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Multilayer BaTiO3 Ceramic Capacitor Specimen Preparation
(Class 4 Procedures)

Metallographic Class 4 sample preparation


Ceramic capacitors are typically very small, inexpensive devices used in cell phones, MP3 players, computers and other electronic products. MLC devices are constructed of alternating layers of metal and ceramic, with the ceramic material acting as the dielectric.

Microstructural analysis of a BaTiO3 ceramic capacitor includes looking for missing metal layers, as well as for examining for any gaps and voids in the ceramic substrate. Microstructural preparation of multilayer BaTiO3 ceramic capacitors requires minimizing polishing relief and damage to the coating or ceramic substrate. This is accomplished by filling the existing voids with a castable resin under vacuum and then curing at a higher pressure. Initial grinding with alumina lapping films is required to open up the capacitor, as well as to minimize microstructural damage. Rough and final polishing are recommended on low napped woven polishing pads using diamond and colloidal silica, respectively.

SECTIONING

Not required

MOUNTING

Castable epoxy or acrylic resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

Individual
Force mode

Central Force
mode

45 um Alumina Lapping Film*
30 um Alumina Lapping Film*
Water 5-10 lbs

100/100 rpm

Until plane
1 minute

 

15 um DIAMAT diamond on POLYPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

3 minutes

Metallographic individual polishing force

6 um DIAMAT diamond on GOLDPAD polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

3 minutes

Metallographic individual polishing force

1 um DIAMAT diamond on ATLANTIS polishing pad

SIAMAT colloidal silica

5-10 lbs

100/100 rpm

2 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 BaTiO3 capacitor

BaTiO3 Multi-layer Ceramic Capacitor

Metallographic micrograph of BaTiO3 capacitor

BaTiO3 Multi-layer Ceramic Capacitor with void in metal layer

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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email: pace@metallographic.com
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