ALON Ceramic
Specimen Preparation (Class 10 Procedures)
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AlON is a dual phase material consisting of aluminum oxide and aluminum nitride phases. Proper microstructural preparation requires minimizing the relief that can occur in the aluminum nitride phase. Note some relief is helpful in microscopically mapping the aluminum nitride phase. Proper grinding is accomplished with as small a diamond abrasive as possible on a metal mesh cloth. Note there is a trade-off between planar grinding time (abrasive size) and induced damage. In some cases for ceramics, it is better to take more time and minimize damage at planar grinding in order to reduce overall polishing times. The use of SIAMAT colloidal silica also provides a chemical mechanical polishing (CMP) action which is the most effective means for eliminating both surface and subsurface damage. The combination of SIAMAT colloidal silica with DIAMAT polycrystalline diamond also produces the required surfaces finishes.
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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| 70 micron diamond grinding disk* |
Water | 5-10 lbs | 200/200 rpm | Planar |
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| 30 um DIAMAT diamond suspension on CERMESH Meta l Mesh cloth |
5-10 lbs | 200/200 rpm | 5 min |  |
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| 6 um DIAMAT diamond on TEXPAN polishing pad |
SIAMAT colloidal silica |
10 lbs | 200/200 rpm | 5 min | |
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| 1 um DIAMAT diamond on GOLDPAD or ATLANTIS polishing pad |
SIAMAT colloidal silica |
10 lbs | 200/200 rpm | 5 min | |
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| SIAMAT Colloidal silca on TEXPAN polishing pad |
10 lbs | 200/200 rpm | 5 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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| AlON ceramic, B.F. 1000x (as polished) |
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| AlON ceramic, 1000X (DIC), as polished. |
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| AlON ceramic, 200X (BF), as polished, half sputter
coated for increased reflectivity and contrast (left). |
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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