Synthetically obtained ilmenite (FeO·TiO₂) particles were oxidized under conditions of a non-linear temperature increase over the range 300°-850°C. Short-circuit diffusion in the initial stages of oxidation gave an activation energy of 4.35 ± 0.4 kcal/mole, while above 525°C the activation energy was 50.2 ± 3.0 kcal/mole. The process was shown to be diffusion controlled, with iron the likely mobile species above 525°C, while no mechanism could be singled out for the controlling step in the early stages.
The oxidation products in O₂ after 24 hours were shown to be pseudorutile (Fe₂Ti₃O₉) and hematite (Fe₂O₃) in a finely dispersed phase at temperatures below about 800°C, with pseudobrookite (Fe₂TiO₅) and rutile (TiO₂) being stable above this temperature. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/51887 |
| Date | January 1977 |
| Creators | Corsa, Lawrence J. |
| Contributors | Materials Engineering |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | en_US |
| Detected Language | English |
| Type | Thesis, Text |
| Format | 71 leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 8145757 |
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