Controlled amorphous crystallization: An easy way to make transparent nanoceramics

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• 作者：Lin Mei^a ; ^b ; Guang-Hua Liu^a ; Gang He^a ; ^b ; Li-Li Wang^c ; Jiang-Tao Li^a ; ^{ljt0012@vip.sina.com}
• 关键词：Nanoceramics ; Amorphous sintering ; Controlled crystallization ; Optical properties ; Mechanical properties
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：April, 2012
• 卷：34
• 期：6
• 页码：981-985
• 文件大小：763 K

摘要

Fabrication of transparent nanoceramics is attracting more and more interests recently. In this study a new method of amorphous sintering followed by controlled crystallization (ASCC) was developed, and transparent LaAlO₃/t-ZrO₂ nanoceramic was prepared as an example. Based on a eutectic composition of Al₂O₃-La₂O₃-ZrO₂, glass powders were synthesized, sintered, and then converted to nanoceramics by post-heat-treatment. The heat-treatment performed at 1200 掳C for 2 h produced a transparent LaAlO₃/t-ZrO₂ nanoceramic with an average grain size of 40 nm. Due to the nanoscale microstructure, the ceramic showed a transparency up to 55%at 800 nm (1 mm thick), Vickers hardness of 19.05 GPa, and fracture toughness of 2.64 MPa m^1/2, respectively.