Improvements on the mechanical properties and thermal shock behaviours of MgO-spinel composite refractories by ZrO2 incorporation

CEYLANTEKİN R., AKSEL C.

CERAMICS INTERNATIONAL, vol.38, no.2, pp.995-1002, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 38 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.1016/j.ceramint.2011.08.022
  • Journal Name: CERAMICS INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.995-1002
  • Keywords: Mechanical properties, Thermal shock resistance, MgAl2O4, Zirconia, MAGNESIA, FRACTURE, PERFORMANCE, SIZE
  • Anadolu University Affiliated: Yes

Abstract

Microstructural features and improvements on the mechanical properties and thermal shock behaviours of MgO-spinel composite refractories with ZrO2 addition were examined. ZrO2 incorporation into MgO-spinel led to improvements around similar to 1.5-fold ratios on mechanical properties, R-st values and thermal shock results. The basic parameters improving mechanical properties and thermal shock resistance of MgO-spinel-ZrO2 composite refractories were determined as follows: (i) propagation of microcracks for a short distance by interlinking each other, (ii) stopping or deviation of microcracks when reaching pores or ZrO2 particles, (iii) concurrent occurrence of mostly intergranular and some transgranular cracks on fracture surfaces, and with the addition of ZrO2 (iv) the increase in bulk density, and (v) a significant decrease in MgO grain size. The improvements observed in thermo-mechanical properties confirmed that MgO-spinel-ZrO2 refractories showed a low strength loss and high thermal shock damage resistance at high temperatures, leading to longer service lives for using industrial applications. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.