Developments on the mechanical properties of MgO-MgAl2O4 composite refractories by ZrSiO4-3 mol% Y2O3 addition

Sahin B., AKSEL C.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, cilt.32, sa.1, ss.49-57, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.jeurceramsoc.2011.07.024
  • Dergi Adı: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.49-57
  • Anahtar Kelimeler: MgO, Spinel, Zircon, Y2O3, Refractories, Mechanical properties, MAGNESIA-SPINEL COMPOSITES, THERMAL-SHOCK DAMAGE, RESISTANCE PARAMETERS, SURFACE-ENERGY, RIBBON TEST, FRACTURE, CERAMICS, BEHAVIOR, BRICK, SIZE
  • Anadolu Üniversitesi Adresli: Evet

Özet

Improvements and the effects of additions of ZrSiO4-3 mol% Y2O3 into MgO-MgAl2O4 composite refractories on mechanical properties and thermal stress resistance parameters were investigated. Significant improvements were achieved on mechanical properties and R-R-st parameters up to similar to 2 and similar to 3-fold ratios. The major parameters improving mechanical properties and thermal behaviour of refractories were determined as follows: (i) the increase in resistance to crack initiation and propagation due to formation of Mg2SiO4 phase after decomposition of zircon; (ii) propagation of the microcracks formed in the structure for a short distance by interlinking each other; (iii) arresting or deviation of microcracks when reaching pores or ZrO2 grains released after dissociation of zircon, located together with Y2O3 particles, and furthermore; (iv) co-presence of both intergranular and transgranular types of cracks, and with incorporation of zircon-Y2O3; (v) increase in density; and (vi) a significant reduction in MgO grain size. (C) 2011 Elsevier Ltd. All rights reserved.