Bonded magnet and process for its manufacture
AssigneeTDK Corporation
InventorMutsuko Nakano
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Abstract
The invention provides a bonded magnet having more excellent rust inhibiting performance than the prior art, and a process for its manufacture. The bonded magnet manufacturing process of the invention is a process for manufacture of a bonded magnet wherein a protective layer is formed on the surface of a bonded magnet body containing a rare earth element, the process comprising a step of contacting the bonded magnet body with a solution containing a phosphate and an acid ion to form a phosphorus-containing protective layer on the surface of the bonded magnet body.
Claims5
A process for manufacture of a bonded magnet wherein a protective layer is formed on a surface of a bonded magnet body containing a rare earth element comprising:
- a step of contacting said bonded magnet body with a solution containing a phosphate and an acid ion to form a phosphorous-containing protective layer on the surface of said bonded magnet body.
A bonded magnet comprising a bonded magnet body containing a rare earth element and a protective layer containing Zn and P formed on a surface of the magnet body,
- wherein the ratio MZn/MP of the Zn mass MZn and P mass MP in the protective layer satisfies the conditions represented by the following inequality (1).
- 2.4≦MZn/MP≦7.8 (1)
Dependencies are inferred from the claim text.