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see also:
Correction
of Indium Melting Peak
Measured are the melting peaks of pure aluminum and an
aluminum alloy, using a NETZSCH DTA 404 and an alumina
crucible.
Conditions of
measurements
The raw DTA curve of aluminum melting peak shows the typical
shape:
A nearly linear increasing of the low temperature side and
an exponential decrease after the maximum. The peak is very
broad.
After corrections regarding time constant and thermal
resistance the width of this peak is dramatically reduced,
resulting also in a well defined solid-liquid transition,
visible on the sharp increase and very fast transition in
the constant value of partial area.
Without any correction,
the melting peak of the aluminum alloy (green line) is
broad. The melting peaks of eutectics are only small
"hills".
After application of the
program DSC/DTA Correction, which corrects the measurement
regarding time constant and thermal resistance of the device
(red line), the melting peaks of eutectics are clearly
visible and the melting peak of aluminum is very small,
resulting in a well-defined transition edge from the solid
to the liquid (blue line of partial area).
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