SiC particles in Titanium Matrix Welded to Carbon Steel (MMC)
Specimen Preparation (Class 9 Procedures)
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Welding of disimilar metals can be challenging due to the individual properties, including melting temperatures and chemical compositions of the various metals. This is complicated more if one or more of the disimilar metals is a composite material. By analyzing the microstructure and the heat affected zone (HAZ), the quality, strength and properties of the metal interface can be examined.
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 |
|---|---|---|---|---|---|---|
| 70 micron diamond grinding disk* |
Water | 5-10 lbs | 200/200 rpm | Planar |
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| 30 um DIAMAT diamond suspension on CERMESH Metal 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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| SiC-Titanium / Carbon-steel Weld, 200X, Etched Sarajan's Reagent (73% DI water, 16% HF, 6% HNO3, 5% HCl) |
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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