期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 87, 期 9, 页码 1701-1705出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2004.01701.x
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The volatility of alumina in high-temperature water vapor was determined by a weight loss technique. Sapphire coupons were exposed at temperatures between 1250degrees and 1500degreesC, water partial pressures between 0.15 and 0.68 atm in oxygen, a total pressure of 1 atm, and flowing gas velocities of 4.4 cm/s. The water vapor pressure dependence of sapphire volatility was consistent with Al(OH)(3)(g) formation. The enthalpy of reaction to form Al(OH)(3)(g) from sapphire and water vapor was determined to be 210 +/- 20 Q/mol, comparing favorably to other studies. Microstructural examination of tested sapphire coupons revealed surface rearrangement consistent with a volatilization process.
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