Measurement of Viscosity of Densifying Glass-Based Systems by Isothermal Cyclic Loading Dilatometry

Aravind Mohanram, Gary L. Messing, David J. Green

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


This study describes the isothermal cyclic loading dilatometry (ICLD) technique to measure the viscosity of glass-based materials. We demonstrate its merit relative to constant-load techniques in minimizing the stress history effects (changes in shrinkage anisotropy and sample microstructure) that arise due to the application of an external load. A constant-load test overestimates the viscosity by an order of magnitude compared with a cyclic load test. To obtain accurate viscosity data, maximum loading rates and longer unloading periods are desirable as they reduce effects of shrinkage anisotropy on viscosity values. Representative data for a low-temperature cofired ceramic (LTCC) material are reported. Nonparametric statistical tests revealed insignificant differences between the viscosity data sets at 5% significance level and thus indicate good reproducibility of the testing methodology.

Original languageEnglish (US)
Pages (from-to)192-196
Number of pages5
JournalJournal of the American Ceramic Society
Issue number2
StatePublished - Feb 2004

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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