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.

研究了四元ZrO_2基氧化物在低温下发生高应变速率超塑性的材料条件。即使在未掺杂的高纯Y-TZP中，也发现对于晶粒尺寸和烧结密度的一定组合也会发生HSRS。对于这种组合，积极的影响是有限的其他阳离子的少量添加和一些立方相的分散。为了在较低温度下获得HSRS，除了接近过饱和的阳离子掺杂或非化学计量立方相的分散之外，还需要小于0.2 μm的细晶粒尺寸。结果还表明，在材料加工和超塑性变形，分别是重要的孔湮灭和生长机制的转变。

项目成果

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

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

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

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

Grain Boundary Nanostruc- ture Control for the Improvement of High Temperature Ductility in Oxide Ceramics

晶界纳米结构控制提高氧化物陶瓷的高温延展性

• 发表时间: 2012
• 作者: 北嶋将太;樋口透;小林清;目義雄;眞岩宏司;H. Yoshida
• 通讯作者: H. Yoshida