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    Process for preparing active oxide powders
    1.
    发明授权
    Process for preparing active oxide powders 失效
    制备活性氧化物粉末的方法

    公开(公告)号：US4140771A

    公开(公告)日：1979-02-20

    申请号：US880921

    申请日：1978-02-24

    申请人： Michael F. Berard ,  Orville Hunter, Jr. ,  Loren E. Shiers ,  Stephen L. Dole ,  Ralph W. Scheidecker

    发明人： Michael F. Berard ,  Orville Hunter, Jr. ,  Loren E. Shiers ,  Stephen L. Dole ,  Ralph W. Scheidecker

    IPC分类号： B01J13/00 ,  C01F5/02 ,  C01F17/00 ,  C01G25/02

    CPC分类号： C01G25/02 ,  B01J13/0069 ,  C01F17/0043 ,  C01F5/02 ,  C01P2006/10

    摘要： An improved process for preparing active oxide powders in which cation hydroxide gels, prepared in the conventional manner are chemically dried by alternately washing the gels with a liquid organic compound having polar characteristics and a liquid organic compound having nonpolar characteristics until the mechanical water is removed from the gel. The water-free cation hydroxide is then contacted with a final liquid organic wash to remove the previous organic wash and speed drying. The dried hydroxide treated in the conventional manner will form a highly sinterable active oxide powder.

    摘要翻译： 制备活性氧化物粉末的改进方法，其中以常规方式制备的阳离子氢氧化物凝胶通过用具有极性特征的液体有机化合物交替洗涤凝胶而化学干燥，并且具有非极性特性的液体有机化合物直到机械水从 凝胶。 然后将无水阳离子氢氧化物与最终的液体有机洗涤液接触以除去先前的有机洗涤和速度干燥。 以常规方式处理的干燥氢氧化物将形成高度可烧结的活性氧化物粉末。

    Process of hot isostatic pressing of ferrite material
    3.
    发明授权
    Process of hot isostatic pressing of ferrite material 失效
    铁氧体材料的热等静压加工工艺

    公开(公告)号：US4552710A

    公开(公告)日：1985-11-12

    申请号：US567883

    申请日：1984-01-03

    申请人： Eugene B. Rigby ,  Ralph W. Scheidecker ,  Robert R. Suchomel

    发明人： Eugene B. Rigby ,  Ralph W. Scheidecker ,  Robert R. Suchomel

    IPC分类号： C04B35/26 ,  C04B35/638 ,  C04B35/64 ,  C04B35/645

    CPC分类号： C04B35/26 ,  C04B35/6455

    摘要： Process of hot isostatic pressing of MnZn ferrite material for producing ferrite close to theoretical density without a significant increase in grain size. Permeability is increased with the increase in theoretical density. The process includes the steps of pressurizing an entire ferrite sample which is surrounded by pieces of similar composition while in alumina crucibles with fused alumina grain there between and an optional oxygen getter on top of the grain, introducing an inert atmosphere, elevating pressure and temperature, the temperature elevated to a value below that previously used for sintering or hot pressing, and maintaining temperature to optimize density without excess grain growth. Density is thereby optimized without excess grain growth, while maintaining or improving the magnetic properties.

    摘要翻译： 用于生产铁素体的MnZn铁氧体材料的热等静压过程接近于理论密度，晶粒尺寸没有明显的增加。 渗透率随着理论密度的增加而增加。 该方法包括以下步骤：将由相似组成的块围绕的整个铁氧体样品加压，同时在其间具有熔融氧化铝颗粒的氧化铝坩埚中和在颗粒顶部的任选的氧气吸气剂之间，引入惰性气氛，升高压力和温度， 温度升高到低于先前用于烧结或热压的值，并保持温度以优化密度而没有过多的晶粒生长。 从而优化密度，而不会过多的晶粒生长，同时保持或改善磁性能。

    Process for controlling ferrous iron content in manganese zinc ferrite
    4.
    发明授权
    Process for controlling ferrous iron content in manganese zinc ferrite 失效
    锰锌铁氧体中亚铁含量的控制方法

    公开(公告)号：US4892672A

    公开(公告)日：1990-01-09

    申请号：US761534

    申请日：1985-08-01

    申请人： Ralph W. Scheidecker ,  Robert R. Suchomel

    发明人： Ralph W. Scheidecker ,  Robert R. Suchomel

    IPC分类号： C01G49/00 ,  C04B35/26

    CPC分类号： C04B35/2658 ,  C01G49/009 ,  C01P2002/32 ,  Y10S423/15

    摘要： Process of calcining the ball milling manganese zinc MnZn, ferrite material for achieving a ferrite having a ferrous iron content appropriate for optimum magnetic properties. A first initial ball milling step is very carefully controlled as a small amount of metallic iron is blended into an initial mixture which is a catalyst for the ferrous iron reduction reaction during a calcine step. This provides for a predetermined ferrous iron content to be set in the powder prior to any forming or firing steps. The process includes a controlled atmosphere, time, and temperature for the calcining process step, and a second controlled ball milling step over time where the interaction of the stainless steel balls and milled slurry contributes to final ferrous iron content. These two process steps are balanced yielding a MnZn ferrite powder of a predetermined particle size with a controlled ferrous iron content which is a function of both the calcining and ball milling steps.

    摘要翻译： 煅烧球磨锰锌MnZn的方法，铁氧体材料，用于实现具有适合于最佳磁性的亚铁含量的铁氧体。 第一初始球磨步骤非常仔细地被控制，因为少量的金属铁被掺入到初始混合物中，初始混合物是煅烧步骤期间用于二氧化碳还原反应的催化剂。 这提供了在任何成形或烧制步骤之前在粉末中设置预定的亚铁含量。 该方法包括煅烧工艺步骤的受控气氛，时间和温度，以及随着时间的推移，第二受控球磨步骤，其中不锈钢球和研磨的浆料的相互作用有助于最终的亚铁含量。 这两个工艺步骤是平衡的，产生具有受控亚铁含量的预定粒度的MnZn铁氧体粉末，其是煅烧和球磨步骤的函数。