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Epitaxial oxide superlattices (SLs) of SrTiO 3 (STO) and Nb-doped SrTiO 3 (STNO) were fabricated on LaAlO 3 (LAO) (001) substrates by an ion beam sputter deposition (IBSD) system having double electron cyclotron resonance (ECR) ion guns. The [STO x /STNO y ] 10 SLs were epitaxially grown at different stacking sequences (x = 6 nm, y = 1–6 nm) and maintained...
Aluminum oxide films were deposited on fused silica and borosilicate glass substrates by electron beam evaporation, without any substrate heating. Grazing incidence X-ray diffraction measurements found that a layer of crystalline aluminum silicate hydroxide was formed at the interface of the substrate and the amorphous alumina film, the latter transformed to γ-alumina phase on heat treatment at 800 °C...
Silver-containing stainless steels have shown broad spectrum antibacterial activities and exhibit potential applications in food industries and medical appliances. However, few results associated with the antibacterial process have been reported to uncover the interaction of silver implanted stainless steel and bacteria. In this paper we made a preliminary study on antibacterial mechanisms of silver...
A plasma-surface technique was used to form a TiAl–Cr alloy on the surface of a TiAl-based alloy. The feasibility of the alloying process was evaluated by a first principle calculation method. The preparation process was optimized by investigating the effects of processing temperature and discharge pressure on the formation of surface alloy. The calculation using the first-principle method showed...
Due to a lack of crystalline structures and grain boundaries, metallic glasses exhibit extremely high strength and superior resistance to corrosion. They are also supposed to be resistant against displacive irradiation due to their inherent disordered structure, thereby are potential candidates for applications in irradiation environments. In this work, the irradiation effects of Zr- and Ti- based...
Biomedical titanium alloy (Ti–6Al–4V) has good mechanical properties and cytocompatibility but post-operative implant-related bacterial infection is a big concern. Therefore, it is very important to suppress adhesion of bacteria on the implants or even kill the bacteria by proper surface modification. In this study, oxygen plasma immersion ion implantation (O-PIII) is employed to produce antibacterial...
Silicon samples were implanted with up to 6E+16 cm −2 of 190 keV manganese and next treated with plasma pulses of duration about 1 μs and energy density up to 4 J cm −2 . Channelled RBS spectra measured after pulse treatment reveal nearly perfect recovery of crystalline order with manganese segregated towards the surface and occupying non-substitutional positions. SQUID magnetization...
Copper nitride films were deposited on glass substrates by reactive DC magnetron sputtering at 100 °C substrate temperature. The influence of N 2 -gas flow rates on the structure, resistivity and microhardness of deposited films was investigated. X-ray diffraction measurements showed that the films were composed of Cu 3 N crystallites with anti-ReO 3 structure and exhibited...
Crystalline TiO 2 thin films were synthesized on the Si and glass substrates by reactive sputtering in a HIPIMS+ coating system. The films with a bit oxygen deficiency were deposited on the Si and glass substrates at oxygen flux rate of 10sccm. The phase structure of the films changed with varying the parameters the MPP power pulse, the bias voltage, and working gas pressure. Anatase-dominant,...
The dynamic behavior of water within ion beam (10 keV Ar + , 1.0 × 10 16 –1.2 × 10 17 ions/cm 2 ) modified perfluorosulfonic acid (PFSA) membranes was investigated at room temperature by combining direct-current (DC) resistance with alternative-current (AC) impedance methods under a water-saturated air atmosphere. The bulk impedance in existing surface sulfonate groups...
Cr/CrN multilayer coatings with varied individual layer thickness were synthesized by arc ion plating. The SEM results confirmed the clear periodicity of these coatings. They are known to contain bcc Cr, fcc CrN and hcp Cr 2 N phase by XRD patterns tested. The polarization curves show that the corrosion potential of the coatings with modulation periods of 603, 862, 1351 nm are more negative...
The multiwalled carbon nanotubes (MWCNTs) were prepared on SiO 2 substrates using chemical vapor deposition (CVD). N ion beam bombardment to MWCNTs was performed at different beam currents of 5–15 mA in an ion-beam-assisted deposition (IBAD) system. Scanning electron microscope (SEM) and Transmission electron microscope (TEM) proved no significant crack and surface morphological change for...
Three kinds of hard coatings, TiSiCN, TiCrSiCN and CrSiCN were deposited on WC/Co alloys by plasma enhanced magnetron sputtering (PEMS) technique. Those coatings were comparatively studied with respect to their microstructure and mechanical properties. The sliding tribological behaviour of the coatings against Ti6Al4V counterpart was also studied by pin-on-disc tests. The results indicated that TiN...
To realize the effect of surface topography on tribological behaviour in microforming, the surface of a copper thin sheet was modified using ion beam irradiation equipment to change the micro-topography of the surface. The surface quality was evaluated by the surface roughness using SEM and AFM. A serial of strip drawing experiments were carried out to analyse the effect of surface modification on...
Hydrogenated amorphous silicon germanium (a-SiGe:H) alloys were prepared by plasma enhanced chemical vapor deposition (PECVD) at different deposition temperatures. The optical, optoelectronic properties and the microstructure of the prepared a-SiGe:H alloys were investigated systematically by transmission, photo/dark conductivity, Raman, and Fourier transform infrared (FTIR) spectroscopy measurements...
Zinc Oxide (ZnO) thin films were prepared by cathodic vacuum arc deposition (CVAD) and filtered cathodic vacuum arc deposition (FCVAD) technology with a mixture of O 2 , Ar and N 2 . XRD patterns indicated that ZnO thin films prepared by CVAD had a combined orientation of ZnO (002) and ZnO (101). The preferential orientation ZnO (002) could be obtained at an optimum deposition pressure...
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