Injection molded dielectromagnets prepared from mixture or hard magnetic powders

Dielectromagnets are permanent magnets prepared from a hard magnetic powder bonded by binder. These permanent magnets are termed also as bonded permanent magnets. There are two ways to prepare dielectromagnets: compression molding and injection molding. Dielectromagnets prepared by injection molding, from the same hard magnetic powders, have worse magnetic properties than dielectromagnets prepared by compression molding, but they are cheaper. Isotropic dielectromagnets prepared from ferrite powder have low value of magnetic prperties, but thier advantage is positive value of temperature coefficient of jHc. They are low in price. Dielectromagnets prepared from melt-spun ribbon Nd-Fe-B have high value of magnetic properties. Value of temperature coefficient of jHc is thier weakness. They are more expensive than ferrite dielectromagnets. Comparison of advantages and disadvantages of dielectromagnets prepared from different kinds of hard magnetic powder has produced an idea of making dielectromagnets from the mixture of ferrite and melt-spun ribbon N-Fe-B powders. Dielectromagnets prepared from the mixture of of these powders prepared by compression molding have magnetic and thermal properties of values between values of dielectromagnets from Nd- Fe- B and ferrite powders. It was described elsewhere. The purpose of this investigation is to prepare injection molded dielectromagnets from moxture of powders of strontium ferrite and melt-spun ribbon Nd-Fe-B and find correlation between the composition of mixture and magnetic properties of dielectromagnets. A result of mixture composition on magnetic properties of injection molded dielectromagnets is shown.