| Microwave ferrites were prepared and the effect of aqueous and non-aqueous
media on milling, the influence of milling period pre-firing and sintering temperatures
on bulk density and oxygen content were studied. It has been found that oxygen content
is dependent on the bulk density of the ferrite, i.e. with increasing bulk density, oxygen
content decreases. Ferrites milled in non-aqueous media and pre-fired before final
sintering gave satisfactory results. The effect of quenching and slow linear cooling
on oxygen content was also studied. In the former process the ferrites are deficient
in oxygen, whereas the latter results in excess oxygen ferrites. |
