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Hafnium Diboride in a Boron Nitride Matrix (CMC) Specimen Preparation

Metallographic etchant database

Specimen preparation of hard/brittle ceramic matrix composites materials can be challenging. The key to the preparation of ceramics and ceramic-ceramic composites 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 / 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
9 um DIAMAT diamond on POLYPAD polishing pad DIALUBE Purple Extender 5-10 lbs

200/200 rpm

5 minutes
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 BLACKCHEM 2 polishing pad

 

10 lbs

100/100 rpm

5 minutes



Metallograhic micrograph of hafnium diboride in boron nitride matrix

Hafnium Diboride in a Boron Nitride Matrix

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