Improvements on the thermal shock behaviour of MgO-spinel composite refractories by incorporation of zircon-3 mol%Y₂O₃

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• 作者：Cemail Aksel ; ^{caksel@anadolu.edu.tr} ; Tuba Aksoy
• 关键词：C. Thermal shock resistance ; D. MgAl2O4 ; ZrSiO4 ; Y2O3
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3673-3681
• 文件大小：1675 K

摘要

The effects of incorporations of zircon-3 mol%Y₂O₃ (Y) into MgO-spinel (M-S) compositions to improve mechanical properties and thermal shock behaviour were investigated. Mechanical properties were measured, R 鈭?#xA0;R_st parameters were calculated, and thermal shock tests were performed. Microstructural features were examined using SEM and XRD. By adding zircon + Y to M-S: (i) up to 鈭? and 鈭?-fold improvements were achieved in mechanical properties and R 鈭?#xA0;R_st parameters, (ii) there were improvements up to 鈭?-fold in strength data measured after performing thermal shock tests at 1000 掳C. Parameters improving mechanical properties and thermal shock behaviour of M-S-(zircon + Y) materials are given as follows: (i) interlinking and arresting or deviation of microcracks when reaching the ZrO₂-Y₂O₃ grains or pores, increases in (ii) K_Ic, (iii) critical defect size and (iv) bulk density, (v) formation of forsterite phase, (vi) coexistence of intergranular and transgranular fractures, and (vii) reduction in MgO grain size, leading to longer service life.