Cold Sintering Process has been applied to hydroxide precursors Al(OH)3, xH2O promote in situ reactive sintering. The application of sintering temperatures < 400°C led the release OH groups and partial crystallization into boehmite γ-AlOOH. This latter step is accompanied by a densification stage leading production dense translucent pellet. From skeletal density measurements, it appears that no...

The microhardness and abrasive wear resistance of cast Al-Si alloys after plasma-electrolytic oxidation (PEO) in a weakly alkaline basic electrolyte (3 g/L KOH + 2 Na2SiO3), as well with the addition H2O2, were determined. X-ray analysis showed that PEO layer comprises two oxide phases, namely α-Al2O3 γ-Al2O3, sillimanite -Al2O3 · SiO2 small percentage mullite -3 Al2O3 2SiO2. Silicon is present...

Despite the well-known beneficial effect of reactive element dopants on improving oxidation resistance alumina-forming alloys, many open questions remain, including migration and segregation elements at oxide/alloy interface, a key zone in controlling global kinetics interface adhesion. Herein, we elucidate atomic processes governing interfacial dynamics hafnium with γ-Al2O3 θ-Al2O3, two domina...

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...

This study processed the water vapor entrained in NaBH4 hydrogen production reaction inside primary tank through secondary tank, order to increase total production. γ-Al2O3 was used as carrier for hydrolytic tank. The chelated with metal catalyst Co2+ at different concentrations produce catalyst. Next, adopted concentration and bed temperatures were tested. tested using powder multiple NaBH4+ m...

Nano-sized γ-Al2O3 was synthesized successfully by a simple method using Al2(SO4)3·18H2O as aluminium source and in the presence of polyethylene glycol (PEG 2000). FTIR spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to characterize the structure and morphology of synthesized powder. The results showed that PEG playe...

Shock compression experiments achieving ≥100 GPa pressures are available for seven silicate liquid compositions in the system CaO-MgO-FeO-Al2O3-SiO2. Especially when liquid states have been sampled along multiple Hugoniots, these data are sufficient to evaluate the dependence of Grüneisen γ on volume in silicate liquids. The increase in γ upon compression in these liquids is a surprising featur...

In the framework of understanding the transport mechanism that governs the filtration of NO3- solution through a γ-Al2O3 membrane with a nominal pore size of 5 nm at low ultrafiltration, a series of various types of nitrate solutions and operating conditions were investigated. The effect of filtration parameters such as pH, applied pressure and NO3- concentration on the selectivity and permeabi...

Ferritic alumina-forming alloys showed high corrosion resistance to molten carbonates by forming a protective α-LiAlO2 scale at their surface. In this work, four ferritic were pre-oxidised before exposure (Li,Na,K)2CO3-melt 800 °C for 1000 h. Only outer transient alumina, such as γ-alumina, reacts with the melt, LiAlO2. At same time, innermost α-Al2O3 remains intact. α-Al2O3, well α-LiAlO2, are...

Particle morphology and surface properties of metal oxides are topics great importance in the field heterogeneous catalysis. Herein, we have developed a molecular-colloidal coassembly approach combined with an ultrasonic-assisted precipitation method to fabricate [email protected]γ-Al2O3 composites tuneable pore size well-defined octahedral-shape crystal structure. The supramolecular assemblies...