The reaction behavior of a-Boron nitride (BN) powder in wet air was investigated at 1273 K using thermogravimetric (TG) analysis, X-ray diffraction (XRD), and mass spectrometry. Scanning electron microscopy and electron probe X-ray microanalysis (EPMA) were used to analyze the morphological and elemental development of the sample. The results show that the reaction process consists of two stages: the oxidation of BN powder to form B 2 O 3 and the further reaction of B 2 O 3 with H 2 O. In the first stage, the oxidation reaction occurs very quickly and can be described by Chou's model. In the second stage, the reaction rate followed the linear rate law.
The phase equilibria and liquidus temperatures in the system ZnO-''FeO''-Al 2 O 3 -CaO-SiO 2 in equilibrium with metallic iron have been determined experimentally in the temperature range of 1423 K to 1553 K. The experimental conditions were focused on the composition range relevant to Imperial Smelting Furnace slags. The results are presented in the form of a pseudo-ternary section ZnO-''FeO''-(CaO + SiO 2 + Al 2 O 3 ) in which CaO/SiO 2 = 0.93 and (CaO + SiO 2 )/ Al 2 O 3 = 7.0. It was found that wustite and spinel are the major primary phases and that zincite and melilite are also present in the composition range investigated. Wustite (Fe 2+ ,Zn)O and spinel (Fe 2+ ,Zn)O (A1,Fe 3+ ) 2 O 3 solid solutions are formed in this system, and the ZnO concentration in the spinel phase is found to be much greater than in the liquid phase.
The effect of alumina on the liquidus temperatures of fayalite slags at iron saturation has been investigated experimentally. Equilibrated synthetic slags were quenched, and the samples were subsequently examined using optical microscopy and electron probe microanalysis (EPMA). The isotherms in the fayalite primary field and boundary lines were determined, and the results were presented in the form of pseudo-ternary phase diagrams of "FeO"-CaO-SiO 2 with 0, 2, 4, and 6 wt pct Al 2 O 3 in the slag. The experimental results show that the alumina addition expands the fayalite primary phase field and decreases the liquidus temperatures in the fayalite primary phase field.
An experimental study on the ternary system PbO-ZnO-SiO 2 in air by high-temperature equilibration and quenching techniques followed by electron probe X-ray microanalysis was carried out as part of the wider research program on the six-component system PbO-ZnO-SiO 2 -CaO-FeO-Fe 2 O 3 , which combines experimental and thermodynamic computer modeling techniques to characterize zinc and lead industrial slags. Liquidus and solidus data were reported for all primary phase fields in the system PbO-ZnO-SiO 2 in the temperature range 640 ЊC to 1400 ЊC (913 to 1673 K).
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