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The System Manganese Oxide-Alumina in Air

1962; Wiley; Volume: 45; Issue: 6 Linguagem: Inglês

10.1111/j.1151-2916.1962.tb11144.x

1551-2916

Thiagu Ranganathan, B. E. MacKEAN, Arnulf Muan,

Metallurgical Processes and Thermodynamics

The quenching technique has been used to determine equilibrium relations among the various phases in the system manganese oxide‐alumina in air in the temperature range 800° to 1765°C. Three isobaric invariant situations have been determined, as follows: Tetragonal Mn 2 O 3 solid solution, Mn203 solid solution, corundum, and gas (PO 2 = 0.21 atm) coexist in equilibrium at 881°± 5°C. Tetragonal Mn 3 O 4 solid solution, spinel solid solution, corundum, and gas are the phases present together in equilibrium at 990°± 5°C. Spinel solid solution, corundum, liquid, and gas coexist in equilibrium at 1740°± 10°C.