T. Michimata et K. Matusita, VISCOSITY MEASUREMENT OF GLASS MELT BY A UNIFORM SPEED PENETRATION VISCOMETER IN THE RANGE OF 10(2)-10(8)-PA-CENTER-DOT-S, Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 105(7), 1997, pp. 620-623
A new viscometer, uniform speed penetration viscometer, was constructe
d with which the viscosity of glass melts can he measured in the range
of 10(2)-10(8) Pa.s, a pin dipped in the melt was penetrated into the
melt with a uniform speed and the viscous drag an the pin was measure
d. A calibration curve between the viscous drag and viscosity was prep
ared using NBS711 glass as a standard material. The viscosity of glass
melt can be determined from the measured viscous drag and the calibra
tion curve. It was ascertained that the viscosities of lead-silicate g
lasses can be measured by this viscometer in the range of 10(2)-10(8)
Pa.s, and that they agree well with the Littelton point measured by an
other method. The limits of measurement at high and low viscosities we
re analyzed and discussed basad on the interface phenomena between the
pin and the melt.