The flow of glass at high stress levels. II. The effect of phase separation on viscosity

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)205-224
Number of pages20
JournalJournal of Non-Crystalline Solids
Volume3
Issue number2
DOIs
StatePublished - 1970
Externally publishedYes

Fingerprint

Phase separation
Viscosity
viscosity
Glass
Borosilicate glass
glass
borosilicate glass
Rubidium
Silicates
mouth
rubidium
tensile stress
Tensile stress
Temperature
elongation
temperature
Elongation
silicates
fibers
Fibers

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

The flow of glass at high stress levels. II. The effect of phase separation on viscosity. / Li, J. H.; Uhlmann, Donald R.

In: Journal of Non-Crystalline Solids, Vol. 3, No. 2, 1970, p. 205-224.

Research output: Contribution to journalArticle

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