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Thermal Spray Coating (Tungsten-Cobalt) Specimen Preparation
(Class 7 Procedures)

Metallographic Class 7 sample preparation


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

320 grit SiC paper
400 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper

Water
Water
Water
Water
Water

5 lbs
5 lbs
5 lbs
5 lbs
5 lbs

200/200 rpm

Until plane
1 minute
1 minute
1 minute
1 minute

3 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5 lbs

200/200 rpm

2 minutes

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

10 lbs

200/200 rpm

2 minutes

Vibratory polishing with 0.05 um NANOMETER Alumina on a MICROPAD polishing pad 15-30 minutes

Metallographic micrograph of NiCr plasma spray coating

Tungsten-Cobalt Thermal Spray Coating, as polished. Mag 200x (B.F.)

Metallographic micrograph of NiCr plasma spray coating

Tungsten-Cobalt Thermal Spray Coating, polished-etched with Vibratory Polisher, Mag 1000x (B.F.)

ETCHING

Common Etchants
PACE Technologies Recommended Etchants

PACE Technologies Etchant Database

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.


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3601 E. 34th St.
Tucson, Arizona 85713
+1-520-882-6598
FAX +1-520-882-6599
email: pace@metallographic.com
www.metallographic.com


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Metallographic
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Abrasive Blades
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PACE Technologies ® - 3601 E. 34th St., Tucson, AZ 85713, USA
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