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Slag Specimen Preparation
(Class 11 Procedures)

Metallographic Class 11 sample preparation


Proper microstructural preparation of slags requires proper cutting or sectioning with a fine grit diamond blade (Figure 1 and 2). If the slag (glass) is chipped or excessively cracked during sectioning it may be impossible to remove the damage.

Planar grinding is best accomplished with a semi-fixed diamond on a metal mesh cloth. Intermediate grinding and polishing is accomplished by combining the mechanical component of diamond abrasives with the chemical polishing effect of colloidal silica. Final polishing on a resilient polishing pad such as BLACK CHEM using SIAMAT colloidal silica produces a damage free surface ready for examination (Figure 3).

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

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

200/200 rpm

Until plane
6 um DIAMAT diamond on TEXPAN polishing pad SIAMAT colloidal silica 10 lbs

200/200 rpm

5 minutes

1 um DIAMAT diamond on GOLDPAD polishing pad

SIAMAT colloidal silica

10 lbs

200/200 rpm

5 minutes

SIAMAT Colloidal silca on TEXPAN polishing pad

 

10 lbs

100/100 rpm

5 minutes


Metallographic cutting with fine grit diamond wafering blade   Metallographic diamond cutting with incorrect wafering blade

Figure 1. Fine grit diamond cut of glass

 

Figure 2. Medium grit diamond cut of glass


Metallographic micrograph of slag

Slag, 100X (Polarized light), as polished condition

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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Tucson, Arizona 85713
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email: pace@metallographic.com
www.metallographic.com


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