Development of high-temperature ceramic materials by controlling electronic structure at grain boundaries

通过控制晶界电子结构开发高温陶瓷材料

• 批准号: 11355028
• 负责人: SAKUMA Taketo
• 金额: $ 20.66万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11355028/
• 关键词: electronic structure; molecular orbital calculation; grain boundary; ceramics; alumina; transmission electron microscopy; creep; アルミナ; 耐熱性; 粒界微細構造; 分子軌道法

This project aims to examine electronic structure in grain boundaries high-temperature plastic flow in fine-grained oxide ceramic material such as alumina and zirconia. This project also aims to reveal a role of electronic structure in the vicinity of the grain boundaries in ceramics on the high-temperature mechanical property, and to develop a new theoretical method for fabricating ceramics for high-temperature use. During the research term from 1999 to 2001, we succeed in revealing role of electronic structure in the grain boundary for the high-temperature mechanical properties in ceramics, establishing the mechanisms of high-temperature deformation in terms of "grain boundary electronic structure", which is a new concept for controlling the physical properties in ceramics. One of our key topics of out results is that the high-temperature creep resistance and ductility in oxide ceramics can be designed from the viewpoint of chemical bonding state such as ionic and covalent bonding in the grain boundary. This type of approach is no doubt one of the most effective ways to break through the present situation in fabrication of advanced materials.

本计画旨在研究氧化铝、氧化锆等细晶粒氧化物陶瓷材料的高温塑性流动中晶界的电子结构。本项目还旨在揭示陶瓷晶界附近的电子结构对高温力学性能的作用，并开发一种新的理论方法来制造高温用陶瓷。在1999 ~ 2001年的研究期间，我们成功地揭示了晶界电子结构对陶瓷高温力学性能的作用，建立了以“晶界电子结构”控制陶瓷高温变形机制的新概念。我们的研究结果的一个关键主题是，高温蠕变阻力和韧性的氧化物陶瓷可以设计的观点，从化学键的状态，如离子和共价键在晶界。这种方法无疑是突破先进材料制造现状的最有效方法之一。

项目成果

Z.L.Hong, H.Yoshida, Y.Ikuhara, T.Sakuma, T.Nishimura, M.Mitomo, J.Europ: "The effect of additive on the densification process and high temperature strength retention in silicon nitride with Re-disilicate"Ceram. Soc.. 22. 527-534 (2002)

Z.L.Hong、H.Yoshida、Y.Ikuhara、T.Sakuma、T.Nishimura、M.Mitomo、J.Europ：“添加剂对重二硅酸盐氮化硅致密化过程和高温强度保持的影响”陶瓷

H.Yoshida, Y.Ikuhara, T.Sakuma: "High-temperature creep resistance in lantanoid ion -doped polycrystalline Al_2O_3"Philos. Mag. Lett.. 79. 249-256 (1999)

H.Yoshida、Y.Ikuhara、T.Sakuma：“镧系离子掺杂多晶 Al_2O_3 的高温抗蠕变性”Philos。

Committee No. 133: "Microstructure and performance in materials"Microstructure and performance in materials, JSPS. (2001)

第133号委员会：“材料中的微观结构和性能”材料中的微观结构和性能，JSPS。

H.Yoshida, T.Yamamoto, Y.lkuhara, T.Sakuma: "A change in the chemical bonding strength and high-temperature creep resistance in Al_2O_3 with lanthanoid oxide doping"Philos. Mag.. (印刷中). (2002)

H.Yoshida、T.Yamamoto、Y.lkuhara、T.Sakuma：“镧系氧化物掺杂的 Al_2O_3 中化学键合强度和高温抗蠕变性的变化”Philos Mag.（出版中）。

T.Watanabe,H.Yoshida,T.Yamamoto,Y.Ikuhara and T.Sakuma: "Atomic structures and properties of symmetric[0001]tilt grain boundaries in alumina"Ceram.Trans.,. (in press).

T.Watanabe、H.Yoshida、T.Yamamoto、Y.Ikuhara 和 T.Sakuma：“氧化铝中对称[0001]倾斜晶界的原子结构和性质”Ceram.Trans.，。