The effect of SnO₂ on the improvement of mechanical properties of MgO-MgAl₂O₄ composites

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• 作者：Pinar Ugur ^{pugur1982@gmail.com} ; Cemail Aksel ; ^{caksel@anadolu.edu.tr}
• 关键词：A. Ceramic&ndash ; matrix composites (CMCs) ; B. Mechanical properties ; B. High-temperature properties ; B. Microstructures ; SnO2
• 刊名：Composites Part B ; Engineering
• 出版年：2012
• 期刊代码：18_13598368
• 类别：ms
• 出版时间：July, 2012
• 卷：43
• 期：5
• 页码：2217-2221
• 文件大小：1157 K

摘要

Incorporation of SnO₂ into MgO-spinel (M-S) increased mechanical properties significantly. Relationships between the parameters improving mechanical properties and microstructural variables were examined. Basic parameters improving the mechanical properties of M-S-SnO₂ composites were identified as follows: (a) when microcracks come across with either Mg₂SnO₄ particles or pores; crack branching and deviation of interlinked microcracks or crack arresting occurred more effectively than those of spinel particles, (b) fracture type was converted to intergranular fracture with incorporation of spinel into MgO, and transgranular fracture with addition of SnO₂ to M-S; additionally with the incorporation of additives, (c) critical defect size, (d) work of fracture values increased, and (e) MgO grain size decreased. R_st thermal shock parameter values of M-S-SnO₂ composites were markedly higher than those of M-S materials, associated with low strength loss, high thermal shock damage resistance and thus longer service life of M-S-SnO₂ composites for high-temperature industrial applications.