Hybrid intermetallic composites (HICs-aluminum based matrix, new hybrid design) reinforced with titanium nitride (TiN) and alumina (γ-Al2O3) were designed manufactured through the innovative combined method of sinter + forging. This results in highly dense materials with, general, improved mechanical properties. In TiN content was varied (10, 20 30 wt %) but γ-Al2O3 kept constant at 10 wt%. Add...

Levulinic acid (LA), 4-oxo-pentanoic acid, is a new platform chemical with various potential uses. In this paper, catalytic hydrogenation and oxidation of levulinic acid were studied. It was shown from experiments that levulinic acid can be hydrogenated to γ-valerolactone (GVL) over transition metal catalysts and oxidative-decarboxylated to 2-butanone (methyl-ethyl-ketone, MEK) and methyl-vinyl...

Alkali carbonate melts are promising high temperature thermal storage media. In this work five alumina forming alloys have been exposed to a ternary LiNaK melt and CO2 at 800 °C. The corrosion propagation was found depend on the formation of slow-growing LiAlO2 scale. Furthermore, two polymorphs contributing phase were monitored for up 1000 h: dense α-LiAlO2 scale γ-LiAlO2 crystallites. We sugg...

Abstract Alumina ( α - and γ -Al 2 O 3 ) particles are formed in liquid Al-Mg alloys during the dealing cast processes. These native oxide have non-trivial influences on microstructures properties of solidified parts, may act as potential heterogenous nucleation sites solidification. At present there is still a lack understanding about interaction atomic arrangements at interfaces between liqui...

Mesoporous Ni–alumina catalysts (Ni–alumina-pre and Ni–alumina-post) were synthesized by one-step sol–gel method using micelle complex comprising lauric acid and nickel ion as a template with metal source and using aluminum sec-butoxide as an aluminum source. The Ni–alumina catalysts showed relatively high surface areas (303 m/g for Ni–alumina-pre and 331 m/g for Ni–alumina-post) and narrow por...

In this paper, we consider the derivation of the modified Wenzel’s and Cassie’s equations for wetting phenomena on rough surfaces from a three-dimensional phase field model. We derive an effective boundary condition by asymptotic two-scale homogenization technique when the size of the roughness is small. The modified Wenzel’s and Cassie’s equations for the apparent contact angles on the rough s...

We investigate, using the framework of Γ-convergence, a phase-field model proposed in [Torabi et al, Proc. R. Soc. A, 2009] for strongly anisotropic systems; in particular, we prove a full Γ-convergence result for an anisotropic Modica-Mortolatype energy.

In the secondary circuit of nuclear Pressurized Water Reactors, corrosion products and impurities lead to formation undesirable hard deposits, called sludge, on tube sheet steam generators. Theses deposits are mainly composed iron (magnetite), alumina silica. The sludge piles is investigated by reproducing reaction precursor oxides in conditions generator (275 °C, 58 bar). Mixtures magnetite, γ...

g-Alumina nanoparticles (g-Al2O3 NPs) were prepared via a new and simple synthetic route and characterized by field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The catalytic activity of prepared g-Al2O3 NPs was investigated for the new one-pot, ...