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Comparing the Thermodynamic Behaviour of Al(1)+ZrO2(s) to Al(1)+Al2O3(s)In an effort to better determine the thermodynamic properties of Al(g) and Al2O(g). the vapor in equilibrium with Al(l)+ZrO2(s) was compared to the vapor in equilibrium with Al(l)+Al2O3(s) over temperature range 1197-to-1509K. The comparison was made directly by Knudsen effusion-cell mass spectrometry with an instrument configured for a multiple effusion-cell vapor source (multi-cell KEMS). Second law enthalpies of vaporization of Al(g) and Al2O(g) together with activity measurements show that Al(l)+ZrO2(s) is thermodynamically equivalent to Al(l)+Al2O3(s), indicating Al(l) remained pure and Al2O3(s) was present in the ZrO2-cell. Subsequent observation of the Al(l)/ZrO2 and vapor/ZrO2 interfaces revealed a thin Al2O3-layer had formed, separating the ZrO2-cell from Al(l) and Al(g)+Al2O(g), effectively transforming it into an Al2O3 effusion-cell. This behavior agrees with recent observations made for Beta-NiAl(Pt) alloys measured in ZrO2 effusion-cell.
Document ID
20050081853
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Copland, Evan (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
June 25, 2004
Publication Information
Publisher: ASM International/TMS
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
E-15032
Funding Number(s)
CONTRACT_GRANT: NCC3-850
WBS: WBS 22-714-30-05
CONTRACT_GRANT: NNC04AA7A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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