Graphite Composite Specimen Preparation
(Class 1 Procedures)
Proper preparation of polymer / graphite composites is required because the properties of the matrix material and the graphite particles vary significantly in both hardness and fracture toughness. As a general rule, the most difficult component to prepare in composite materials are the most brittle component (e.g. graphite particles). To properly polymer-graphite composites, initial sectioning must minimize damage. This is generally accomplished with a fine grit diamond wafering blade. Proceeding preparation steps must not add additional damage, this is accomplished by a matching the proper abrasive to to the proper polishing surface.
SECTIONING
Diamond Wafering blade - fine grit / low concentrationMOUNTING
Castable Mounting with Epoxy or Acrylic resinsPOLISHING
Abrasive/surface |
Lubricant |
Force/ sample |
Speed |
Time |
Individual Force mode |
Central Force |
240 grit SiC paper |
Water |
5 lbs |
200/200 rpm |
Until plane |
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360 grit SiC paper |
Water |
5-10 lbs |
200/200 rpm |
1 minute |
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6 um DIAMAT diamond on TEXPAN polishing pad |
DIALUBE Purple Extender |
3-5 lbs |
200/200 rpm |
3 minutes |
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1 um DIAMAT diamond ATLANTIS polishing pad |
DIALUBE Purple Extender |
3-5 lbs |
200/200 rpm |
2 minutes |
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0.05 um NANOMETER Alumina on MICROPAD/ MICROPAD 2 polishing pad |
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3-5 lbs |
100/100 rpm |
45 seconds |
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*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.
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Polymer / Graphite Composite, as polished, 200X (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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