Fracture behaviour of magnesia and magnesia-spinel composites before and after thermal shock

Aksel C., Warren P., Riley F.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol.24, no.8, pp.2407-2416, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 8
  • Publication Date: 2004
  • Doi Number: 10.1016/j.jeurceramsoc.2003.07.005
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2407-2416
  • Keywords: fracture toughness, MgAl2O4, MgO, modulus, refractories, strength, thermal shock, work of fracture, MECHANICAL-PROPERTIES, SURFACE-ENERGY, CERAMICS, BRICK, SIZE
  • Anadolu University Affiliated: No


Microstructural changes, as a consequence of the thermal expansion mismatch between magnesia and spinel phases, and fracture behaviour of magnesia and spinel composites have been investigated as a function of spinel content (10, 20, 30 wt.%). Fracture surfaces of magnesia showed mostly transgranular fracture; for the composites, however, the amount of intergranular fracture increased with increasing spinel content. This change in fracture behaviour is thought to be the main reason for the increase in the work of fracture, gamma(WOF). The 30% spinel composite was found to exhibit both the greatest resistance to crack propagation, and the greatest resistance to thermal shock damage, with the highest retained strength after quenching. (C) 2003 Elsevier Ltd. All rights reserved.