The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2008
Filed:
Dec. 20, 2005
Kenji Masada, Okayama, JP;
Hiroshi Kimura, Okayama, JP;
Takafumi Amino, Okayama, JP;
Dowa Mining Co., Ltd., Tokyo, JP;
Abstract
An iron nitride system magnetic powder comprising of particles comprised primarily of Fe16N(having an average particle diameter of up to 25 nm, for example) is provided, to which one or more elements selected from Si, P and Ti is adhered. The powder has a C/Fe atomic ratio of 0.5 to 30%, preferably a (Si+P+Ti)/Fe atomic ratio of 0.1 to 10%. With ΔHc defined (Hc·Hc)/Hc×100, the powder has a ΔHc of up to 5%, and with Δσs defined as (σs·σs)/σs×100, a Δσs of up to 20%. The powder can provide an ignition temperature of 140° C. or above, and a tap density of 1.0 g/cmor above. Hcand σsare the coercive force (kA/m) and saturation magnetization (Am/kg), respectively, of the iron nitride system magnetic powder after adhesion, and Hcand σsare the coercive force (kA/m) and saturation magnetization (Am/kg), respectively, of the powder after it has been stored in a thermo-hygrostat for one week at a temperature of 60° C. and a relative humidity of 90%.