The effect of mullite on the mechanical properties and thermal shock behaviour of alumina-mullite refractory materials

Aksel C.

CERAMICS INTERNATIONAL, vol.29, no.2, pp.183-188, 2003 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 2
  • Publication Date: 2003
  • Doi Number: 10.1016/s0272-8842(02)00103-7
  • Journal Name: CERAMICS INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.183-188
  • Keywords: mechanical properties, alumina, mullite, refractory, thermal shock, COMPOSITES
  • Anadolu University Affiliated: No

Abstract

Mechanical properties and thermal shock behaviour of slip-cast alumina-mullite refractories have been investigated. There was a marked improvement in strength, Young's modulus and fracture toughness values with the addition of finest (approximately 5 mu-m) mullite particles. The shorter length needle-like mullite particles led to some pull-out and crack deflection. More fracture surface energy was therefore required to connect the cracks for propagation, resulting in a high value of fracture toughness. The resistance to fracture initiation and propagation caused by the thermal stresses was increased, as supported by the R and R-st parameters. Therefore, the retained strength was improved by increasing the quench temperature, showing a high resistance to thermal shock. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.