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The effects of solutionizing cooling processing (the interrupted water-cooling and direct water-cooling) on the number and size distribution of γ″ (Ni3Nb) phase, as well as work hardening characteristics during hot tensile deformation, of a Ni-Fe-Cr-base superalloy are investigated. It is found that γ″ phase and work hardening characteristics are sensitive to the solutionizing cooling processing....
Ferromagnet/Superconductor (F/S) bilayer hybrids show exclusive states due to the mutual interaction between the superconductor and the underlying ferromagnetic substructures in micron scale. In this work, we aimed to observe the effects of the interaction between superconductivity and magnetism, especially the phenomenon involving the orientation and the size of magnetic stripes has been investigated...
A double-sided radiating flat-panel X-ray source device has been developed. The device has a diode configuration composed of an anode target of a tungsten thin film and field-emitter arrays of ZnO nanowires prepared on glass substrates. The X-ray radiation comes from both transmission and reflection of X-rays induced by electron bombardment. When operated at 24 kV with an anode current of 3.16 mA,...
SiO2f/SiO2 composites were fabricated by sol-gel method, and then the effects of high-temperature (1000–1400 °C) annealing on the microstructure and mechanical property were discussed and compared. The results showed that the composites underwent obvious structural changes after high-temperature annealing. High-temperature annealing markedly affected the mechanical property that decreased with increasing...
One-dimensional growth of copper (Cu) is observed when Cu is deposited on cuprous iodide (CuI) films at elevated temperatures by thermal evaporation in high vacuum. The morphology, crystallinity, and chemical composition were examined for the samples using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron...
To resolve a general problem that exist differences between the vacuum furnace instrument display temperature (TD, detected by thermocouple generally) and that on the substrate surface (TS) for growing thin films, we present here an effective method for measuring the real TS values as well as correcting the temperature difference between TD and TS. Concurrently, a set of heat conduction models, which...
The research presented in this paper concentrates on determining the influence of temperature and time parameters on the process of growth, the thickness, mechanical properties and roughness of oxide layers obtained on titanium Grade 2. It has been found that the temperature has a more important influence on the process of forming oxide layers on titanium than time. Increasing the oxidation temperature...
Using monoenergetic X-ray photons from Indus-2 synchrotron Centre, the Coster-Kronig vacancy factor(κ) for L3 subshell X-rays of some lanthanide elements such as Gd, Tb, Ho and compounds such as Pr2O3, Pr2(CO3)3·8H2O, Nd2O3, Sm2O3, Sm2(CO3)3.2.85H2O, Sm2(SO4)3·8H2O, Gd2(CO3)3, Tb2O3, Dy2(SO4)3, Ho2O3 and HoF3 have been determined experimentally. By measuring Lα X-ray production cross-section, the...
Plasma electrolytic oxidation (PEO) coating was prepared from aluminate electrolyte on low carbon steel. The structure, composition, microhardness, anti-wear and anti-corrosion properties of the PEO coating were explored. The results show that the PEO coating possesses a uniform and dense structure and is mainly composed of α-Al2O3 as well as some γ-Al2O3 and Fe3O4. The PEO coating exhibits lower...
Prolonged annealing of pentacene thin films in air leads to the formation of nano- and micro-scale rod-shaped structures at temperatures equal to or higher than 130 °C. Scanning electron microscopy measurements indicated their crystalline structure, while UV–vis absorption spectra revealed presence of different species of oxidized pentacene, including 6,13-pentacenequinone. The mechanism of growth...
The spindle-like ZnO microparticles were successfully synthesized by a simple hydrothermal method using triethanolamine (TEA) as the surfactant. The phase components, particle sizes and morphologies of ZnO samples derived from different contents of TEA (3, 4, 5, 6 and 7 mL) were characterized by XRD, SEM, TEM, EDS and BET. The photocatalytic activity of ZnO microparticles with different morphologies...
The structural changes, migration behaviour of indium (In) implanted into glassy carbon (GC) and the effect of annealing on radiation damage introduced by ion implantation have been investigated. The GC substrates were implanted with 360 keV indium ions to a fluence of 2.0 × 1016 ions/cm2 at room temperature (RT) and 350 °C. The RT implanted samples were isochronally annealed in vacuum between 200...
AZ31 Mg alloy/unidirectional carbon fiber (UCF)/AZ31 composite sheets were fabricated with AZ91 Mg alloy powder as an adhesive using vacuum hot pressing (VHP) at various temperatures. Both the wettability and bonding strength of the UCF/AZ91 interfaces increased with increasing VHP temperature, resulting in an improvement of the mechanical properties of the composite sheets. The fracture mechanism...
The (MoO3)0.4(V2O5)0.6 microsheets have been successfully prepared onto the glass substrates using chemical spray pyrolysis (CSP) deposition method at optimized substrate temperature of 400 °C. The structural characterization using XRD confirm that both MoO3 and V2O5 exhibit an orthorhombic crystal structure. The two-dimensional FE-SEM micrograph shows the more porous distribution due to the random...
The rf-sputtered MoS2-Au composite films were exposed in real low earth orbit (LEO) space environment by a space environment exposure device (SEED) aboard China Shenzhou-7 manned spaceship. The ability of the composite films resistant to atomic oxygen (AO) was investigated using X-ray photoelectron spectroscope (XPS), X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM)...
Modal analysis is a crucial parameter in the design process of turbomolecular pumps, as rotor resonance will seriously affect the stability and reliability of the pump. Suitable modeling is important since it will decide the quick and accurate calculation of the rotor modes. This work focuses on the modeling method and the analysis of the rotor blade modes of the turbomolecular pump. A simplified...
This paper describes the hypervelocity impact behavior and the residual strength of carbon fiber reinforced carbon (C/C) composites under different impact velocity. Impact tests of 2.5D C/C composite samples have been performed using one stainless steel ball driven by solid explosive to detect correlations between the impact direction and damage distribution and the residual flexural strength of the...
The gas breakdown in the Inertial Electrostatic Confinement (IEC) device has been studied by DC discharge of Nitrogen gas in the pressure range between 0.03 Torr and 0.7 Torr. Paschen curves and Townsend coefficients are obtained in a cylindrical system with inner anode in shape of rods and the outer grid cathode. The breakdown occurs and the plasma is formed at the center of the electrodes. Townsend...
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