Discontinuously reinforced aluminum metal matrix composites (MMCs) with about 20 vol.% reinforcement produced by powder metallurgy (PM) are attractive for many structural applications because of their high specific strength and stiffness. While they exhibit reduced ductility and toughness at room temperature, many of them can be superplastically deformed at high-strain rates in the vicinity of ...

A series of model-supported WO3 catalysts were synthesized on preformed Al2O3, Nb2O5, TiO2, and ZrO2 supports by impregnation of aqueous ammonium metatungstate, (NH4)10W12O41·5H2O. The molecular and electronic structures of the supported tungsten oxide phases were determined with in situ Raman and UV–vis spectroscopy, respectively. The supported tungsten oxide structures are the same on all oxi...

Microchannel plate (MCP) as a key part is a kind of electron multiplied device applied in many scientific fields. Oxide thin films such as zinc oxide doped with aluminum oxide (ZnO:Al2O3) as conductive layer and pure aluminum oxide (Al2O3) as secondary electron emission (SEE) layer were prepared in the pores of MCP via atomic layer deposition (ALD) which is a method that can precisely control t...

M. Gombar, J. Kmec, Faculty of Management, University of Presov, Presov; M. Badida, L. Sobotova, Faculty of Mechanical Engineering, Technical University of Kosice, Košice, Slovakia The contribution researches and solves the suitability of utilize of electrolyte, consisting of the oxalic acid, boric acid, sodium chloride and aluminium cations in the process of anodizing aluminium in operating co...

The presence of excess hydrogen at the interface between a metal substrate and a protective oxide can cause blistering and spallation of the scale. However, it remains unclear how nanoscale bubbles manage to reach the critical size in the first place. Here, we perform in situ environmental transmission electron microscopy experiments of the aluminium metal/oxide interface under hydrogen exposur...

Figure 2: n-GaSb/Al2O3 MOSCaps without (a) and with (b) InAs showing improvement in C-V characteristics with the InAs interface layer. Figure 1: TEM image showing the GaSb/InAs/Al2O3 gate stack with EDS scan to confirm the InAs interface layer. A highly reactive GaSb surface was passivated by growing a thin epitaxial InAs capping layer to improve the GaSb/high-k oxide interface. MOSCap structur...

T h e prepara t ion and propert ies of combined a luminium oxide coatings have been investigated. T h e coating has been prepared in two steps. First , a luminium subs t ra te was anodically oxidized. In t he next s tep the anodized film has been coated by the sol-gel method . T h e condit ions of forming coatings wi thout shrinkage were obta ined empirically. It was found out t h a t the film ...

High-aluminium steels contain a significant amount of aluminium. The reaction between Al in the liquid steel and SiO2 lime-silica-based mould powders during continuous casting process high causes chemical compositional changes powders, subsequently affecting surface quality slabs. In order to solve aforementioned problem, lime-alumina-based have been developed, which can lead an increase cast s...