Oxidation of iron powders
| Autor: | G. I. Aksenov, Yu. P. Orekhov, V. K. Boikov |
|---|---|
| Rok vydání: | 1974 |
| Předmět: |
Materials science
Metals and Alloys Analytical chemistry Relative weight engineering.material Condensed Matter Physics Iron powder Atmosphere chemistry.chemical_compound Crystallography chemistry Mechanics of Materials Oxidizing agent Materials Chemistry Ceramics and Composites engineering Wüstite Particle size Water vapor Magnetite |
| Zdroj: | Soviet Powder Metallurgy and Metal Ceramics. 13:185-188 |
| ISSN: | 0038-5735 |
| DOI: | 10.1007/bf00790631 |
| Popis: | 1. It is shown that with rise in temperature and increase in exposure time, water vapor concentration in the atmosphere, and particle size the rate of oxidation of an iron powder grows. On the basis of experimental data, formulas have been derived enabling the relative weight gain of a powder and the thickness of magnetite films on its particles to be determined as functions of the above factors. 2. Comparison of weight gains due to oxidation in water vapor, calculated with the familiar formula for bulk iron, and weight gains determined experimentally for an iron powder indicates that the formula does not express the oxidation characteristics of a powder. Good agreement with experimental values is given by weight gains obtained with a formula taking into account also the powder particle size and the amount of oxidizing components in the atmosphere. 3. Results of x-ray structural analysis have shown that the oxidation of an iron powder results in the formation of magnetite at temperatures of 350 and 450‡C and of wustite and magnetite at 550‡C. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|