Characterization of oxide scales formed in very low oxygen potentials
- Unidad Merida, Cordemex (Mexico). Centro de Investigacion y de Estudios Avanzados
- Research Centre Juelich GmbH, Juelich (Germany). Inst. for Materials in Energy Systems
Samples of alloy 800 H (UNS N08810) and alloy 617 (LTNS N06617) were oxidized in a simulated process gas atmosphere. The principal elements of the gaseous environment were 50% H{sub 2}O, 35% H{sub 2} and 5% of CO{sub 2}, CO, and CH{sub 4}, respectively and a total pressure of 140 kPa. This gas in a state of thermodynamic equilibrium establishes oxygen partial pressures ranging from 3.0 {times} 10{sup {minus}17} kPa, at 800 C to 3.2 {times} 10{sup {minus}14} kPa at 950 C. The exposure time was from 600 to 5,000 hours. After the exposure the alloy surfaces showed compact oxide layers. On alloy N08810 a double oxide layer was built. A first layer was identified as the spinel phase, Mn{sub (1+x)}Cr{sub 2(1{minus}x)}Ti{sub x}O{sub 4}. The second one is the corundum type phase, Cr{sub 2{minus}y}Ti{sub y}O{sub 3}. On alloy N06617, lack of manganese produces the growth of a single layer, which was also identified as the phase Cr{sub 2{minus}y}Ti{sub y}O{sub 3}.
- OSTI ID:
- 271995
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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