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Thermal properties of calcium silicon oxynitride glasses
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET). (Glass group)
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET). (Glass group)
2015 (engelsk)Konferansepaper, Poster (with or without abstract) (Fagfellevurdert)
Abstract [en]

Oxynitride glasses are a branch of high performance glasses, obtained by incorporation of nitrogen atoms into oxide glass network. [1-3]Oxynitride glasses have superior mechanical, rheological and optical properties as compared to their oxide glass counter partner [2-5]. Properties of these glasses can be tailored by changes in nitrogen content and additions of various alkaline-earth and or rare-earth elements. Ca- Si-O-N glasses containing high amount of nitrogen and modifiers have been prepared by melting the mixture of CaH2, SiO2 and Si3N4 powder in nitrogen atmosphere. The glasses were characterized by X-ray powder diffraction, differential thermal analysis and scanning electron microscopy. The obtained glasses were found to be homogenous, and having colour opaque black[3]. These glasses show high values of glass transition temperature (1050°C), and crystallization temperatures (1150°C) measured by differential thermal analysis.  Generally the Ca-Si-O-N glasses thermal properties evolve approximately linearly with the nitrogen content. The viscosity increases significantly with the nitrogen content and reaches viscosity values close to reported values for rare-earth silica oxynitride glasses. The apparent viscosity activation energies are very high, ranging from 855 to 2170 kJ/mole. These nitrogen rich glasses can accordingly be classified as being both very refractory and very fragile.

 

sted, utgiver, år, opplag, sider
2015. Vol. PS2, s. 72-72
Emneord [en]
Oxynitride glass; Nitrogen content; thermal property; Glass transition temperature; Viscosity
HSV kategori
Forskningsprogram
Teknik, Glasteknologi
Identifikatorer
URN: urn:nbn:se:lnu:diva-51337OAI: oai:DiVA.org:lnu-51337DiVA, id: diva2:914655
Konferanse
3rd central and Eastern European Conference on Thermal Analysis and Calorimetry, 25-28 August, 2015, Ljubljana, Slovenia.
Tilgjengelig fra: 2016-03-24 Laget: 2016-03-24 Sist oppdatert: 2016-04-25bibliografisk kontrollert

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