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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

基本信息

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

项目摘要

[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).

（1）采用Al_2O_3-HfO_2-GdAlO_3三元系共晶熔体熔铸法制备透明块体陶瓷，并通过适当的热处理制备三元纳米复相陶瓷（论文1、3）。(2)从三元系Al_2O_3-CaO-Y_2 O_3中的伪二元C_ A_7-CoYAlO_4系共晶熔体制备透明块体材料<12>，并通过适当的退火制备二元纳米复合材料（论文2，4，11）。（3）计算机模拟可以描述这些体系中熔体的凝固过程，从而解释它们的纳米/介观/微观结构（论文5-8）。（4）这些非晶基质和/或三元化合物CaLaGaO_4可以通过掺杂Eu形成红色荧光体（论文3，9&10）。[II]它们的重要性陶瓷纳米复合材料通常是由混合粉末通过固态工艺制备的：（1）通过固态反应合成它们，（2）粉末的分散，（3）粉末的成型，（4）烧结。而本研究采用的方法是：（1）制备均匀的共晶熔体，（2）在具有所需形状的模具中浇铸，制备非晶块体，（3）退火，制备纳米结构材料。因此，该方法不仅可以制备出粉末烧结难以制备的透明纳米复合材料，而且可以制备出成分均匀的多组分固溶体样品。因此，本方法使用共晶熔体的熔融/浇铸，可以评价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（论文#1）。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Theoretical Study of Solidified Sample Influenced by Melt Superheat

熔体过热影响凝固样品的理论研究

DOI：
发表时间：
2006
期刊：
Physical Chemistry 2006
影响因子：
0
作者：
Aoi Sugiyama;Shunji Araki;Naonori Sakamoto;Tomoaki Watanabe;and Masahiro Yoshimura;Zoran S. Nikolic and Masahiro Yoshimura
通讯作者：
Zoran S. Nikolic and Masahiro Yoshimura

Melt Synthesis of Oxide Phosphors with K_2NiF_4 Structures: CaLa_<1-x>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

DOI：
发表时间：
2008
期刊：
J. Mater. Sci., Proc. of ISRS-16, 2007.6.3-6, Minneapolis, USA(accepted 08.1.19))
影响因子：
0
作者：
Tadashi ISHIGAKI;KenjiTODA;Tomoaki WATANABE;Naonori SAKAMOTO;Nobuhiro MATSUSHITA;and Masahiro YOSHIMURA
通讯作者：
and Masahiro YOSHIMURA

Fabrication of crack-free C12A7 nano-ceramics composite from eutectic glass in the C12A7-CaYAlO4 system

C12A7-CaYAlO4 体系中共晶玻璃制备无裂纹 C12A7 纳米陶瓷复合材料