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A Rapid Torsion Method for Measuring the Viscosity of Silica Glasses up to 2200°C
Author(s) -
WEISS WERNER
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb19745.x
Subject(s) - torsion (gastropod) , glass tube , materials science , strips , tube (container) , composite material , viscosity , atmospheric temperature range , rotational speed , mechanics , optics , mineralogy , thermodynamics , chemistry , classical mechanics , physics , medicine , surgery
A thin, heated glass rod fixed at one end is quickly rotated around its axis in a small vertically positioned tube furnace. A computer is used to determine the temperature‐viscosity correlation by solving an integral equation from the measurement of the torsion moment, the speed of rotation, the diameter of the rod, and the knowledge of the temperature profile inside the tube. The advantages of this new method are the small sample mass of about 0.5 g, the fast measurement procedure, the possibility of using high temperatures, and the fact that there is no contact of the sample with any solid materials. Also, lengthwise strips made of glass tubings can be used. Some examples of measuring the viscosities in the working range of 10 5 to 10 10 dPa. s of commercial silica glasses up to 2200°C are shown. Maximum deviations of ±14 K are possible.