1,721,301 research outputs found
Self-sustained Combustion Synthesis and Asbestos-bearing Waste: Scaling up from Laboratory Towards Pre-industrial Size Plant
No full textAbstractAn apparatus and a technique were developed for triggering the breakdown reaction of chrysotile by means of a combustion synthesis well known as Self-propagating High temperature Synthesis or SHS. The experiments were carried out varying different Asbestos-Containing Waste (ACW). The reactions were carried in a continuous-feeding configuration, indispensable for the development and fine-tuning of the process parameters towards industrial scale up. Experiments demonstrated to be effective in destructing the fibrous habit of chrysotile. The SHS process in comparison with conventional thermal treatments, due to fast reaction time and low activation energy, positively reflects into time and costs of the process
The induction assisted chemical oven technique (INDACO) applied to the nitridation of b-Ti63Nb37
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Decomposition of (Sn2xFe1-xSb1-x)O4 solid solutions with x ≤ 0.50
No full textThermal stabilities of the rutile-type (Sn2xFe1xSb1x)O4 solid solutions with x 0:5 were investigated by TG–DTA in flowing O2 up to 1673 K. After thermal analysis the samples were characterised by means of powder X-ray diffraction analysis (XRD), optical and scanning electron microscopy (SEM) observation and electron dispersive spectrometry (EDS) analysis. The decomposition of the solid solution involves the formation of hematite and a volatile Sb oxide, probably Sb4O6. The decomposition temperature increases with the Sn content of the solid solution
Decomposition of (Ti2x,Fe1-x,Sb1-x)O4 solid solutions below 1673 K
No full textThe pseudo-binary TiO2–FeSbO4 system was investigated by means of thermogravimetric analysis below 1673 K in O2. Rutile-type solid solutions were synthesised at 1373 K in O2 by means of a solid state reaction between the two pure end members TiO2 (rutile) and FeSbO4 mixed in stoichiometric amounts. Thermal stability of the (Ti2xFe1−xSb1−x)O4 solid solution increases with rutile content; equimolar (Ti1.00Fe0.50Sb0.50)O4 solid solutions decompose at about 1673 K forming a TiO2-enriched solid solution and FeSbO4, that subsequently decomposes into Fe2O3 (hematite) and a volatile Sb oxide, probably Sb4O6. For compositions characterised by higher Ti content the decomposition temperature is higher than 1673
Thermodynamic and pseudo binary phase diagram of REBa2Cu3O7-x – ”Ba2Cu5O7” systems (RE=Nd, Sm, Eu). The effect of oxygen pressure
No full textIn this work the effect of oxygen pressure on the primary crystallisation fields for REBa2Cu3O7–x (RE=Nd, Sm, and Eu) has been studied. A DTA apparatus has been modified in order to carry out analyses under gas pressure, so the trend of temperatures of peritectic decomposition of the
REBa2Cu3O7–x phases and of the eutectic equilibrium involving REBa2Cu3O7–x phases and flux mixture
‘Ba2Cu5O7’ have been studied at oxygen pressures of 0.21, 1, and 10 atm. This showed that primary crystallisation fields spread at the increase of the oxygen pressure and allowed us to calculate the enthalpies of reactions of REBa2Cu3O7–x phases too
Transition metal carbides: dependence of some thermochemical quantities on the chemical nature of reactants and stoichiometry of product
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