Graphite Composite
Specimen Preparation (Class 1 Procedures)
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Glass reinforced composites are very useful materials, however microstructural preparation can be tricky. The best approach is to minimize the amount of cracking and chipping in the fibers as early in the preparation stage as is practical. This is accomplished by starting with 320 grit SiC or finer. For rough and final polishing, the use of a resilient polishing pad such as Black Chem, in combination with polycrystalline diamond and SIMAT colloidal silica produce a damage free surface ready for examination.
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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| 120 grit SiC paper 240 grit SiC paper* |
Water |
5-10 lbs | 200/200 rpm | Planar 1 min |
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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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| 6 um DIAMAT diamond on TEXPAN polishing pad |
DIALUBE Purple Extender |
5-10 lbs | 200/200 rpm | 2 min | |
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| 1 um DIAMAT diamond on GOLDPAD or ATLANTIS polishing pad |
DIALUBE Purple Extender |
10 lbs | 200/200 rpm | 2 min | |
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| 0.05 um Nanometer alumina on NAPPAD polishing pad |
5-10 lbs | 100/100 rpm | 1 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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| Longitudinal glass fiber orientation, 100X |
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| Transverse glass fiber orientation, 500X |
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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