Rare-earth containing iron-base resin bonded magnets

A rare-earth containing iron-base resin-bonded magnet consisting essentially of:

• an iron-base magnetic powder that contains a rare earth metal selected from the group consisting of neodymium and praseodymium;
• a filler powder;
• a resin including one of thermoplastic resin and thermosetting resin;
• and
• an additive,
• wherein the filler powder contains at least one element selected from the group consisting of tungsten, nickel, cobalt, copper, iron, chromium, silicon, carbon manganese, molybdenum, titanium, zinc, lead, tin, and aluminum.

A method for manufacturing a rare-earth containing iron-base resin-bonded magnet, comprising the steps of:

• mixing an iron-base magnetic powder that contains a rare earth metal selected from the group consisting of neodymium and praseodymium with one of thermoplastic resin and thermosetting resin, and an additive;
• mixing a filler powder with a resin including one of thermoplastic resin and thermosetting resin and an additive;
• and
• forming a predetermine shape by molding,
• wherein the filler powder contains at least one element selected from the group consisting of tungsten, nickel, cobalt, copper, iron, chromium, silicon, carbon manganese, molybdenum, titanium, zinc, lead, tin, and aluminum.

A rare earth-iron resin-bonded magnet comprising:

• magnetic powder of the iron family containing rare earths;
• tungsten alloy filler powder having a specific gravity greater than that of the magnetic powder of the ion family;
• thermosetting resin;
• and
• an additive,
• wherein the rare earth-iron resin-bonded magnet is formed by compression-molding the mixture.

A bonded magnet comprising:

• a synthetic resin binder;
• a magnetic powder containing rare earth metal, iron and boron;
• and
• a mixture of Ni-W alloy mixed powder with at least one element selected from among Cr, Mo, Zn and Al.

A corrosion resistant bonded magnet comprising:

• a synthetic resin binder;
• a magnetic powder containing rare earth metal, iron and boron;
• and
• a mixture of Ni-W alloy mixed powder with an additive consisting one element selected from the group consisting of Cr, Mn, Zn, and Al,
• whereby an electrode potential difference between the magnetic powder and the mixture of Ni-W with the additive is reduced.