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发明授权
CN1792509B 保存稳定性出色的氮化铁系磁性粉末 失效 - 权利终止 转让

保存稳定性出色的氮化铁系磁性粉末
摘要：
本发明提供一种保存稳定性显著改善的氮化铁系磁性粉末。本发明的磁性粉末是在以Fe16N2为主体的氮化铁系磁性粉末(例如平均粒径在25nm或以下)的粒子表面包覆Si、P、Ti中的一种或多种的氮化铁系磁性粉末，其C/Fe的原子比为0.5-30％，优选的(Si+P+Ti)/Fe的原子比为0.1-10％。特别提供用ΔHc＝(HC0-HC1)/HC0×100所定义的ΔHc为5％或以下，用Δσs＝(σs0-σs1)/σs0×100所定义的Δσs为20％或以下的这样的氮化铁系磁性粉末，着火温度为140℃或更高，TAP密度为1.0g/cm3或更高的这样的氮化铁系磁性粉末是合适的对象。这里HC0和σs0分别为上述包覆后的矫顽力(kA/m)和饱和磁化强度(Am2/kg)，HC1和σs1分别为在恒温恒湿容器内在60℃、90％RH下保持一周后的矫顽力和饱和磁化强度。
摘要（英）：

The invention provides an iron nitride system magnetic powder with improved storing stability. The iron nitride system magnetic powder comprising of particles comprised primarily of Fe16N2 (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 DeltaHc defined (Hc0-Hc1)/Hc0*100, the powder has a DeltaHc of up to 5%, and with Deltasigmas defined as (sigmas0-sigmas1)/sigmas0*100, a Deltasigmas of up to 20%. The powder can provide an ignition temperature of 140 DEG C or above, and a tap density of 1.0 g/cm3 or above. Hc0 and sigmas0 are the coercive force (kA/m) and saturation magnetization (Am<2>/kg), respectively, of the iron nitride system magnetic powder after adhesion, and Hc1 and sigmas1 are the coercive force (kA/m) and saturation magnetization (Am<2>/kg), respectively, of the powder after it has been stored in a thermo-hygrostat for one week at a temperature of 60 DEG C and a relative humidity of 90%.

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