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Optimization of sintering processes for porcelain using in- situ measuring methods

: Dannert, C.; Durschang, B.; Raether, F.; Becker, F.H.

Glass Science and Technology 76 (2003), S.71-77
ISSN: 0017-1085
ISSN: 0946-7475
Fraunhofer ISC ()

By monitoring the thermal conductivity of ceramic materials during sintering, direct insight into the microstructural evolution can be gained. Using an in-situ thermooptical measuring system for measurement of thermal conductivities and densification rates and a high-temperature X-ray diffractometer, sintering mechanisms of porcelain have been examined. For the investigation of fast biscuit and glost firing cycles of whiteware, a firing process of a continuosly gas fired kiln with a firing atmosphere containing water vapour was simulated in a resistance heated laboratory furnace. The sintering properties deviate significantly from results obtained in dry air. From densification data, a "kinetic field" for the glost firing of whiteware has been set up to calculate optimal fast firing cycles and to determine the activation energy for the densification. The activation energy increases in the intermediate sintering stage.