Structural, morphological and mechanical investigations of in situ synthesized c-CeO₂/α-Al₂O₃ composites

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• 作者：Atul Kumar Ojha ; V. Ponnilavan ; S. Kannan ; ^{para_kanna@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：c-CeO2 ; α-Al2O3 ; Composites ; Morphology ; Indentation
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：686-692
• 全文大小：1304 K

文摘

The development of c-CeO₂/α-Al₂O₃ composites targeted for load bearing orthopaedic applications was investigated. Three different c-CeO₂/α-Al₂O₃ compositional ratios were synthesized in situ and the results were compared with pure forms of both c-CeO₂ and α-Al₂O₃. The thermal stability of the c-CeO₂/α-Al₂O₃ composites depend on the individual precursor ratios and the particle morphology of c-CeO₂ intends to vary with respect to the Al₂O₃ content in the composites. The combined presence of Ce⁴⁺ and Ce³⁺ states leading to the formation of a super structured lattice was confirmed through TEM analysis. Ce³⁺ presence in c-CeO₂ led to its lattice expansion and any kind of Al³⁺ occupancy at the c-CeO₂ lattice was discarded from the present investigation. Moreover, the presence of excess c-CeO₂ in c-CeO₂/α-Al₂O₃ composites was found detrimental to the mechanical strength of the composites.