Oxidation of n-pentane with molecular oxygen to sec-pentanols was performed in the presence of a free radical initiator (di-tert-butyl peroxide) and a boron compound (sec-butyl metaborate), with in situ adsorption of water on molecular sieve 3 A. Kinetics of the reaction was studied in a laborat...

In this work, a novel way was developed to facilitate the sintering of a binderless cemented carbide with Al2O3 contain while improving its toughness. WC- 1.87 wt % Al2O3- 4.13 wt %ZrO2 cemented carbides with 1 wt % B2O3 as additives were consolidated by high energy ball-milling and spark plasma...

This study focuses on the characterization of heavy metal oxide glasses containing CeO2 as dopant with the aim to enhance its density, as many optical applications of glasses (eg: heavy particles measurement in high energy physics) are heavily dependent on the density of the glass itself. Differ...

The formation of aluminum borates (Al18B4O33 and Al4B2O9) from alumina and boron oxide occurs between 600 and 800 °C. These materials have refractory properties and corrosion resistance. The objective of this work is to develop materials from the Al2O3-B2O3 system, employing alumina and boric a...

Single-crystal and uniform aluminum borate (Al4B2O9)-coated aluminum oxide nanowires have been synthesized in high purity and in large yield via a reaction of metal aluminum with boron oxide in the presence of carbon nanotubes (CNTs). The aluminum oxide nanowires exhibit a well-crystallized one-...

The effect of zinc borate (ZnB) on the thermal and flame retardant properties of polyamide 6 (PA 6) composites containing aluminum hypophosphite (AlHP) was examined. The properties of the composites were investigated using thermogravimetric analysis (TGA), limiting oxygen index (LOI), horizontal...

The effects of hexitols which are stereoisomers (d-glucitol, d-galactitol and d-mannitol) on the hydration of a tricalcium aluminate-calcium sulfate mixture with calcium hydroxide in paste were assessed and compared. The interactions of the molecules in solution and at the solid-liquid interface...

In this paper, the effects of curing temperature on the hydration of calcium aluminate cement (CAC) dominated ternary binders (studied CAC: Portland cement: calcium sulfate mass ratio were 22.5: 51.7: 25.8) were estimated at 0, 10, 20 and 40 °C, respectively. Both α-hemihydrate and natural anh...

This paper reports a study of ternary blends composed of calcium aluminate cement, calcium sulfate hemihydrate and limestone. Compressive strength tests and hydration kinetics were studied as a function of limestone and calcium sulfate content. The phase evolution and the total porosity were fol...

Comparative study of the broadband down-conversion processes in Bi3+–Yb3+-codoped yttrium oxide (Y2O3) and various yttrium–aluminum oxides (Y3Al5O12, YAlO3 and Y4Al2O9) has been performed from the point of view of search for materials suitable for enhancement of efficiency of silicon solar cel...

In this study, we evaluated the structural, chemical, and electrical properties of ternary alloy aluminum yttrium oxide (Al2-xYxO3) films prepared by employing a low-cost spin-cast technique. Al2-xYxO3 films annealed at 400 °C were found to possess smooth and excellent insulating characteristic...

The nanophosphors of europium doped yttrium aluminum oxide were synthesized by a hydrothermal method. As the amount of La3+ ions substituted in yttrium sites was increased, the crystal structure was transformed from pure garnet to perovskite phase through the mixed phase of garnet and perovskite...

The microstructure of the zirconium modified and non-modified aluminide coatings was examined by the EDS, XRD, TEM and the positron annihilation spectroscopy methods. Both coatings have a double layer structure: β-NiAl phase on the top and γ′-Ni3Al below. Small zirconium nanoparticles were fo...

Here we show a fast and direct zirconium aluminide alloys manufacturing process using the microwave-assisted technique. The rapid microwave-assisted synthesis was performed using two different starting precursors (Zr and ZrH2) revealing the ZrAl3 phase as the main phase formation, with a small p...

Sprayed slurry aluminide and nickel-aluminide coatings deposited by means of electrodeposition and slurry application to 9 wt% Cr P91 alloy were studied to mitigate molten salt corrosion in concentrated solar power plants. Both coatings were tested isothermally at 580 °C in contact with the Sol...

The structure of the surface of coatings formed on steel C1030 by the method of electrospark alloying after tests for heat resistance in the air by the thermal cycling method is studied. The coatings were formed using cathode Ni and nickel aluminides with different phase composition NiAl, Ni3Al,...

The hydrolysis kinetics of aluminum and zirconium oxychloride salts in the presence of carbamide was investigated. The determined rate constant varies in the range of 0.0027–0.0038 min−1 and is independent on initial mixture composition. The effect of initial components molar ratio and concentr...

Zirconium (Zr) is used in modern aluminum alloys to form dispersoids that control grain structure. The interaction of these dispersoids with the alloying elements used to strengthen aluminum remains poorly understood. We have used high resolution imaging and composition analysis via electron mic...

Co-sputtering and post-sputter oxidation were incorporated as a two-step growth route for the formation of ternary aluminium doped zirconium oxide (AlxZryOz) films on silicon (Si) substrate using Al-Zr alloy film as the template film. Post-sputter oxidation at 400, 600, 800, and 1000 °C has tra...

Micro cold forming processes sometime require thin sheets of high strength materials often with a thickness below 30 μm to manufacture products with good mechanical properties. Due to its high strength and anti-recrystallization properties, aluminum–scandium is a promising material for such pr...