Heating microscopes are used for studying the softening of the materials as they melt (especially frits). It is employed to determine the characteristic softening, sphere, half-sphere, glass transition and melting temperatures and its data can be evaluated to produce the material flattening curve, the contact angle curve, the specimen area variation curve and the viscosity curve. Surface tension values at high temperatures and the calculation of the surface tension are also possible.
The Chemistry, Physics and Manufacturing of Glaze Frits
A detailed discussion of the oxides and their purposes, crystallization, phase separation, thermal expansion, solubility, opacity, matteness, batching, melting.
Example of a heating microscope
Glass Transition Temperature
In ceramic glasses (usually frits) the temperature at which the hard brittle state of the glass changes to the rubber-like state that precedes softening and melting
|By Tony Hansen
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