Nanocomposite particles of Al2O3-doped ZnO prepared by mechanical treatment were used for fabricating ZnO ceramics. TEM observations revealed that Al2O3 nanoparticles uniformly existed on a ZnO particle. The sintering body fabricated using the composite powder prepared by this mechanical treatment process had more uniform and finer microstructures than that fabricated using the powder mixture prepared by conventional wet mixing. The ZnO ceramics prepared by the mechanical treatment exhibited higher electrical conductivity than those prepared by the conventional wet ball milling process.

Terahertz wave resonators composed of three-dimensional photonic crystals composed of alumina lattices with diamond structures were designed and fabricated by using microstereolithography process. These three dimensional periodic structures of ceramics can reflect perfectly the terahertz waves through Bragg diffraction. A micro glass cell including water solvents was put between two photonic crystals to realize multiple resonations of terahertz waves to synchronize with various vibration modes of saccharide or protein molecules and control biochemical reactions through electromagnetic excitations.

Titania micropatterns with periodic arrangements were successfully formed on glass substrates for use with electromagnetic wave energy resonance and localizations in terahertz frequency ranges. Geometric arrangements of acrylic polygonal tablets with titania particle dispersions were fabricated by using micropatterning stereolithography. Moreover, periodically arranged full anatase-phase titania tablets were created homogeneously through liquid-phase crystal depositions of water solvent processes, using microtemplates fabricated by using the stereolithography system. The terahertz wave properties were measured and calculated by using a time-domain spectroscopic system and finite-difference time-domain method.

No abstract

Abstract. Thermal nanoparticles coating and microlines patterning were newly developed as novel technologies to fabricate fine ceramics layers and geometrical intermetallics patterns for mechanical properties modulations of practical alloys substrates. Nanometer sized alumina particles were dispersed into acrylic liquid resins, and the obtained slurries were sputtered by using compressed air jet. The slurry mists could blow into the arc plasma with argon gas spraying. On stainless steels substrates, the fine surface layers with high wear resistance were formed. In cross sectional microstructures of the coated layers, micromater sized cracks or pores were not observed. Subsequently, pure aluminum particles were dispersed into photo solidified acrylic resins, and the slurry was spread on the stainless steel substrates by using a mechanical knife blade. On the substrates, microline patterns with self similar fractal structures were drawn and fixed by using scanning of an ultra violet laser beam. The patterned pure metal particles were heated by the argon arc plasma spray assisting, and the intermetallics or alloys phases with high hardness were created through reaction diffusions. Microstructures in the coated layers and the patterned lines were observed by using a scanning electron microscopy. IntroductionThermal nanoparticles spraying had newly developed as a novel coating technique to create fine ceramic layers without structural defects on practical alloys substrates [1,2]. The nanometer sized alumina ceramic particles were dispersed into liquid resins. Fluid viscosity of the mixt pastes were measured and optimized to realize homogenized particles dispersions and smooth slurry flows. The obtained thixotropic slurry of rheological flow was sputtered by using compressed air jet, and the slurry mist blew into the arc plasma with an argon gas spraying. On a stainless steel substrate, the ceramic layers were formed. The formation of micro cracks and pores in the coated layers will be discussed by scanning electron microscope observations. Subsequently, thermal microline patterning to realize metal phases drawing on the alloys substrates had been developed [3,4]. Micrometer sized pure aluminum particles were dispersed into the photo solidified liquid resins. The slurry pastes were spread on the stainless steel substrate, and micro patterns were drawn and fixed by using an ultra violet laser scanning. The patterned pure metal particles were heated by the argon arc plasma spraying, and the intermetallics and alloys phases with high hardness were created through reaction diffusions. Microstructures and composite distributions in the vicinity of formed alloy and metal interfaces were observed and analyzed by using an electron microscope. Load dispersion abilities of the network were evaluated by using conventional mechanical tests and compared with simulated and visualized profiles by using a numerical analysis simulation. The modulation effects of stress distributions on the material surfaces by design and fabrication o...