（机电学院，2014年秋季第13周）
 

【主  题】：Preceramic Paper-Derived Ceramics 新型衍生陶瓷——陶瓷先驱体纸

【主讲人】：Nahum Travitzky教授，德国埃尔兰根-纽伦堡大学

【时  间】：2014年12月16日（星期二）下午14：10-16：00

【地  点】：机电学院大会议室（机械工程楼Z802B）

【主  办】：研究生工作部

【承  办】：机电学院

 

Professor Nahum Travitzky is Leader of Advanced Ceramic Processing and Additive Manufacturing Group at the University of Erlangen-Nuremberg, Department of Materials Science, Glass and Ceramics, Germany Since 2002. His current research activities pertain to design, advanced processing and characterization of ceramic-based materials with the focus on ceramic–metal composites, preceramic paper and polymer-derived ceramics. He is author and co-author of more than 130 scientific publications in the international journals and 24 patents. He presented more than 40 invited and keynote lectures.

Travitzky is reviewer for more than 20 International Journals. He is also reviewer for various national and international research foundations. He participated in various national (eg. Rapid Prototyping, DKG, Germany) and international (eg. EUROMAT, Europe; MS&T, USA; ICACC, USA) conferences organizing committees. He was and is guest editor for Ceramic Forum International, Advanced Engineering Materials, Journal of Ceramic Science and Technology etc.

Nahum Travitzky教授自2002年起担任德国埃尔兰根-纽伦堡大学材料科学与工程学院先进陶瓷加工和添加剂制造课题组组长。目前主要研究领域为：陶瓷基金属复合材料、陶瓷先驱体纸和聚合物—衍生陶瓷的设计、先进加工和特性研究等。在国际期刊上已发表论文130多篇，获得专利24项，在国际会议上做邀请报告或主题报告40多次。

Travitzky教授目前担任20多个国际期刊的论文评审人，德国自然科学基金和国际研究基金会的评审人，多个国际学术会议组委会委员。担任国际陶瓷论坛、先进工程材料和陶瓷科学与技术学报等期刊的特邀编辑。

Novel class of preceramic paper may serve as a preform to manufacture lightweight as well as multilayer ceramic products. Based on well established paper processing techniques fabrication of cellular components of variable geometry, size, and complexity can be achieved. In this talk, the formation, microstructure and properties of preceramic papers and their conversion into ceramic materials will be discussed. Oxide as well non-oxide ceramics were processed into single sheet, corrugated structures and multilayer ceramics. A high filler loading and uniform distribution of ceramic fillers involves control of colloidal surface inter-action including electrostatic, electrosteric and mechanical retention mechanisms. Sintering of oxide loaded preceramic paper in air results in highly porous products with the porosity shape and distribution templated by the pulp fiber used in paper making. In the case of carbide loaded paper, dense composite materials are obtained by reactive infiltration processing. Anisotropic properties of machine fabricated preceramic paper and bonding interfaces in multilayer stacks give rise to anisotropic mechanical properties of resulting ceramic composites. Non-catastrophic failure was observed when tensile loading stress was applied parallel to the interfaces (in-plane loading). Due to the flexibility in shaping, stacking and the ability to apply computer aided manufacturing (eg. laminated object manufacturing) and the versability of chemical compositions, the preceramic paper offers an economical approach to process lightweight ceramics with tailored macro- and microscopic porosities for a broad field of applications.

新型的陶瓷先驱体纸可以用于制造轻质的和多层陶瓷产品的预制件。基于精湛的造纸技术可以制备几何形状和尺寸可变的、复杂的细胞组件。主要讲述陶瓷先驱体纸和转换成陶瓷材料后的成型、微观结构和性能的关系。氧化物和非氧化物陶瓷加工成单片状、波纹状结构和多层陶瓷。高填充量和陶瓷填料的均匀分布涉及到了胶体表面的相互作用，其中包括了静电、静电位和力学保留机制。通过在造纸中使用纸浆纤维，在空气环境中，氧化物加载陶瓷先驱体纸烧结可获得高气孔率并且具有理想孔隙形状和分布的产品。在碳化物加载纸的情况下，通过反应浸渗处理可得到致密复合材料。机制先驱体纸的各向异性和粘结界面的多层堆叠增强了陶瓷复合材料的各向异性力学性能。当拉伸加载压力施加于平行界面（在面上加载）时能观察到非灾难性失效。由于在成型和堆叠方面的灵活性、电脑辅助制造的能力（例如分层实体制造）和化学成分的多功能运用，这些都给陶瓷先驱体纸提供了一个经济有效的方法去加工具有特定宏观-微观孔径的多孔轻质陶瓷，这类陶瓷有着广泛的应用。