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Gold, Silver, Platinum Specimen Preparation
(Class 2 Procedures)

Metallographic Class 2 sample preparation


Precious metals are relatively soft metals and any loose or fracture abrasive particles can easily embed. This makes specimen preparation very difficult because it gums up diamond grinding disks or specimen becomes embedded with fractured SiC particles when ground with SiC papers. The key to preparation of these materials is to use the tougher alumina abrasives and to chemically etch the specimen in between each grinding step. The purpose of etching is to remove the embedded particles so as not to carry them over to the next preparation step as contamination.

SECTIONING

MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)

MOUNTING

Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

Individual
Force mode

Central Force
mode

P120 grit ALO paper*
P220 grit ALO paper*

Water

5-10 lbs

100/100 rpm

Until plane
1 minute

 

P500 grit ALO paper
P1200 grit ALO paper

Water

5-10 lbs

100/100 rpm

1 minute
1 minute

Metallographic individual polishing force

3 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

1-2 minutes

Metallographic individual polishing force

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

2 minutes

Metallographic individual polishing force

0.05 um Nanometer alumina on MICROPAD polishing pad

 

5-10 lbs

100/100 rpm

1 minute

Metallographic individual polishing force

*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.

PACE Technologies metallographic specimen preparation of silver and silver alloys

99.9% Silver, etched with ammonia peroxide, 200X 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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