Rare earth magnet, method for producing same and method for producing multilayer body
View Patent ↗The present invention aims to provide a rare earth magnet having sufficiently excellent anticorrosion property. The rare earth magnet 1 according to the present invention to solve the above problems includes a magnet body 10 containing rare earth elements, a substantial amorphous layer 20 formed on a surface of the magnet body 10 , and a protecting layer 30 on a surface of the amorphous layer 20 , and the amorphous layer 20 contains material identical to main component elements of magnet material contained in the magnet body 10.
1. A rare earth magnet comprising:
a magnet body containing a rare earth element;
an amorphous layer formed on a surface of the magnet body and containing amorphous substance; and
a protecting layer formed on a surface of the amorphous layer, wherein
the magnet body is polycrystalline and contains polycrystal substance,
a boundary between the magnet body and the amorphous layer includes a region where the polycrystal substance of the magnet body and the amorphous substance of the amorphous layer are mixed,
the amorphous layer has a film thickness from 0.3 to 10 μm,
the protecting layer consists of aluminum,
the amorphous layer is amorphized from a surface of the magnet body and contains an element identical to a main component element of a magnet material contained in the magnet body,
a roughness Ra of a boundary between the magnet body and the amorphous layer ranges from 1.27 to 1.45 μm,
a roughness Ra of a boundary between the amorphous layer and the protecting layer ranges from 0.68 to 0.85 μm, and
a coefficient of thermal expansion of the magnet body is substantially similar to a coefficient of thermal expansion of the amorphous layer.