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Rhenium Alloy Specimen Preparation

Metallographic etchant database

Refractory metals such as Rhenium, Niobium, Tungsten and Molybdenum are a very soft, and any loose or fracture abrasive particles can easily embed. This makes specimen preparation very difficlut because it gums up diamond grinding disks or becomes embedded with fractured SiC particles when gound with SiC papers. The key to preparation of this material is to use the tougher alumina abrasive and to chemically etch the specimen between each grinding step. The purpose of etching is to remove the embedded particles and not carry them over as contamination.

SECTIONING
MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)

MOUNTING
Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins

POLISHING

Abrasive/surface

Lubricant

Force/ sample

Speed
(Head/base)

Time

P220 grit ALO paper
P500 grit ALO paper
P1200 grit ALO paper

Water

5-10 lbs

100/100 rpm

Until plane
1 minute
1 minute

1 micron DIAMAT diamond on ATLANTIS polishing pad

DIALUBE Purple Extender

5-10 lbs

100/100 rpm

1 minute

0.05 um acidic Nanometer acid alumina on a BLACKCHEM 2 pad

Polishing with 10% Diluted etchant below:

Rhenium - 30 ml lactic acid, 30 ml HNO3, 1 ml HF

 

5-10 lbs

100/100 rpm

1 minute


Metallography microsctructure for Rhenium

Rhenium (BF), etched

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