Some features of the manufacture of R-100F-1 carbonyl iron powder
| Autor: | G. G. Alekseev, V. N. Prokhorov, V. G. Syrkin, I. S. Tolmasskii, A. I. Sazonov, T. A. Zavina, K. V. Korneva, Yu. G. Kir'yanov, O. R. Romanovskaya, N. I. Sokolov |
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| Rok vydání: | 1981 |
| Předmět: |
Materials science
Inorganic chemistry Metals and Alloys chemistry.chemical_element Condensed Matter Physics Decomposition Nitrogen Iron pentacarbonyl Ammonia chemistry.chemical_compound Carbonyl iron chemistry Mechanics of Materials Impurity Materials Chemistry Ceramics and Composites Carbon Temperature coefficient |
| Zdroj: | Soviet Powder Metallurgy and Metal Ceramics. 20:313-315 |
| ISSN: | 1573-9066 0038-5735 |
| DOI: | 10.1007/bf00791658 |
| Popis: | Raising the temperature in the reactor increases the concentrations of carbon and nitrogen impurities in a carbonyl iron powder, the increase in the nitrogen content being greater than that in the carbon content. A rise in reactor temperature increases both the goodness factor Qreland the temperature coefficient of magnetic permeability TCμ. Increasing the rate of feed of ammonia to the decomposition reactor brings about a growth in the concentration of nitrogen in a carbonyl iron powder, which lowers the TCμ of the powder and at the same time slightly decreases its goodness factor Qrel. The optimum conditions for the manufacture of a starting R-100 powder of lower TCμ. (not more than 80·10−6 1/deg C) are: upper, middle, and lower zone temperatures of 311, 306, and 337°C, respectively, an ammonia concentration in the decomposition products of 9 vol. %, and an iron pentacarbonyl feed rate of 32 liters/h. For the manufacture of R-100F-1 powder, the fine powder fractions from cyclones 2, 3, and 4 are used. The quantitative yield of carbonyl iron powder is 1.5–1.7%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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