Heating Microscope Analysis for Frits - HMA
NotesInformation found at http://www.reimbold-und-strick.de/
This test is important in the assessment of materials for use in glass ceramics.
The heating microscope describes the melting of frits during the heating process. A cube of 3x3x3 mm is pressed of fine ground frit, is heated at 30 - 40°C/min (others specify 10°C/min) to 1400C. During this process characteristics of the silhouette are recorded.
These observations are referenced differently by some.
Variables
SP - Sintering Point (V)
At this temperature the height of the cylinder shrinks by 5%, also referred to as transformation point.
EP - Softening Point (V)
The beginning of softening: The temperature at which the corners show rounding.
K - Ball Point (V)
At this temperature the silhouette is similar to a sphere.
HK - Half-ball Point (V)
Temperature at which the height is half of the base. Interpreted at the melting temperature.
F - Liquid Point (V)
The sample has melted to 1/3 of its original height.
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