Fabrication of Ceramics Nano-Composites by Casting of Eutectic Melts in Multi-Component Systems

通过在多组分系统中铸造共晶熔体制备陶瓷纳米复合材料

• 批准号: 18360313
• 负责人: YOSHIMURA Masahiro
• 金额: $ 11.17万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360313/
• 关键词: eutectic; Al_2O_3; melting; casting; composite ceramics; amorphous; transparent; nano-composites; セラミックス; ナノコンポジット; 融体; ガラス; 透明セラミックス; C_<12>A_7; ナノ材料; 構造・機能材料; 材料加工・処理; 生体材料

[I]Major Establishments(1)The preparation of transparent bulk ceramics by melting/casting of eutectic melt in the ternary system Al_2O_3-HfO_2-GdAlO_3, and fabrication of ternary nano-composite ceramics by appropriate annealing of them (Papers 1 & 3).(2) The preparation of transparent bulk materials from the eutectic melt in pseudo-binary C_<12>A_7-CoYAlO_4 system in the ternary system Al_2O_3-CaO-Y_2O_3, and the fabrication of binary nano-composites by appropriate annealing of them (Papers 2,4 & 11).(3)The computer simulation can depict the solidification of the melts in these systems, thus explains their Nano-/Meso-/Micro-structures (Papers 5-8).(4)Those amorphous matrices and/or the ternary compound CaLaGaO_4 can be formed as a red phosphor by doping Eu (Papers 3,9 & 10).[II]Their ImportanceCeramics nano-composites have generally been fabricated from mixed powders by solid state processes : (1) Synthesis of them by solid state reactions, (2) the dispersion of powders, (3) molding of powders, (4) firing for sintering. Those processes are difficult to prepare homogeneous products and nano-structure controlled ones, because higher temperature firing would bring about the grain growth of every phase.The present research, on the other hand, (1) makes the homogeneous eutectic melts, (2) casts in a mold with the desired shape to fabricate the amorphous bulk, then (3) anneals to result in the nano-structures materials. Therefore, transparent nano-structured composites, which were very difficult to fabricate from powders by sintering, can be produced.Moreover, the solid solution samples with multi-components with homogeneous compositions can be produced by this method easily. The present method using melt/cast of eutectic melts, therefore, could be evaluated an innovative method for nano-composites ceramics. It was awarded as one of the best poster award (Paper #3) and the cover page of an International Journal (Paper #1).

[I]主要成果(1)三元体系Al_2O_3-HfO_2-GdAlO_3共晶熔体熔铸制备透明块体陶瓷，并通过适当退火制备三元纳米复合陶瓷（论文1、3） (2)伪二元共晶熔体制备透明块体材料三元体系Al_2O_3-CaO-Y_2O_3中的C_<12>A_7-CoYAlO_4体系，以及通过适当退火制备二元纳米复合材料（论文2,4和11）。（3）计算机模拟可以描绘凝固过程这些系统中熔体的变化，从而解释了它们的纳米/介观/微观结构（论文5-8）。（4）那些无定形基体和/或三元化合物 CaLaGaO_4 可以通过掺杂 Eu 形成红色荧光粉（论文 3,9 和 10）。[II]它们的重要性陶瓷纳米复合材料通常是通过固态工艺由混合粉末制成的：（1 ）通过固相反应合成，（2）粉末分散，（3）粉末成型，（4）烧成烧结。这些工艺很难制备均匀的产品和纳米结构控制的产品，因为较高的温度烧成会导致各相的晶粒长大。另一方面，目前的研究，（1）制造均匀的共晶熔体，（2）在具有所需形状的模具中铸造以制造非晶块，然后（3）退火以产生纳米结构材料。因此，可以生产很难通过烧结从粉末制备的透明纳米结构复合材料。此外，通过该方法可以容易地生产具有均匀成分的多组分固溶体样品。因此，使用共晶熔体的熔化/铸造的本方法可以被评估为纳米复合陶瓷的创新方法。它被授予最佳海报奖（论文#3）和国际期刊封面奖（论文#1）之一。

项目成果

Structural Characterization of CeO2−MO2 (M = Si4+, Ti4+, and Zr4+) Mixed Oxides by Raman Spectroscopy, X-ray Photoelectron Spectroscopy, and Other Techniques

通过拉曼光谱、X 射线光电子能谱和其他技术对 CeO2–MO2（M = Si4、Ti4 和 Zr4）混合氧化物进行结构表征

• DOI: 10.1021/jp0358376
• 发表时间: 2003-09-18
• 期刊: Journal of Physical Chemistry B
• 影响因子: 3.3
• 作者: Benjaram M. Reddy;Ataullah Khan;Yusuke Yamada;Tetsuhiko Kobayashi;Stéphane Loridant;J. Volta
• 通讯作者: J. Volta

Melt Synthesis of Oxide Phosphors with K_2NiF_4 Structures: CaLa_Eu_xGaO_4

熔融合成具有K_2NiF_4结构的氧化物荧光粉：CaLa_<1-x>Eu_xGaO_4

• 发表时间: 2008
• 作者: Tadashi ISHIGAKI; KenjiTODA; Tomoaki WATANABE; Naonori SAKAMOTO; Nobuhiro MATSUSHITA;Masahiro YOSHIMURA
• 通讯作者: Masahiro YOSHIMURA

Theoretical Study of Solidified Sample Influenced by Melt Superheat

熔体过热影响凝固样品的理论研究

• 发表时间: 2006
• 作者: Zoran S. Nikolic;Masahiro Yoshimura
• 通讯作者: Masahiro Yoshimura

Melt Synthesis of Oxide Phosphors with K_2NiF_4 Structures : CaLa1-xEu_xGaO_4

熔融合成具有 K_2NiF_4 结构的氧化物荧光粉：CaLa1-xEu_xGaO_4

• 发表时间: 2008
• 作者: Tadashi; ISHIGAKI; KenjiTODA; Tomoaki; WATANABE; Naonori; SAKAMOTO; Nobuhiro; MATSUSHITA; Masahiro; YOSHIMURA
• 通讯作者: YOSHIMURA

Why have we studied on the Direct Fabrication Processes of Ceramics from Solutions and/or Melts

为什么我们研究从溶液和/或熔体直接制造陶瓷的工艺

• 发表时间: 2007
• 作者: Masahiro; YOSHIMURA
• 通讯作者: YOSHIMURA