Stability of rare earth oxides in a moist environment at high temperatures-Experimental and thermodynamic studies. Part I: The way to assess thermodynamic parameters from volatilisation rates

作者：Courcot Emilie^*; Rebillat Francis; Teyssandier Francis; Louchet Pouillerie Caroline

来源：Journal of the European Ceramic Society, 2010, 30(9): 1903-1909.

DOI：10.1016/j.jeurceramsoc.2010.02.011

• Corrosion
• SiO(2)
• Y(2)O(3)
• Refractories
• Thermodynamics

A methodology based on a weight loss measurement was used to quantify the volatility of yttria in high temperature water vapor. This method was first assessed on silica. Sintered materials with a shape of pellets were exposed at temperatures between 1000 and 1400 degrees C in air with 50 kPa of water at atmospheric pressure, under a flowing gas velocity of 5 cm s(-1). Besides the volatilisation rate, the nature of the volatile gaseous species was determined using a kinetic study. Knowing the nature of flows in the furnace, partial pressures of yttrium (oxy-)hydroxide in equilibrium over Y(2)O(3) were calculated, and used to assess the enthalpies of formation of YO(OH) and Y(OH)(3).

• 出版日期2010-7