| Autor: |
Myalkovskii, V. V., Zhelibo, E. P. |
| Zdroj: |
Powder Metallurgy and Metal Ceramics; September 1981, Vol. 20 Issue: 9 p595-598, 4p |
| Abstrakt: |
Changing the Fe2+:Co2+ ratio in the electrolyte strongly affects the composition of the alloy but not its current efficiency; the current efficiency falls only at iron-to-cobalt ratios in excess of 1:1. At a high cobalt ion concentration in the electrolyte both the current efficiency and the cobalt content of the alloy cease to vary proportionally to the ion concentration. An x-ray diffraction investigation has established that increasing the cobalt ion concentration in the electrolyte decreases the size of iron-cobalt alloy blocks, which manifests itself in the ratio range Fe2+:Co2+=0.6. When this ratio is exceeded, the a-phase of the iron-cobalt alloy becomes amorphous, but on the whole the particles of the deposit retain a crystalline structure owing to the presence of an independent crystalline cobalt phase. At high cobalt ion concentrations in the electrolyte the particles forming by electrolysis constitute a pseudoalloy consisting of the a-phase of the cobalt alloy and the a and ß-modifications of metallic cobalt. Lowering the Fe2+: Co2+ ratio brings about a steady decrease in the crystal lattice constant. Magnetic measurements have revealed the existence of maximum values of coercive force and magnetic induction in a range of Fe2+: Co2+ ratios close to unity. |
| Databáze: |
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