Co-efficient of Linear Expansion - COLE
This test procedure was employed in the Foresight Ceramic Database and now is available for those having an account at Insight-Live.com. Accumulating test data using the variables defined in these procedures enables us to create tools that enable you to compare the physical properties of materials and recipes.
Most solids expand as they are heated. This expansion occurs in microscopically small amounts and can be observed along a line (linear), across an area and volumetrically. Since ceramics are brittle materials uneven changes in expansion across a cross section or incompatible expansions across joints or between body and glaze can cause ware failure.
VAL - Value (V)
Simple dilatometric curve produced by a dilatometer
Dialometric chart produced by a dilatometer. The curve represents the increase in thermal expansion that occurs as a glass is heated. Changes in the direction of the curve are interpreted as the transformation (or transition) temperature, set point and softening point (often quoted on frit data sheets). When the thermal expansion of a material is quoted as one number (on a data sheet), it is derived from this chart. Since the chart is almost never a straight line one can appreciate that the number is only an approximation of the thermal expansion profile of the material.
Out Bound Links
In Bound Links