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SiC particles in Aluminum Matrix (MMC) Specimen Preparation
(Class 9 Procedures)

Metallographic Class 9 sample preparation


Hard particles in a metal matrix can be difficult to microstructurally prepare because of particle pull-out as well as excessive relief between the particles and the matrix. The key to preparation of metal matrix composites (MMC) is to minimize damage at each preparation stage. This includes sectioning with the appropriate diamond wafering blade and using the finest practical abrasive for initial grinding. Polishing with SIAMAT colloidal silica 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 in a minimal amount of time.

SECTIONING

Diamond Wafering blade - medium grit / high 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

Until plane

 
30 um DIAMAT diamond suspension on CERMESH Metal Mesh cloth   5-10 lbs

200/200 rpm

5 minutes Metallographic individual polishing force
9 um DIAMAT diamond on POLYPAD polishing pad   5-10 lbs

200/200 rpm

5 minutes Metallographic individual polishing force

3 um DIAMAT diamond on GOLDPAD or ATLANTIS polishing pad

SIAMAT colloidal silica

5-10 lbs

200/200 rpm

5 minutes

Metallographic individual polishing force

SIAMAT Colloidal silca on TEXPAN polishing pad

 

5-10 lbs

100/100 rpm

5 minutes

Metallographic individual polishing force
*Required for central polishing force. Click here for more information on central vs. individual polishing force polishing.

Metallographic micrograph of SiC-aluminum MMC composite

SiC particles in an Aluminum Matrix, 400X (DIC)

ETCHING

Common Etchants
PACE Technologies Recommended Etchants

PACE Technologies Etchant Database

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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3601 E. 34th St.
Tucson, Arizona 85713
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FAX +1-520-882-6599
email: pace@metallographic.com
www.metallographic.com


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Metallographic
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