نتایج جستجو برای: magnesium aluminate spinel
تعداد نتایج: 42527 فیلتر نتایج به سال:
It is now well accepted and demonstrated that calcium silicate, calcium aluminate and calcium sulfo aluminate (ettringite, AFm) phases exhibit a good capability to fix metals and metalloids. Unfortunately the role of minor phases and especially calcium-ferric aluminate phase, shorthand C4AF is not well defined. In other systems like in soils or sediments iron phases play a key role in the fixat...
Characterization of Magnesium/Barium Aluminates Spinel Synthesized by Sol-Gel Auto-Combustion Method
In this paper, the structure of Al2O3 is modified with magnesium to synthesize MgAl2O4 as an oxygen carrier (OC) support. The surface properties and structural stability of the modified support are improved by the incorporation of magnesium in the structure of the support and additionally by narrowing the pore size distribution (about 2.3 nm). Then, iron oxide is impregnated on both an Al2O3 su...
It is observed that large quantities of hydrogen (H2) are released at ambient temperatures during the mechano-chemical synthesis of the Li-Al-N-Mg-based hydride composites using an energetic ball milling in a unique magneto-mill. For the (nLiAlH4+LiNH2; n=1, 3, 11.5, 30) composite, at the molar ratio n=1, the LiNH2 constituent destabilizes LiAlH4 and enhances its decomposition to Li3AlH6, Al an...
This paper explores the sustainability aspects of binders used in concrete 3D printing. Firstly, a prospective approach to conduct sustainability-assessment based on life cycle printed structures is presented, which also highlights importance considering functional requirements mixes for The potential material production phase emphasized enhance 3DCP by reducing embodied impacts. literature dif...
OBJECTIVES Aim of the study was to analyze the mold filling capacity and the dimensional accuracy of a spinel-based investment for titanium castings. METHODS Expansion of the investment in dependence of the preheating temperature was measured in a dilatometer. The degree of transformation of MgO and Al2O3 to spinel (MgAl2O4) was evaluated by means of X-ray powder diffraction. Mold filling cap...
Introduction: Extraterrestrial spinel is a magnetic mineral that is found in melted micrometeorites, in the fusion crust of meteorites and meteoroid ablation droplets, and in various impact-derived spherules more or less preserved in marine sediments. This mineral can be distinguished from terrestrial spinel on the basis of high Ni content and a high ferric/ferrous ratio resulting from crystall...
Introduction: Type B Ca-Al-rich Inclusions (CAIs) from Allende reflect a variety of processes including crys-tallization from a liquid and subsolidus diffusion, oxidation , sulfidization, and alteration of igneous phases [1]. Allende TS 34 has atypically large spinel grains making this CAI an attractive candidate for investigating the effects of different processes on this phase [2-5] and, ther...
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