Thermal Spray Coating (Tungsten-Cobalt)
Specimen Preparation (Class 7 Procedures)
The metallographic specimen preparation of thermal spray coatings is affected by the specimen composition and deposition conditions. Microstructural features of interest include: porosity, flow, thickness and inclusions. Proper metallurgical preparation takes into account that the microstructure may be porous and perhaps somewhat brittle because of inadequate processing. Following proper cutting to avoid creating undue damage, the specimen is generally mounted in either a castable epoxy or acrylic.
SECTIONING
MAXCUT Abrasive blade (Cat. No. MAX-E or MAX-I series) (if required)
MOUNTING
Compression Mounting fine EPOCOMP Epoxy compression mounting resins
POLISHING
Abrasive/surface |
Lubricant |
Force/ sample |
Speed
(Head/base) |
Time |
Individual
Force mode |
Central Force
mode |
240 grit SiC paper*
|
Water
|
5-10 lbs |
200/200 rpm |
Planar
|
|
|
320 grit SiC paper
400 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper |
Water
|
5-10 lbs |
200/200 rpm |
1 min
1 min
1 min
1 min
1 min
|
|
|
3 um DIAMAT diamond
on GOLDPAD
|
DIALUBE Purple
Extender |
5 lbs |
200/200 rpm |
2 min |
|
|
1 um DIAMAT diamond
on
ATLANTIS polishing pad |
SIAMAT Colloidal
Silica |
10 lbs |
200/200 rpm |
2 min |
|
|
0.05 um NANOMETER Alumina
on
MICROPAD polishing pad |
Vibratory Polishing |
15-30 min |
|
*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.
|
Tungsten-Cobalt Thermal Spray Coating, as polished.
Mag 200x (B.F.) |
|
Tungsten-Cobalt Thermal Spray Coating, polished-etched
with Vibratory Polisher, Mag 1000x (B.F.) |
ETCHING
CAUTION:Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.
PACE TECHNOLOGIES CONTACT
PACE Technologies
3601 E. 34th St.
Tucson, Arizona 85713
+1-520-882-6598
FAX +1-520-882-6599
email: pace@metallographic.com
https://www.metallographic.com
Information Requests
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