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Optical dilatometry for the control of microstructure development during sintering

 
: Raether, F.; Springer, R.; Beyer, S.

:

Materials research innovations 4 (2001), Nr.4, S.245-250
ISSN: 1432-8917
Englisch
Zeitschriftenaufsatz
Fraunhofer ISC ()

Abstract
An optical method for the in situ measurement of sintering shrinkage has been developed. It relies on a simple and robust CCD camera technique and is applicable up to high temperatures (2000 degreesC) and heating rates (10 K/min) in industrial furnace atmospheres. A resolution of less than 1 mum for a sample diameter of 10 mm has been achieved using a special geometrical arrangement and a smart image analysis algorithm. Systematic errors are small (<0.1%) and can be corrected by an additional measurement. A high reproducibility of shrinkage measurement has been observed in various sintering experiments. The optical dilatometer is very flexible: it has been used also for an accurate temperature calibration and for wetting experiments and it can be adjusted to different furnace types.

: http://publica.fraunhofer.de/dokumente/B-73032.html