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Carbon-Carbon Composite Specimen Preparation

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

320 grit SiC paper
600 grit SiC paper

Water

5-10 lbs

100/100 rpm

Until plane
1 minute

6 um DIAMAT diamond on TEXPAN polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

3 minutes

1 um DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

2 minutes

0.05 um Nanometer alumina on NAPPAD polishing pad

 

5-10 lbs

100/100 rpm

1 minute


Metallographic micrograph of carbon composites

Carbon-Carbon Composite

Carbon-carbon composite microsctructure
Carbon fibers in polymer matrix, 100X, as polished.
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