Abstract
Effects of small amount of various oxides on the magnetostrictive properties of magnetite were studied with a view of enhancement of the magnetic properties of materials. The specimens were sintered at temp-eratures from 1150 to 1200°C in the atmosphere of CO2 gas by the conventional powder metallurgical technics. It has been clarified that the substitution of cobaltous ions for ferrous ions leads to an enhan-cement of magnetostrictive properties (the increase of the saturation magnetostriction), and the addition of a small amount of TiO2 results in the increase of the resistivity and also the reduction of the eddy current loss. Furthermore, it has been confirmed that the addition of Si02 results in the formation of homogeneous specimens with high density, fine grain size and favourable mechanical strength.
A procedure for preparing the magnetostrictive vibrator of good performance is given after considering the effect of additives on the properties of magnetite.
