Viscosity and thermal evolution of density and wetting angle of a commercial glaze by means of hot stage microscopy

FRANCO MATÍAS STÁBILE; MARTINIANO PICCICO; MARÍA FLORENCIA SERRA; MATÍAS RAFTI; GUSTAVO SUAREZ; NICOLÁS MAXIMILIANO RENDTORFF

Procedia Materials Science

Elsevier

Año: 2015 vol. 9 p. 563 - 570

In the present work we attempt to describe the results of the thermal behavior analysis of a commercial glaze obtained in athermal microscope developed by the research group. At the same time, the density and the wetting angle of the glaze with analumina surface was evaluated. Particularly the sintering temperature, the sphere, semi-sphere and fusion temperatures were alsodetermined. These present characteristic viscosities. Afterward, by means of the de Vogel-Fulcher-Tammann equation, theviscosity as a function of temperature was estimated.In the first part the developed equipment is described together with the image analysis carried out for the in-situ cylindricalsamples (2,5 mm of height and diameter). The thermal cycle was up to 1200ºC with a heating rate of 5ºC/min. The developedequipment presents the following characteristics: some problems with the temperature evaluation, it was slightly affected by aircurrents and difficulties for achieving an adequate parallelism. On the other hand, the potentialities of the equipment fordevelopment and study of the thermal behavior of glasses was established.