High-weatherability iron nitride-based magnetic powder and...

Details High-weatherability iron nitride-based magnetic powder and... High-weatherability iron nitride-based magnetic powder and...

2005-07-29

2008-05-13

Le, H. T (Department: 1794)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C427S215000, C427S216000, C427S372200, C428S404000

Reexamination Certificate

active

07371458

ABSTRACT:
A high-reliability iron nitride-based magnetic powder with markedly improved weatherability with respect to deterioration over time of the magnetic properties in fine particles smaller than 25 nm is formed by adhering one or more of the elements Si and P to the surface of an iron nitride-based magnetic powder constituted primarily of Fe16N2with an average grain size of 25 nm or less, where the total content of Si and P in the magnetic powder may be 0.1% or greater as an atomic ratio with respect to Fe. In particular, the invention provides an iron nitride-based magnetic powder such that the value ΔHcas defined by Equation (1) below is 5% or less and the value Δσsas defined by Equation (2) below is 20% or less.in-line-formulae description="In-line Formulae" end="lead"?ΔHc=(Hc0−Hc1)/Hc0100  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Δσs=(σs0−σs1)/σs0100  (2)in-line-formulae description="In-line Formulae" end="tail"?Here, Hc1and σs1are the coercivity and saturation magnetization, respectively, of the magnetic powder after being kept for one week at a constant temperature and constant humidity of 60° C. and 90% RH. Hc0and σs0are the coercivity and saturation magnetization of the magnetic powder before being kept at constant temperature and constant humidity.

REFERENCES:
patent: 5605752 (1997-02-01), Matsubayashi
patent: 6964811 (2005-11-01), Kishimoto et al.
patent: 2000-277311 (2000-10-01), None
patent: 03/079333 (2003-09-01), None

Affiliated with

Also associated with

Rating

High-weatherability iron nitride-based magnetic powder and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High-weatherability iron nitride-based magnetic powder and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-weatherability iron nitride-based magnetic powder and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3982413