Enthalpies of Chromium Oxide Solution in Soda Lime Borosilicate Glass Systems

Abstract

Chromium oxide (Cr 2 O 3 ) solubility was measured in soda lime borosilicate glass from 1400 to 1500 K. The temperature dependence of the solubility increased with increased sodium oxide concentration. The enthalpies of solution for the equilibrium phases were calculated from the solubility data in the temperature range from 1400 to 1500 K. The enthalpy of fusion for Cr 2 O 3 at 1450 K was calculated to be 108.0 kJ⅐mol ؊1 . This value was less than our measured values for enthalpy of solution, 111.0 ؎ 0.5 and 158.4 ؎ 0.3 kJ⅐mol ؊1 , indicating that all enthalpies of mixing were positive; that is, the mixing process was endothermic. This characterized the interaction between solute and solvent as repulsive.

Correlation between chromium physicochemical properties in silicate melts and the corrosion behavior of chromia-forming alloy

“…Besides their good mechanical strength at high temperature, these alloys are able to develop a Cr2O3 protective oxide layer when oxidized. Chromium oxide provides a suitable protection against corrosion induced by glass melts due to the low solubility limit of chromium in silicate melts [4][5][6]. The stability of this Cr2O3 layer is therefore dependent on the physicochemical properties of the melt and of chromium in the melt.…”

Sodium Fluoride Solubility and Crystallization in Photo‐Thermo‐Refractive Glass

“…Several studies have been devoted to processes of dissolution and precipitation of crystals in glass forming melts of both natural and manufactured origins, 11–14 but none has been dedicated to PTR glass. The present paper aims at the study of NaF solubility in PTR glass.…”

Corrosion and depassivation of a chromia-forming Ni-based alloy in the 0.75Na2O-B2O3-2.75SiO2 melt

“…Pre-oxidation was then commonly used for corrosion resistance studies [6,7]. The efficiency of the preoxidation is explained by the compactness of the chromia layer formed by oxidation in air as well as the low solubility of chromia in molten silicates [8], which induces a limited recession of the passive layer and thus confers its protective properties against high temperature corrosion by molten silicates [9][10][11]. The knowledge of the conditions of stability of this protective oxide layer is the key to predict the corrosion rate of the material and thus its durability.…”