权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Ceramic/Metal Mutual Nanocomposites with Superior Strength and Toughness

具有优异强度和韧性的陶瓷/金属互纳米复合材料的开发

基本信息

批准号：
06555195
负责人：
NIIHARA Koichi
金额：
$ 8.77万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

Nanocomposites technology is well known to improve 2 to 4 times the fracture strength of ceramic materials even at high temperatures. The high-temperature creep rate is also improved 3 to 4 orders by this technology. The purpose of this project are to clarify the mechanisms of mechanical property improvements and to develop various kinds of multi-functional ceramic materials (Intermaterials) by applying this nanocomposite technology. The final target of this project is to propose the nano/cluster composite concept with better mechanical properties, based on the nanocomposite technology.The main results obtained from this project is as follows : 1) In the ceramic/eramic and ceramic/metal nanocomposites, new processing to homogeneously disperse the nano-sized second phases were developed, and the mechanisms of mechanical property improvements by the nano-sized second phase dispersions were clarified. 2) Based on the above-mentioned informations, new ceramic materials, in which the fracture strength and toughness were simultaneously improved, were developed by the micro/nano hybrid concept in the ceramic/ceramic composite systems, and by the mutual nanocomposite concept in the ceramic/metal composite systems especially Zirconia/Mo nanocomposite system. 3) Furthermore, new material design to improve the mechanical properties of ceramic materials by the soft and week second phase dispersions was proposed. By applying this concept, significantly improved strength, toughness, thermal shock fracture resistance and chemical inertness were harmonized with the machinability like metals in the Si3N4/BN nanocomposite. In the BaTi03/Ni nanocomposite system, the high strength with the improved ferroelectricity was obtained. For example, the fracture strength was improved 2 to 3 times by dispersing the nano-sized Ni particulates, and the same level improvement was also observed for the dielectric constant.

众所周知，即使在高温下，纳米复合材料技术也能将陶瓷材料的断裂强度提高 2 至 4 倍。通过该技术，高温蠕变速率也提高了3至4个数量级。该项目的目的是阐明机械性能改善的机制，并通过应用这种纳米复合技术开发各种多功能陶瓷材料（Intermaterials）。该项目的最终目标是基于纳米复合材料技术，提出具有更好机械性能的纳米/团簇复合材料概念。该项目取得的主要成果如下：1）在陶瓷/陶瓷和陶瓷/金属纳米复合材料中，开发了均匀分散纳米第二相的新工艺，并研究了纳米第二相改善机械性能的机理。分散体得到澄清。 2）基于上述信息，通过陶瓷/陶瓷复合体系中的微/纳米杂化概念，以及陶瓷/金属复合体系特别是氧化锆/钼纳米复合体系中的互纳米复合概念，开发了断裂强度和韧性同时提高的新型陶瓷材料。 3）此外，提出了通过软且弱的第二相分散体来提高陶瓷材料机械性能的新材料设计。通过应用这一概念，Si3N4/BN 纳米复合材料显着提高了强度、韧性、抗热冲击断裂性和化学惰性，并与金属一样的可加工性相协调。在BaTi03/Ni纳米复合材料体系中，获得了高强度和改善的铁电性。例如，通过分散纳米尺寸的Ni颗粒，断裂强度提高了2至3倍，并且介电常数也观察到相同水平的提高。