Thermal Spray Coating (Nickel-Aluminum)
Specimen Preparation (Class 7 Procedures)
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The metallographic specimen preparation of nickel-aluminum thermal spray coatings is relatively straight forward. Microstructural features of interest include: porosity, flow, thickness and inclusions. Since these materials can have inclusions and particles, vibratory polishing with NANOMETER alumina for several minutes can significantly clean up any remaining surface damage.
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 |
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| 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 |
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| 3 um DIAMAT diamond on GOLDPAD |
DIALUBE Purple Extender |
5 lbs | 200/200 rpm | 2 min | |
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| 1 um DIAMAT diamond
on ATLANTIS polishing pad |
SIAMAT Colloidal Silica |
10 lbs | 200/200 rpm | 2 min | |
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| 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.
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| Nickel-Aluminum Thermal Spray Coating, as polished.
Mag 500x (B.F.) |
ETCHING
Common Etchants
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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