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Viscosity of high-nitrogen content Ca-Si-O-N glasses

Abstract : The viscosity of three high-nitrogen content Ca-Si-O-N glasses, with 30-58 e/o N and 36-39 e/o Ca, was determined by micro-indentation. The measurements were made using an automated set-up, designed and built in-house, capable of measurements up to 1200 ◦ C with applied loads of 0.01-15 N. The viscosity increases significantly with the nitrogen content and reaches viscosity values close to reported values for rare-earth silica oxynitride glasses. The glass transition temperatures range between 878 and 995◦C and are in very good agreement with values measured by differential thermal analysis. The apparent viscosity activation energies are very high, ranging from 855 to 2170 kJ/mol. The glasses can accordingly be classified as being both very refractory and very fragile. Implications of the viscosity values and mechanical properties of the glasses for their structures are discussed.
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https://hal.archives-ouvertes.fr/hal-00676616
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Submitted on : Monday, March 5, 2012 - 5:12:06 PM
Last modification on : Wednesday, May 20, 2020 - 2:42:02 PM

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Yann Gueguen, Sharafat Ali, Grins Jekabs, Tanguy Rouxel. Viscosity of high-nitrogen content Ca-Si-O-N glasses. Journal of the European Ceramic Society, Elsevier, 2010, 30, pp.3455-3458. ⟨10.1016/j.jeurceramsoc.2010.07.039⟩. ⟨hal-00676616⟩

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