Testing glaze stress under true practical conditions
Separate measurement of the expansion behavior of ceramic bodies and the glaze cannot record the effects of interactions and formation of intermediate layers that occur in practice. In the GSF glaze stress tester, a glazed rod is subjected to stress during heating and cooling and the bending that results is recorded. The direction and extent of bending make it possible to estimate the tensile and compressive stress and to define the temperature ranges over which pronounced changes in the state of stress occur during firing of a glazed ceramic. The application is the same for enameled metal articles.
The target applications for the GSF glaze stress tester are primarily in production control for glazed ceramic articles and associated glaze processing.
Key Technical Data
Temperature range: RT to 1400°C
Heating and cooling rates: 0.01 K/min to 20 K/min can set, intelligent control.
Sample holder: metal (screw clamping)
Measuring system: LVDT
Measuring range: 5000 µm for bending
Sample size: length 260 mm, width approx. 12 mm, thickness approx. 6 mm
Middle part approx. 80 mm glazed (other dimensions possible)
Atmospheres: air, static
The GSF runs under GSF Software on Windows®. The GSF Software includes everything you need to carry out a measurement and evaluate the resulting data. Through the combination of easy-to-understand menus and automated routines, a tool has been created that is extremely user-friendly and, at the same time, allows sophisticated analysis. The GSF Software is licensed with the instrument and can of course be installed on other computer systems.
Presentation of the relative bending (reference value for the zero point for stress evaluation is the complete softening of the glaze)
Semi-automatic routines for determination of the onset, peak and end temperatures
Derivation of the curves for determination of the temperature- or time-dependent rate of bending
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