Development of low-temperature high-strain-ratesuperplastic ceramics through controlling grain-boundary segregation and nonstoichiometry in oxide ceramics

通过控制氧化物陶瓷中的晶界偏析和非化学计量开发低温高应变率超塑性陶瓷

• 批准号: 21360328
• 负责人: HIRAGA Keijiro
• 金额: $ 11.4万
• 依托单位: Kitami Institute of Technology (2012)National Institute for Materials Science (2009-2011)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21360328/
• 关键词: 構造用セラミックス; 高速超塑性; 微細粒緻密化; 不定比化合物; 固溶体; 微結晶粒酸化物; 粒界偏析; 不定比性; 局所応力緩和

In tetragonal ZrO_2.base oxides, material conditions were investigated for the occurrence of high-strain-rate superplasticity (HSRS) at lower temperatures. Even in undoped high-purity Y-TZP, HSRS was found to occur for a certain combination of the grain size and sintered density. For this combination, positive effects were limited for minor additions of other cations and for the dispersion of some cubic phases. For attaining HSRS at lower temperatures, fine grain sizes smaller than 0.2 μm is necessary in addition to nearly supersaturating cation doping or the dispersion of nonstoichiometric cubic phases. The results also indicated that a transition in the mechanisms of pore annihilation and growth is important for material processing and superplastic deformation, respectively.

在四方ZRO_2.种氧化物中，研究了材料国际，以实现高压率超塑形（HSR）的出现。烧结的密度。对于这种组合，对于其他阳离子的较小添加而有限制的阳性效果以及某些立方在较低温度下达到HSR的处置，除了neal supersaturaturatigtigtiong poping或分散式射量阶段外，还需要比0.2μm的细晶粒尺寸。孔洞的机制对于材料处理和超代变形很重要。

项目成果

Superplastic flow in tetrag-onal Zr_O2 polycrystal doped with TiO_2and/or GeO_2: grain boundary chemistryrelated matter transport

TiO_2和/或GeO_2掺杂四方Zr_O2多晶中的超塑性流动：与晶界化学相关的物质输运

• 发表时间: 2009
• 作者: 小田浩明;山崎倫昭;河村能人;大津雅亮;高島和希;東田賢二;Lydia Anggraini and Kei Ameyama;H. Yoshida
• 通讯作者: H. Yoshida

構造セラミックスの粒界と高温機械特性

结构陶瓷的晶界与高温力学性能

• 发表时间: 2010
• 作者: 國光佑美;岸肇;今出陣;大下晋弥;森下義弘;浅田光則;吉田英弘
• 通讯作者: 吉田英弘

High-Strain-Rate Super-plasticity and failure in undoped tetrag-onal zirconia polycrystals (Y-TZP)

无掺杂四方氧化锆多晶 (Y-TZP) 的高应变率超塑性和失效

• 发表时间: 2010
• 作者: K.Kakimoto;et al.;K. Hiraga
• 通讯作者: K. Hiraga

Superplastic deformation of transparent hydroxyapatite

• DOI: 10.1016/j.scriptamat.2013.02.044
• 发表时间: 2013-07
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: H. Yoshida;Byung‐Nam Kim;Hyoung-Won Son;Young-Hwan Han;Sukyoung Kim

Low-Temperature Spark Plasma Sintering of Yttria Ceramics with Ultrafine Grain Size

• DOI: 10.1111/j.1551-2916.2011.04583.x
• 发表时间: 2011-10
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: H. Yoshida;K. Morita;Byung‐Nam Kim;K. Hiraga;K. Yamanaka;K. Soga;Takahisa Yamamoto