Design, Fabrication and Evaluation of Materials Anisotropy
Toshihiko TANI, Ph.D.
Fellow & Program Manager in Frontier Research Center, Toyota CRDL, Nagakute, Japan Professor, Toyota Technological Institute, Nagoya, Japan
Technologies to create/exploit/enhance anisotropic properties of materials have recently attracted attentions from the engineering demands for devices and structures with high and/or unique performances. One finds in nature, many anisotropic-structured materials such as lumbers and seashells as a result of oriented biological growth. From past to present, carpenters and craftsmen have known well anisotropic properties of the bio-materials and fabricated, for example, a 1300 year long-lasting wooden tower and gorgeous jewelry boxes with mother-of-pearl-inlay. We have been interested in the design of unique and useful artificial micro/meso/nanostructures such as oriented polycrystals and nano-composites. Control of growth or scaling direction is the key in the processing design for the anisotropic materials. Quantitative characterization and simulation techniques for materials anisotropy are also important for the evaluation of processing and prediction of properties. In this talk, several examples of materials we designed and fabricated in TCRDL are presented with their background science and technologies. The topics include:
(1) Highly textured bulk ceramics for lead-free piezoelectrics and oxide thermoelectrics.
(2) Polymer-aligned clay molecule nano-composites with high gas-impermeability.
(3) Growth orientation switching for high quality bulk SiC single crystals.
(4) Internal nanostructures of obliquely deposited thin films for antidazzle mirrors.
(5) Anisotropic etching of Si single crystals for high-power devices.
(6) Mono-dispersed spherical meso-porous silica for tunable adsorption characteristics.
Toyota Technological Institute is also introduced as a unique engineering college with a cooperative graduate school with Toyota CRDL.
February 28, 2013, 14:40-16:30, FENS 2019