Addition of New Functions to Ziroconia Ceramics by Nano-sized Metal Dispersion

纳米金属分散体为氧化锆陶瓷增添新功能

• 批准号: 11650718
• 负责人: SEKINO Tohru
• 金额: $ 2.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650718/
• 关键词: nanocomposites; multi-functionality; zirconia; internal reduction technique; nanocomposite powder; mechanical properties; ferromagnetic property; stress-magnetic interaction; 遷移金属分散; 還元燒結法; in-situ組織制御; ナノ複合材料; 繊維金属分散; 還元焼結法

In this project, I have focused on the development of multi-functional zirconia-based nanocomposite materials. For over the decades I have concentrated to design and to develop ceramic/metal nanocomposite, in which nanometer-sized metal dispersed within Al_2O_3, MgO and so on. Based on this concept I have applied this technique to zirconia-based nanocomposite. Zirconia is well known to show high-strength and toughness due to its stress-induced phase transformation toughening. To enlarge the application of this ceramic, addition of new functions or realizing multifunctionality may be necessary. Therefore, I have investigated to develop transition metal dispersed zirconia nanocomposite in order to achieve above-mentioned purposes. Here, I selected Ni as dispersed functional metal nanoparticles. Several kinds of fabrication processing have been applied.In this research, followed results have been obtained.(1) Proposed ZrO_2/Ni nanocomposites have been successively prepared by using reduct … More ion and sintering method for various ZrO_2/NiO composite powders. Large enhancement of fracture strength of zirconia was achieved when small amounts of Ni nanoparticles were dispersed into zirconia. Ferromagnetism of nanosized-Ni was also compatible in this nanocomposite. Magnetic coercivity was dominantly increased with decreasing particle size of Ni. In addition, magnetization was found to be sensitive to applied stress, showing the possibility of non-destructive remote sensing of deformation/fracture of nanocomposites.(2) When very small amount of NiO dopant was added into zirconia, dens solid solution with tetragonal structure was prepared, which had improved toughness. This is due to the control of stability of crystal structure of zirconia by small amount of NiO dopant. This fact indicates that phase transformation behavior can be controlled. In addition, zirconia/Ni nanocomposites could also be obtained by atmosphere-controlled heat-treatment of this solid solution ; Nanosized Ni particles were successively in-situ precipitated. This nanocomposite was found to show both high-toughness and ferromagnetism, implying the advantage of this newly developed "internal reduction method" for making ceramic/metal nanocomposites.(3) Powder preparation for zirconia/nickel nanocomposite was also investigated by using solution chemical route. Appropriate control factors for this chemical processing have been clarified. This method allowed us to obtain nanocomposite powder of ZiO_2-NiO with nanometer-size, which is more useful for developing ZiO_2/Ni nanocomposite and related materials.In conclusion this research project has successively conducted to develop novel multifunctional zirconia/nickel nanocomposites. This material exhibited both excellent mechanical properties and magnetic functionalities. All these new preparation techniques are considered to be applicable to another ceramic nanocomposite systems. Less

在这个项目中，我专注于基于多功能氧化锆的纳米复合材料的开发。在过去的几十年中，我一直专注于设计和开发陶瓷/金属纳米复合材料，其中纳米尺寸的金属分散在Al_2O_3，MGO等中。基于这个概念，我将此技术应用于基于氧化锆的纳米复合材料。锆众众所周知，由于其应力诱导的相变韧性，可以显示出高强度和韧性。为了增加这种陶瓷的应用，可能需要增加新功能或实现多功能性。因此，我已经研究了开发过渡金属分散的氧化锆纳米复合材料，以实现上述目的。在这里，我选择了Ni作为分散的功能性金属纳米颗粒。已经采用了几种制造过程。在这项研究中，已经获得了遵循的结果。（1）提出的Zro_2/ni纳米复合材料已通过还原成功制备了……用于各种Zro_2/Nio复合粉末的更多离子和烧结方法。当将少量的Ni纳米颗粒分散到氧化锆时，实现了氧化锆骨折强度的大量增强。纳米化-Ni的铁磁磁性在该纳米复合材料中也兼容。随着Ni的粒径降低，磁性可矫正量主要增加。此外，发现磁化对施加的应力很敏感，表明纳米复合材料的变形/断裂的非破坏性远程敏感性。（2）当将非常少量的Nio掺杂剂添加到氧化锆中时，制备了带有四方结构的浓密溶液，从而提高了韧性。这是由于少量的Nio掺杂剂控制了氧化锆晶体结构的稳定性。这个事实表明可以控制相变行为。此外，还可以通过对这种固体溶液的大气控制热处理获得氧化锆/Ni纳米复合材料。纳米化的Ni颗粒被成功地沉淀。发现该纳米复合材料既显示出高水平和铁磁剂，这意味着这种新开发的“内部还原方法”用于制造陶瓷/金属纳米复合材料。（3）还使用溶液化学途径研究了氧化二氧化碳/镍纳米复合材料的粉末制备。已经阐明了该化学加工的适当控制因子。这种方法使我们能够用纳米尺寸获得ZIO_2-NIO的纳米复合粉末，这对于开发ZIO_2/NI纳米复合材料和相关材料更有用。在结论中，该研究项目成功地开发了新型的多功能氧化锆/镍/镍纳米复合材料。该材料既具有出色的机械性能和磁功能。所有这些新的制备技术都被认为适用于另一种陶瓷纳米复合系统。较少的

项目成果

H.Kondo,T.Sekino,Y.-H.Choa,T.Kusunose,T.Nakayaama and K.Niihara: "Influence of Ni addition on mechanical and magnetic properties of yttria-stabilized tetragonal zirconia"Journal of Ceramic Processing Research. 1・1. 80-82 (2000)

H.Kondo、T.Sekino、Y.-H.Choa、T.Kusunose、T.Nakayaama 和 K.Niihara：“Ni 添加对氧化钇稳定的四方氧化锆的机械和磁性能的影响”陶瓷加工研究杂志。 1・1.80-82 (2000)

H.Kondo,T.Sekino,Y.-H.Choa and K.Niihara: "Effect of Nickel Addition on Microstructure and Some Properties For Tetragonal Zirconia"Ceramic Transactions. 108. 28-294 (2000)

H.Kondo、T.Sekino、Y.-H.Choa 和 K.Niihara：“镍添加对四方氧化锆微观结构和某些性能的影响”陶瓷交易。

Sekino,Yu,Choa,Lee,Niihara: "Reduction and Sintering of Alumina/Nickel Nanocomposites: Powder processing, Reduction Behavior and Microstructural Characterization"J. Ceram. Soc. Japan. 108・6(印刷中). (2000)

Sekino、Yu、Choa、Lee、Niihara：“氧化铝/镍纳米复合材料的还原和烧结：粉末加工、还原行为和微观结构表征”J. Ceram 108・6（出版中）。

T.Sekino,T.Kusunose,Y.-H.Choa and K.Niihara: "Al_2O_3/Ti Nanocomposites Prepared by In-Situ Decomposition and Sintering"Proc.of 4th Seminar on Core University Program between Japan and Korea. 149-152 (2001)

T.Sekino,T.Kusunose,Y.-H.Choa和K.Niihara:“原位分解和烧结制备Al_2O_3/Ti纳米复合材料”第四届日韩核心大学项目研讨会论文集。

T.Nakayama, Y.H.Choa, T.Sekino and K.Niihara: "Powder Preparation and Microstructure for Nano-sized Metallic Iron Dispersed MgO Based Nanocomposites with Ferromagnetic Response"J.Ceram.Soc.Japan. 108[9]. 781-784 (2000)

T.Nakayama、Y.H.Choa、T.Sekino 和 K.Niihara：“具有铁磁响应的纳米金属铁分散 MgO 基纳米复合材料的粉末制备和微观结构”J.Ceram.Soc.Japan。