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    Process for producing phosphorous-bearing soft magnetic material
    41.
    发明授权
    Process for producing phosphorous-bearing soft magnetic material 失效
    生产含磷软磁材料的工艺

    公开(公告)号：US4152179A

    公开(公告)日：1979-05-01

    申请号：US810132

    申请日：1977-06-27

    申请人： Edward C. Falkowski ,  Carl E. Ruppel

    发明人： Edward C. Falkowski ,  Carl E. Ruppel

    IPC分类号： C22C33/02 ,  H01F1/22

    CPC分类号： C22C33/0214 ,  H01F1/22

    摘要： A method for producing a soft magnetic material consisting essentially of up to 0.05% carbon, up to 1.0% manganese, up to 0.5% sulfur, up to 0.5% silicon, from 0.5 to 1.5% phosphorus, balance iron and residuals. The method comprises the steps of: blending iron powder and phosphorus-bearing powder into a mixture containing from 0.5 to 1.5% phosphorus; pressing the blended mixture; and sintering the mixture in a non-oxidizing atmosphere at a temperature and for a period of time sufficient to produce a density of at least 7 grams per cubic centimeter. The sintering temperature is at least 2200.degree. F. The soft magnetic material is characterized by a magnetizing force to reach 10 kilogauss of no more than 2.0 oersteds, and a coercive force from 10 kilogauss of no more than 0.9 oersted.

    摘要翻译： 一种软磁材料的制造方法，其基本上由至多0.05％的碳，至多1.0％的锰，至多0.5％的硫，至多0.5％的硅，0.5至1.5％的磷，余量的铁和残余物组成。 该方法包括以下步骤：将铁粉和含磷粉末掺入含0.5-1.5％磷的混合物中; 压混合混合物; 并在非氧化性气氛中在足以产生至少7克/立方厘米的密度的温度和时间内烧结该混合物。 烧结温度至少为2200°F。软磁材料的特点是磁化力达到10千克，不超过2.0奥斯特，矫顽力为10千克，不超过0.9奥斯特。

    Method of making a magnetic powder
    43.
    发明授权
    Method of making a magnetic powder 失效
    制造磁粉的方法

    公开(公告)号：US3702270A

    公开(公告)日：1972-11-07

    申请号：US3702270D

    申请日：1971-06-21

    申请人： SONY CORP

    发明人： KAWASAKI MEIRO ,  HIGUCHI SHIGETAKA

    IPC分类号： G11B5/706 ,  B22F9/18 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  H01F1/04 ,  H01F1/06 ,  H01F1/22

    CPC分类号： H01F1/065 ,  B22F9/18 ,  H01F1/04

    摘要： A METHOD OF PREPARING POWDERS HAVING IMPROVED MAGNETIC PROPERTIES FOR USE IN THE MANUFACTURE OF RECORDING TAPES IS SHOWN. A COLLOIDAL SUSPENSION OF IRON OXIDE IS FORMED. A SOLUTION OF A SALT OF COBALT AND/OR NICKEL IS ADDED TO THE COLLOIDAL SUSPENSION AND THE MIXTURE IS AGITATED AND THE PH THEREOF CONTROLLED TO FACILITATE ABSORPTION OF THE COBALT AND/OR NICKEL SALTS ON THE IRON OXIDE. THE IRON OXIDE IS THEN REMOVED FROM SUSPENSION, WASHED, DRIED AND GROUND AND THEN DEHYDRATED TO UNIFORMLY DIFFUSE THE COBALT OR NICKEL INTO THE IRON OXIDE. THE MASS IS THEN REDUCED TO FORM THE METALLIC ALLOY. THE POWDERS FORMED ACCORDING TO THE INVENTION HAVE SUBSTANTIALLY INCREASED VALUES OF COERCIVE FORCE AND MAGNETIZATION AND ARE PARTICULARLY SUITED FOR USE IN MASTER VIDEO TAPES.