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Metallographic preparation method of coating

A technology for coating and metallographic samples, applied in the field of metallographic preparation, can solve problems such as large differences, and achieve the effect of improving authenticity

Pending Publication Date: 2020-08-11
CHENGDU ENGINE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a coating metallographic preparation method, the coating metallographic structure prepared by this method is closer to the real coating metallographic structure, which can solve the problem of existing coating The metallographic structure of the layer is quite different from the real coating metallographic structure

Method used

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  • Metallographic preparation method of coating
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  • Metallographic preparation method of coating

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A metallographic preparation method, comprising the steps of:

[0030] (1) Get the sample that is sprayed with cobalt-molybdenum-chromium-silicon coating, put it into dehydrated alcohol and clean;

[0031] (2) Hot-mount the sample after cleaning in step (1), then remove the affected area of ​​the coating damage produced in the cutting process, and remove the thickness to be 1.5mm to obtain a metallographic sample;

[0032] (3) Grinding the metallographic samples processed in step (2) on 180#, 220#, 320#, 500#, 800#, 1200# and 4000# silicon carbide sandpaper successively, each type of sandpaper The grinding pressure is 20N / mt, the grinding speed is 120r / min, and the grinding time is 20s;

[0033] (4) The metallographic sample treated in step (3) is polished on a lint-free cloth made of TexMetC medium-hardness non-woven fiber resin with a diamond compound as a lubricant, and 1 μm is smeared on the lint-free cloth during polishing. diamond paste and 1μm diamond suspensio...

Embodiment 2

[0036] A metallographic preparation method, comprising the steps of:

[0037] (1) Get the sample that is sprayed with cobalt-molybdenum-chromium-silicon coating, put it into dehydrated alcohol and clean;

[0038] (2) hot mount the sample after cleaning in the step (1), then remove the affected area of ​​the coating damage produced in the cutting process, the thickness of the removed part is 1.7mm, to obtain a metallographic sample;

[0039] (3) Grinding the metallographic samples processed in step (2) on 180#, 220#, 320#, 500#, 800#, 1200# and 4000# silicon carbide sandpaper successively, each type of sandpaper The grinding pressure is 30N / mt, the grinding speed is 180r / min, and the grinding time is 40s;

[0040] (4) The metallographic sample treated in step (3) is polished on a lint-free cloth made of TexMetC medium-hardness non-woven fiber resin with a diamond compound as a lubricant, and 1 μm is smeared on the lint-free cloth during polishing. Diamond abrasive paste and 1...

Embodiment 3

[0043] A metallographic preparation method, comprising the steps of:

[0044] (1) Get the sample that is sprayed with cobalt-molybdenum-chromium-silicon coating, put it into dehydrated alcohol and clean;

[0045] (2) hot mount the sample after cleaning in the step (1), then remove the affected area of ​​the coating damage produced in the cutting process, the thickness of the removed part is 1.6mm, to obtain a metallographic sample;

[0046](3) Grinding the metallographic samples processed in step (2) on 180#, 220#, 320#, 500#, 800#, 1200# and 4000# silicon carbide sandpaper successively, each type of sandpaper The grinding pressure is 25N / mt, the grinding speed is 150r / min, and the grinding time is 30s;

[0047] (4) The metallographic sample treated in step (3) is polished on a lint-free cloth made of TexMetC medium-hardness non-woven fiber resin with a diamond compound as a lubricant, and 1 μm is smeared on the lint-free cloth during polishing. Diamond abrasive paste and 1 ...

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Abstract

The invention discloses a metallographic preparation method of a coating, which comprises the following steps: a sprayed test piece is cut, the test piece is taken, and the test piece is cleaned in absolute ethyl alcohol; the cleaned metallographic specimen is subjected to hot inlaying, and then an influence area of coating damage generated in the cutting process is removed; the metallographic specimen is ground on silicon carbide abrasive paper, the grinding pressure ranges from 20 N / mt to 30 N / mt, the grinding rotating speed ranges from 120 r / min to 180 r / min, and the grinding time ranges from 20 s to 40 s; the metallographic specimen is polished on plush-free cloth with a diamond compound as a lubricant, the polishing pressure is 20-30 N / mt, the polishing rotating speed is 250-350 r / min, and the polishing time is 100-140 s; and finally, the metallographic specimen is put into absolute ethyl alcohol to be cleaned and blow-dried to obtain the metallographic specimen. The metallographic structure prepared through the method is closer to a real metallographic structure, and the problem that an existing metallographic structure is greatly different from a real coating structure canbe solved.

Description

technical field [0001] The invention relates to the technical field of metallographic preparation, in particular to a metallographic preparation method of a coating. Background technique [0002] With the advancement of modern science and technology, the performance requirements of engineering equipment are getting higher and higher, but at the same time, the lower the cost, the better. In view of the fact that the destruction of many engineering parts starts from surface damage, such as engineering parts subjected to wear and corrosion, they are usually scrapped due to surface failure. Based on this, material workers began to turn their attention from the overall strengthening of parts to the surface strengthening of parts materials. By thermal spraying a layer of materials with high wear resistance, corrosion resistance and high temperature oxidation resistance on the surface of engineering parts, the product life can be improved. substantial improvement. For example, th...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N1/34
CPCG01N1/286G01N1/32G01N1/34G01N2001/2873
Inventor 吴雷谢善王莉黄勋张琦文陈基东刘卫东
Owner CHENGDU ENGINE GROUP
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