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公开(公告)号：EP0343934A3
公开(公告)日：1990-11-22
申请号：EP89305215.9
申请日：1989-05-23
CPC分类号： G01N33/5434 , B03C1/01 , G01N2446/20 , G01N2446/80 , H01F1/36 , H01F1/445 , Y10T428/2989
摘要： Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e.g. by ammonia or an amine, recovered, and heated at 250 - 2000 o C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.
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公开(公告)号：EP0343934B1
公开(公告)日：1995-01-25
申请号：EP89305215.9
申请日：1989-05-23
CPC分类号： G01N33/5434 , B03C1/01 , G01N2446/20 , G01N2446/80 , H01F1/36 , H01F1/445 , Y10T428/2989
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3.发明公开Magnetically attractable particles and method of preparation 失效Magnetisch anziehbare Teilchen und Herstellungsverfahren。
公开(公告)号：EP0343934A2
公开(公告)日：1989-11-29
申请号：EP89305215.9
申请日：1989-05-23
CPC分类号： G01N33/5434 , B03C1/01 , G01N2446/20 , G01N2446/80 , H01F1/36 , H01F1/445 , Y10T428/2989
摘要： Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e.g. by ammonia or an amine, recovered, and heated at 250 - 2000 o C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.
摘要翻译： 磁性可吸引颗粒包含一个包裹在金属氧化物涂层中的磁性材料芯。 它们可以通过将惰性水不混溶液体中的磁性材料或前体的水溶液或分散体以及涂层无机氧化物或前体的水溶液或溶胶乳化来制备。 水滴被凝胶化，例如 通过氨或胺，回收并在250-2000℃下加热。 所得颗粒通常为直径小于100微米且通常为亚微米尺寸的平滑球体。
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