Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Reexamination Certificate
2004-11-20
2010-12-14
King, Roy (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
C148S240000, C148S284000, C148S286000, C148S287000, C427S372200
Reexamination Certificate
active
07850791
ABSTRACT:
Alloys containing aluminium are characterised by an outstanding oxidation resistance at high temperatures, that is based on, inter alia, the formation of a thick and slow-growing aluminium oxide layer on material surfaces. If the formation of the aluminium oxide layer reduces the aluminium content of the alloy so far that a critical aluminium concentration is not reached, no other protective aluminium oxide layer can be formed. This leads disadvantageously to a very rapid breakaway oxidation, and the destruction of the component. This effect is stronger at temperatures above 800° C. due to the fact that, often at this point, metastable Al2O3modifications, especially θ- or γ-Al2O3, are formed instead of α-Al2O3that is generally formed at high temperatures. The above-mentioned oxide modifications are disadvantageously characterised by significantly higher growth rates. The invention relates to methods whereby aluminium-containing alloys advantageously form an oxidic covering layer predominantly consisting of α-Al2O3, at a temperature higher than 800° C., especially in the initial stage of oxidation, and thus have a significantly improved long-term behaviour.
REFERENCES:
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Joseph R. Davis, ASM Handbook-Chromate Coatings On Specific Metals, 1992, ASM International, 9th Edition, vol. 13, 394.
Fogarty Caitlin
Forschungszentrum Julich GmbH
King Roy
Myers Jonathan
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