Elastic properties and surface damage resistance of nitrogen-rich (Ca,Sr)-Si-O-N glasses

Pathikumar Sellappan (1) , Ali Sharafat (2) , Vincent Keryvin (1, 3) , Patrick Houizot (4) , Tanguy Rouxel (1) , Jekabs Grins (2) , Saeid Esmaeilzadeh (2)

1 LARMAUR - LAboratoire de Recherche en Mécanique Appliquée
2 Department of Physical, Inorganic and Structural Chemistry, Arrhenius Laboratory
3 LIMATB - Laboratoire d'Ingénierie des Matériaux de Bretagne
4 ISCR - Institut des Sciences Chimiques de Rennes

Ca and Sr-based oxynitride glasses with very high nitrogen content have been synthesized using metal hydrides as primary precursors. Values of Young's modulus, shear modulus, bulk modulus and Poisson's ratio were determined by means of ultrasonic echography. Vickers micro-indentation has been used to characterize hardness and indentation fracture toughness behaviour. Elastic moduli were found to increase linearly with nitrogen content, with the highest value of Young's modulus at 135 GPa, for a Ca-glass with 58 e/o of nitrogen. The Sr-glasses exhibit lower elastic moduli than Ca glasses. Poisson's ratio, hardness, indentation fracture toughness, crack initiation load and surface damage resistance were found to increase with increasing nitrogen content for both glass series. (C) 2010 Elsevier B.V. All rights reserved.

Mots clés: Oxynitride glass; Elastic modulus; Poisson's ratio; Hardness; Brittleness; Fracture toughness; High nitrogen content

Domaines: Mécanique [physics.med-ph]

Pathikumar Sellappan, Ali Sharafat, Vincent Keryvin, Patrick Houizot, Tanguy Rouxel, et al.. Elastic properties and surface damage resistance of nitrogen-rich (Ca,Sr)-Si-O-N glasses. Journal of Non-Crystalline Solids, 2010, 356 (41-42), pp.2120-2126. ⟨10.1016/j.jnoncrysol.2010.07.043⟩. ⟨hal-00830343⟩