The densification behavior, microstructure and mechanical properties of bulk TiB₂-based ceramic composites, fabricated using the spark plasma sintering (SPS) technique with elements of (Fe-Ni-Ti-Al) sinter-aid were investigated. Comparing the change of shrinkage displacement of pure TiB₂ and TiB₂-5 wt% (Fe-Ni-Ti-Al), the addition of elements Fe-Ni-Ti-Al into TiB₂ can facilitate sintering of the...

The paper describes the technology of nickel-alumina composite coatings obtained by low-pressure cold spray (LPCS). content alumina reinforcement was optimized mixing commercial K32, being a mechanical mixture Al2O3 + 50 wt% Ni, with Ni-cladded powders developed in present study. cladded were prepared hydrogen reduction method. Two including Ni-films covering particles developed: 70 Ni (powder ...

The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts. The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and used to determine acti...

this paper deals with the determination of displacement function and thermal stresses of a finite length isotropic functionally graded hollow cylinder subjected to uniform temperature field. the solution of the governing thermoelastic equation is obtained, as suggested by spencer et al. for anisotropic laminates.  numerical calculations are also carried out for fgm (functionally graded material...

An active and stable catalyst for dry reforming of methane composed Ni0 nanoparticles highly dispersed on a lamellar alumina was prepared by employing sacrificial metal–organic framework derived from PET wastes.

Ni/Al2O3 is an active catalysts for CO2 hydrogenation to both CH4 and CO. By doping with Ga, we succeeded in shifting the selectivity of these almost completely toward In-situ IR spectroscopy studies showed that catalyst activity directly related concentration surface hydroxyl groups are responsible adsorption formation intermediate bicarbonates formates on surface. The addition Ga improved Ni ...

Role of transition metals (Ni, Cu, Fe, and Zn) on MoS2 supported alumina was studied for the HDO propylguaiacol (PG) to produce aromatics, cycloalkanes, phenolics. A kinetic model proposed elucidating reaction pathway PG.