Temperature and oxidation resistance of the ODS materials MA 956 and PM 2000
| Autor: | H.-J. Klam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1993 |
| Předmět: |
Materials science
Kirkendall effect 020209 energy Metallurgy Iron oxide Oxide General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Carbide chemistry.chemical_compound Chromium chemistry Aluminium [PHYS.HIST]Physics [physics]/Physics archives 0202 electrical engineering electronic engineering information engineering 0210 nano-technology Internal oxidation Porosity |
| Zdroj: | Journal de Physique IV Proceedings Journal de Physique IV Proceedings, EDP Sciences, 1993, 03 (C7), pp.C7-731-C7-734. ⟨10.1051/jp4:19937115⟩ |
| ISSN: | 1155-4339 1764-7177 |
| DOI: | 10.1051/jp4:19937115⟩ |
| Popis: | The objective of the present paper was to show the various macro-/microstructural appearances of the ODS materials MA 956 and PM 2000 at the surface and in the bulk after exposure to high temperatures in combustion chambers (gaseous environment). At the surface a chromium oxide layer forms above the alumina layer originally formed after preoxidation. At locations where the surface has been melted these two oxide layers disappear and an iron oxide showing cracks forms at the surface. Several cracks run into the material. In the bulk material due to high thermal gradients a porosity of up to 18 % in MA 956 and 2% in PM 2000 develops during operation (Kirkendall effect). With longer operation times, at higher temperatures and probably in other environments (chemical cracking of the fuel) internal oxidation or nidriding of aluminium and/or formation of chromium carbides take place. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|