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Nickel-Zinc Ferrite Specimen Preparation
(Class 4 Procedures)

Metallographic Class 4 sample preparation


Ferrite ceramics produce one of the strongest types of magnetics, and consist of iron, boron and barium, or strontium and molybdenum. A ferrite material is a ceramic magnet which has high magnetic permeability, which allows it to store stronger magnetic fields than iron.

Specimen preparation of friable or brittle materials such as ferrites can be difficult. Proper microstructural preparation of these materials must maintain the structure of the Ni-Fe ferrite structure. This is accomplished by mounting the ferrite in a castable mounting compound such as epoxy. Initial grinding with a 320 grit or finer SiC paper is required to prevent pulling out the ferrite particles, especially the smaller particles. Rough polishing is accomplished on woven polishing cloths using diamond, with final polishing on high napped cloth using a polycrystalline alumina abrasive.

SECTIONING

Diamond wafer cutting with medium grit / low concentration diamond blades

MOUNTING

Castable mounting acrylics or epoxies

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

Individual
Force mode

Central Force
mode

240 grit SiC paper*

Water

5-10 lbs

200/200 rpm

Until plane

 

360 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit SiC paper

Water

5-10 lbs

200/200 rpm

1 minute
1 minute
1 minute
1 minute

Metallographic individual polishing force

1 um DIAMAT diamond on ATLANTIS polishing pad

SIAMAT Colloidal Silica

5-10 lbs

200/200 rpm

5 minutes

Metallographic individual polishing force

0.05 um Nanometer alumina on NAPPAD polishing pad

 

5-10 lbs

100/100 rpm

1 minute

Metallographic individual polishing force

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

Metallographic micrograph of Ni-Zin ferrite

Ni-Zn ferrite, 400X (B.F.), 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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email: pace@metallographic.com
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Metallographic
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