to a technology for preparing metallographic samples of thermal spraying coatings, in particular to a method for preparing metallographic samples of plasma spraying tungsten carbide coatings. Background technique [0002] Due to the diversity of thermal spray coating composition and the complexity of the coating structure, the metallographic preparation of thermal spray coatings is much more difficult and complex than that of the overall material. Different thermal spray coatings should have metallurgical properties suitable for their own characteristics. This regulation has higher requirements for sensitive coatings that are easily affected by the sample preparation process. [0003] Plasma sprayed tungsten carbide coating is mainly used for anti-sliding friction, vibration friction, wear resistance and anti-corrosion protection on aero-engines below 500 ℃, and has been widely used in aero-engines at home and abroad. Since there...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 常秋梅张春刚程世远范铁兵刑翠环
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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