TY - JOUR
T1 - The flow of glass at high stress levels. II. The effect of phase separation on viscosity
AU - Li, J. H.
AU - Uhlmann, D. R.
N1 - Funding Information:
The authors wish to express their appreciation to Dr. R. R. Shaw of the American Optical Company and to Professor J. Breedis of M.I.T. for carrying out the electron microscope observations; to Professor M. Goldstein of Yeshiva University for directing our attention to the effects of the variation of viscosity with composition; to Mr. D. Guernsey of M.I.T. for carrying out the chemical analyses; and to the U.S. Atomic Energy Commission who provided financial support for the work under Contract AT (30-1) 3773.
PY - 1970/3
Y1 - 1970/3
N2 - The effects of phase separation on the viscosity of glass-forming liquids has been investigated using a fiber-elongation technique. The materials studied were a borosilicate glass and a 0.14 Na2O·0.86 SiO2 glass. In the latter case, the viscosity has been measured at temperatures of 501 and 555 °C, and found to depend strongly on the extent, scale, and morphology of the phase separation. The faster development of a large-scale interconnected submicrostructure at 555 °C has been associated with the viscosity of samples tested at this temperature being higher than those at 501 °C, for tests up to about one mouth in duration. The borosilicate glass was tested at temperatures of 536, 482, 460, and 448 °C. In contrast with the results obtained previously on a homogeneous rubidium silicate glass, no evidence for non-Newtonian behavior was found on this phase-separated glass, even for tensile stresses as large as 2.3 × 1010 dyne/cm2.
AB - The effects of phase separation on the viscosity of glass-forming liquids has been investigated using a fiber-elongation technique. The materials studied were a borosilicate glass and a 0.14 Na2O·0.86 SiO2 glass. In the latter case, the viscosity has been measured at temperatures of 501 and 555 °C, and found to depend strongly on the extent, scale, and morphology of the phase separation. The faster development of a large-scale interconnected submicrostructure at 555 °C has been associated with the viscosity of samples tested at this temperature being higher than those at 501 °C, for tests up to about one mouth in duration. The borosilicate glass was tested at temperatures of 536, 482, 460, and 448 °C. In contrast with the results obtained previously on a homogeneous rubidium silicate glass, no evidence for non-Newtonian behavior was found on this phase-separated glass, even for tensile stresses as large as 2.3 × 1010 dyne/cm2.
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U2 - 10.1016/0022-3093(70)90176-6
DO - 10.1016/0022-3093(70)90176-6
M3 - Article
AN - SCOPUS:0038008654
SN - 0022-3093
VL - 3
SP - 205
EP - 224
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 2
ER -