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    • 87. 发明专利
    • Manufacture of magnetic powder
    • 磁粉制造
    • JPS59198702A
    • 1984-11-10
    • JP7206183
    • 1983-04-26
    • Ube Ind Ltd
    • OODAN KIYOUJIMIURA HIROSHIISHICHI KOUJI
    • G11B5/712B22F1/00B22F9/22C01G49/02C09D5/23C09D7/12G11B5/706H01F1/032
    • G11B5/70689
    • PURPOSE:To check effectively getting out of shape of parent material powder and sintering between particles according to heat treatment, and to obtain uniformly needle-like magnetic powder having favorable dispersibility by a method wherein phosphate in gaseous condition is made to come in contact with the parent material powder. CONSTITUTION:When needle-like magnetic powder is to be manufactured using needle-like oxy iron hydroxide powder or needle-like iron oxide powder as a parent material, the parent material is made to come in contact previously with phosphate in gaseous condition, and needle-like oxy iron hydroxide (goethite) powder is filled up in a quartz tube provided with a glass filter at the bottom. Then air is circulated at the room temperature in trimethyl phosphate, air containing 1vol% of trimethyl phosphate is flowed in the quartz tube using air as a carrier, and the trimethyl phosphate is made to come in contact with the goethite powder at the room temperature for 10min fluidizing the goethite powder. Then after the powder thereof is heated to be dehydrated for 1hr at 600 deg.C in an air atmosphere, it is reduced in a hydrogen atmosphere for 1hr at 320 deg.C, and then oxidized for 1hr at 250 deg.C in an air atmosphere to obtain needle-like magnetic powder of magnesite.
    • 目的:为了有效地检查母材粉末的形状和根据热处理的颗粒之间的烧结,并且通过使气态磷酸盐与其接触的方法获得均匀的具有良好分散性的针状磁性粉末 母料粉。 构成:使用针状氧化铁氢氧化物粉末或针状氧化铁粉末作为母体制造针状磁性粉末时,使母体与气态条件下的磷酸盐接触,并且针 将氧化氢氧化铁(针铁矿)粉末填充在底部设有玻璃过滤器的石英管中。 然后将空气在室温下在磷酸三甲酯中循环,使用空气作为载体,将含有1体积%磷酸三甲酯的空气在石英管中流动,并使磷酸三甲酯与室温下与针铁矿粉接触 10min流出针铁矿粉。 然后将其粉末在空气气氛中在600℃加热脱水1小时后,在氢气气氛中在320℃下还原1小时,然后在空气中在250℃下氧化1小时 气氛中获得菱镁矿针状磁粉。