Ceramics of Ta-doping stabilized orthorhombic ZrO₂ densified by spark plasma sintering and the effect of post-annealing in air

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• 作者：Gabriele Sponchia^a ; Bibi Malmal Moshtaghioun^b ; Alvise Benedetti^a ; Pietro Riello^a ; Diego Gó ; mez-Garc&iacute ; a^b ; ^c ; Arturo Dom&iacute ; nguez-Rodr&iacute ; guez^b ; Angel L. Ortiz^d ; ^{alortiz@unex.es}
• 关键词：ZrO2 ceramics ; Orthorhombic polymorph ; Ta doping ; Spark-plasma sintering ; Post-sintering annealing
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：128-132
• 全文大小：1630 K
• 卷排序：130

文摘

16 mol% Ta-doped ZrO2 powders were synthesized and densified by spark-plasma sintering (SPS) in vacuum, followed by post-SPS annealing in air, thus obtaining two ultrafine-grained ceramics consisting of Ta-doping stabilized orthorhombic ZrO2. The as-SPSed ceramic is black because it is actually a suboxide essentially with reduced cations and abundant oxygen vacancies, whereas the post-annealed ceramic is white because it is an oxide without vacancies and with only partially reduced cations. Both ceramics are relatively hard and brittle, but the as-SPSed ceramic was slightly more so, attributable to crystallographic and microstructural differences. Implications of interest for the ceramics community are discussed.