Advanced Materials Research Vols. 314-316

Abstract: Volumetric 3D display system (alternatively known as true 3D display system) has recently seen great progress. Powerful and functional software that can interfaces with 3D display hardware system was eagerly expected. In this paper we propose a method of generating geometry slices that can be presented on Multi-planar 3D display which will be fused in the human visual system into a 3D volume. Our main novel contribution is to use the programming language of Maya – MEL (Maya Embedded Language) to obtain geometry slices or image slices that meet the projection requirements-- including spinning screen based projection and to and fro translating screen based projection. We show that set of cross-section slices with different thickness, interval angle or distance can be split from a built mechanical component. Moreover the experiments of assembling series of geometry slices together to form a 3D spatial object can be employed to simulate the performance of Multi-planar 3D display. The latest imaging method opens up many application areas when incorporating with a Volumetric 3D display which will enhance visualization of the complex structure , better appreciate the entire 3D data and improve product design, function visualization, manufacturing preview and maintenance training.

Abstract: A higher hardness carburized layer was formed on the surface of purity titanium by a double glow plasma hydrogen-free carburizing technique depending on glow discharge and hollow cathode effect. High purity solid graphite was used as a source cathode and purity titanium was used as the cathode materials. Experimental results indicate that higher hardness TiC phase and dissociate state carbon antifrictionphase were formed in the carburized layer. The carbon concentration and the hardness of carburized layer distribute in the gradient along the carburized layer from the surface to the inner. The surface hardness increases more than two times. Friction coefficient of Ti materials treated by hydrogen-free carburizing reduces by about 1/2.

Abstract: Fluorescent chromophores are generally known to have planar and rigid -conjugation systems, and we have been interested in the chemistry of nitrogen-containing heterocyclic molecules for many years. Quinoxaline was the representative fluorophore, and several quinoxaline derivative compounds were reported over the recent years. Quinoxaline can easily change their absorption or emission wavelength by oxidation among proton and nitrogen of the quinoxaline ring. In addition, it has been proved that many types of metal chelating ligand substituents such as dipyrrole, terpyridine, and crown-ether rings can control electronic levels of those fluorephores. In this study, we designed and synthesized several 2,3-distyrylquinoxaline derivatives with each have a substituent of alkyl groups which have different electron-donating abilities and aza-crown ether, a chelating agent with metal-cation. The chromophoric system of these compounds, and the substituent effects on their absorption spectra in a solution, were studied. And we approached the application to nanofibers by electrospinning which contained the synthesized colorants mentioned above

Abstract: Two 5Mn-1.5Al TRIP steels with and without Nb microaddition were developed in the present study. The steels contain bainite, martensite, interlath retained austenite and martensite- austenite islands. The paper presents the results of the compression tests carried out at various temperatures using the Gleeble simulator. To analyze the kinetics of static recrystallization in these steels, a softening kinetics were determined in a double-hit compression test. It was found that the dynamic recovery is a main thermally activated process occurring during hot deformation. The Nb microalloyed steel has higher flow stresses and peak strains than the Nb-free steel. A solute drag effect of Nb results in a slower softening kinetics of Nb containing steel. The effects of Mn on the retardation of Nb(C,N) precipitation and hot deformation characteristics are also discussed.

Abstract: Simulation on transmittance for different submicron-structures by finite difference time domain method is studied. The objectives of this study are to discuss transmittance for different submicron-structures. Different structures have different effects of transmittance and reflectance; therefore different sizes, shapes, periods and aspect ratios of submicron-structures are discussed in the current study. High transmittance at the visible waveband and heat insulation at the infrared range are expected for application of car window. The simulation results for flat surface and pyramid structures show that the transmittance increases from 95.7 % to 99.8 % at the wavelength of 760 nm and slightly from 96.0 % to 96.3 % at the infrared range. Though the effect of heat insulation slightly decreases while the infrared passes through the submicron-structures, the high visibility helps for car driving safety. The pyramid structure shows the optimal condition for the application of car window at the aspect ratio of 1 to 2 than other shapes.

Abstract: In this paper, an applied classic control theory is adopted for the dynamics analysis for the electro-hydraulic servo drive device in which lower-powered integrative base on Matlab. The concrete measures are carried out to improve the dynamics of the system.

Abstract: Chemical mechanical polishing (CMP) has been a widely applied process for hard disk substrates with nickel–phosphorous (Ni–P) plated. In this paper, the effects of abrasive and surfactant on the polishing performance of hard disk substrates using prepared colloidal silica-based alkaline slurry were investigated. The experimental results indicate that the material removal rate (MRR) strongly depends on the abrasive concentration and nonionic surfactant have little influence on the material removal rate. Under the testing conditions, smaller SiO₂, moderate SiO₂ concentration and higher surfactant concentration can obtain high surface quality in the prepared slurry. These results have been explained by which the abrasive particles move through the cover layer caused by surfactant adsorption on the disk substrates surface being polished.

Abstract: In order to reduce friction coefficient of the Ni-base alloy coating and further improve its wear resistance, the graphite/TiC/Ni-base alloy composite coating was prepared on the surface of 45 carbon steel by plasma spray. Effects of loads, friction counterparts and lubricants on tribological properties of the coating were investigated. The results show that friction coefficient of the composite coating is reduced by 33% than that of the Ni-base alloy coating when worn against GCr15. Wear losses of the composite coating are less than those of the Ni-base alloy coating at all loads of 6N, 8N, 10N and 12N. Worn against Si3N4, friction coefficient of the composite coating is 13% less than that worn against GCr15, but its wear loss is 2.9 times of that worn against GCr15. Wear mechanism of the composite coating is micro cutting and brittle fraction when worn against Si3N4. Under lubrication of NaCl solution, friction coefficient of the composite coating is almost the same as that under dry sliding, wear loss is increased by 1.6 times. Stress corrosion and wedging effects of the NaCl solution are main wear mechanisms of the composite coating.

Abstract: AISI 1045 steels were laser-clad with Ni-based powder by CO2 HJ-4 coherent laser. The phase composition of the laser-cladding coating was investigated by means of X-ray diffraction (XRD). The cross-section of the cladding coating was observed using a scanning electron microscopy (SEM). The friction and wear properties of the laser cladding coatings sliding against AISI 52100 steel under the lubrication of liquid paraffin containing various anti-wear and extreme pressure additives were investigated using an Optimol SRV reciprocating motion friction and wear tester. Results showed that the laser-cladding coating considerably decreased coefficient of friction and increased wear resistance in sliding against AISI 52100 steel and attributed to the change in the hardness, phase composition of the laser-cladding coating and tribochemical reactions between the laser-cladding coating and the extreme pressure and anti-wear additives.

Abstract: Using as high strength and corrosion resistance of tubing material, the wear properties of TC4 alloy and P110 tubing steel were comparatively studied, the differences and similarities were analyzed that are weight loss of wear rate and friction coefficient and topography of wear mark, the wear mechanism was discussed. The results showed that the topography of TC4 alloy and P110 tubing steel are different entirely, TC4 alloy is furrow, P110 tubing steel is wear pit, the wear resistance of P110 tubing steel is excelled obviously than TC4 alloy, the wear mechanism of TC4 alloy is delamination wear and adhesive wear and fatigue wear. The wear mechanism of P110 tubing steel is delamination wear and abrasive wear.