Investigations on the integrity of alumina scales on MA 956
The oxidation/corrosion resistance of service relevant materials strongly governs their applicability at elevated temperatures. Protection is generally achieved by the development and maintenance of appropriate scales such as Cr(2)O(3) or A1(2)O(3). An important aspect in terms of scale maintenance concerns its mechanical integrity (ie the resistance against initiation and growth of cracks which can result from thermal and mechanical stresses). Insufficient scale stability means a direct access of the environment to the unprotected material with the danger of unacceptable material degradation. For the scale integrity, inherent defects play a crucial role. In general, oxide scales do not grow defect free, but pores and microcracks exist, which act as sources of macroscopic damage. Therefore attention has to be paid to the generation, development and interaction of these defects and the related growth mechanisms in order to enable a reliable judgement of the material potentials.
Bibliographic Reference: Paper presented: 6th International Conference in the series Engineering The Surface, Edinburgh (GB), 23-25 September, 1997
Availability: Available from (1) as Paper EN 40969 ORA
Record Number: 199711555 / Last updated on: 1997-12-09
Original language: en
Available languages: en