Materials Literature
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The tetrahedral amorphous carbon (ta-C) DLC coating showed superlow friction behavior under the boundary lubrication with an organic friction modifier such as glycerol mono-oleate (GMO). On the other hand, there are many reports about the tribological properties of DLC coatings under lubrication with zinc dialkyldithi…
For wide application of magnesium(Mg), it is necessary to quantitatively evaluate the activation condition of each deformation mode observed in deformation experiments of Mg. In usual experiments, critical resolved shear stress(CRSS) is used for quantitative evaluation of deformation. However, recent work on deformati…
In order to investigate the mechanical factors dominating crack propagation induced by nano-meter-scale singular stress field, crack propagation experiments are carried out using silicon (Si) single crystal specimens, which possess precracks with nano-meter-scale singular stress field. The minimum size of singular str…
Joint microstructures and fatigue behavior of ferritic stainless steel type 430 welds with different weld metals were investigated. Two weld metals with different chemical compositions, NbL1 and NbL2, had been used for the MIG butt welding of type 430. NbL2 with Al and Ti showed fmer grains in the weld microstructure…
The influence of loading direction on cyclic deformation behavior of rolled AZ31 magnesium alloy (average grain size: approximately 40μm) was investigated. Cyclic tensile and compressive loading-unloading tests were carried out using cylindrical smooth specimens. Pseudoelastic behaviors were observed in tensile and co…
We propose a distorted optical waveguide around a microsphere to mimic curved spacetimes caused by the “gravitational fields”. Gravitational lensing effects analogues are experimentally demonstrated and this can be used to prospective light harvesting.
This study focuses on the self-crack-healing process of Al_2O_3/30 vol.% SiC composites. Specimens with cracks were subjected to thermal treatment at 1000℃ and 1200℃, their strengths were measured by a three-point bending test, and nano/micro structural analysis of crack-healed zone was performed using scanning electr…
A flame combustion method enables the synthesis of diamond using acetylene-oxygen in ambient atmosphere. It has various advantages over other methods. In this method, during cooling, most diamond films delaminate as a result of thermal stress. We previously synthesized diamond films on a Mo substrate surface by the fl…
Thermoelectric generation units have been produced using cascade modules of oxide and Bi_2Te_3 devices. Power density of the cascade module is as high as 7.8 kW/m^2 at 1000℃of the heat source temperature and higher than that of Bi_2Te_3 and oxide single modules at temperatures higher than 800℃. A thermoelectric unit c…
In order to clarify the mechanism of core meltdown which occurred in the Fukushima Dai-ichi nuclear power plant, the details of the melting behavior of fuel elements, such as fuel rods and control rods, must be clarified. However, it is not easy to obtain these data experimentally. Then, to clarify the melting behavio…
Macro- and micro-structure and hardness of hardened layer of induction hardened SUJ2 and SCM435 steel gears were measured, and profiles of hardened layers and effective hardened depths were obtained. Bending fatigue tests of induction hardened SUJ2 and SCM435 steel gears were carried out and S-N curves and bending fat…
Identify of vibration damping mechanisms of
Effect of surface profile processed by micro slurry -jet erosion
Effect of aging on activity of twinning in magnesium alloy AZ91 was investigated. The experimental results showed that stress-strain curves during reversed loadings were different between tension after compression and compression after compression. The difference in stress-strain behavior decreased with the increase i…
Shape Memory Gel (SMG) is one of the most interesting unique soft and wet materials. Its shape memory function is due to the crystalline feature of alkyl side chain integrated into main polymer chain. The side chain switches its state between amorphous phase and crystalline phase depending on temperature. The elastic…
Cerium phosphate was synthesized by co-precipitation method ÂÂ the base salt. This base salt was doped with zinc having different molarities. Their structure and morphologywere characterized byX- ray diffraction (XRD), Fourier transform infra red spectroscopy (FTIR), scanning electron microscopy (SEM) and transmissio…
The wear performance between Partially Stabilized Zirconia (PSZ) plate and silicon nitride ball under dry conditions was investigated. The wear durability of PSZ with shot peening was higher than that of PSZ without shot peening in the sliding wear test under low Hertzian contact pressure. Due to shot peening, the tra…
Metal nanoparticles decorated carbon nanotubes (CNTs) have been thoroughly investigated as electrode of fuel cells and chemical and biological sensors. In these applications, the size and the density of nanoparticles are very important, because the catalyst activation depends on the particle size and the density. Rece…
以固态氧化物为原料,采用固态合成工艺制备Pb（Zn1/3 Nb2/3）O3-Pb（Ni1/3 Nb2/3）O3-Pb （ZrTi）O3（PZN-PNN-PZT）压电陶瓷,并研究了锆钛比（r（Zr） /r（Ti））、Ba2＋的A位取代及Ba2＋、La3＋的A位复合取代对压电陶瓷电性能的影响.结果表明,PZN-PNN-PZT压电陶瓷在r（Zr）/r（Ti）=1.03下,进行Ba2＋,La3＋的A位复合取代后,即式子在Pb0.92Ba0.04La0.04 （Ni1/3 Nb2/3）y（Zn1/3Nb2/3）zZrm TinO3时压电性能最佳,其介电常数eT33/e0=5 657,压电常数d33=709 pC/N,机电耦合系数kp=0.6…
We have developed a novel magnetic micropillar substrate made of poly(dimethylsiloxane) to apply the mechanical stimulation to individual cell adhesion sites of cells, and to measure associated internal tension of cells. We have successfully embedded enough amount of iron particles into the micropillars and controlled…