Carbon-Carbon Composite
Specimen Preparation (Class 1 Procedures)
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Proper preparation of carbon composites is required because the properties of the matrix material and the carbon fibers vary significantly in both hardness and fracture toughness. As a general rule, the most difficult components to prepare in composites are the most brittle components (e.g. carbon fibers). To properly prepare carbon-carbon composites, initial sectioning must minimize damage. Proceeding preparation steps must not result in additional damage.
SECTIONING
Diamond Wafering blade - medium grit / low concentration
MOUNTING
Castable Mounting with Epoxy or Acrylic resins
POLISHING
| Abrasive/surface | Lubricant | Force/ sample | Speed (Head/base) |
Time | Individual Force mode |
Central Force mode |
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| 240 grit SiC paper* | Water |
5-10 lbs | 200/200 rpm | Planar |
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| 360 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 |
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| 1 um DIAMAT diamond on ATLANTIS polishing pad |
DIALUBE Purple Extender |
5-10 lbs | 200/200 rpm | 2 min | |
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| CMP polish on BLACKCHEM polishing pad |
10 lbs | 200/200 rpm | 2 min | |
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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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| Carbon-Carbon Composite |
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| Carbon fibers in polymer matrix, 100X, as polished.) |
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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