公开(公告)号：US3227635A

公开(公告)日：1966-01-04

申请号：US16580662

申请日：1962-01-12

Applicant: IBM

Inventor： HERMAN KORETZKY ,  BERNARD LELAND ,  POLLEYS RHODES W

IPC: C25D7/00 ,  C25D7/06 ,  G11B5/73 ,  G11B5/858 ,  H01F10/10

CPC classification number: G11B5/7305 ,  C25D7/0614 ,  H01F10/10 ,  Y10S205/922

公开(公告)号：US3261771A

公开(公告)日：1966-07-19

申请号：US20638162

申请日：1962-06-29

Applicant: IBM

Inventor： POLLEYS RHODES W ,  JUDGE JOHN S

IPC: C25D7/06 ,  C25D17/10 ,  G11B5/64 ,  H01F41/26

CPC classification number: H01F41/26 ,  C25D7/0614 ,  C25D17/10 ,  G11B5/64 ,  Y10S205/922

公开(公告)号：US3859130A

公开(公告)日：1975-01-07

申请号：US31878472

申请日：1972-12-27

Applicant: IBM

Inventor： PARKER CHARLES C ,  POLLEYS RHODES W ,  VRANKA JOSEPH S

IPC: B22F9/24 ,  G11B5/706 ,  H01F1/06 ,  H01F10/02

CPC classification number: B22F9/24 ,  G11B5/70621 ,  H01F1/06 ,  Y10S428/90 ,  Y10T428/31786

Abstract: This invention relates to the preparation of magnetic recording media including finely divided magnetic particles. It especially relates to the preparation of high coercivity, finely divided magnetic alloy particles for use in recording media by reduction of salts of cobalt, and mixtures of salts of cobalt and iron, mixtures of salts of cobalt and nickel, in a bath containing hypophosphite and amine borane anion reducing agents. Sodium hypophosphite and dimethyl amine borane or any soluble salts which provide hypophosphite and amine borane anions in solution are reacted with soluble metal salts of cobalt alone, or cobalt with iron, or nickel dissolved in the bath. After separating and drying, the precipitate is found to consist of non-pyrophoric magnetic alloy particles, including about 0.1-5% phosphorus and about 0.1-1.5% boron, which are generally spherical in shape and which vary in size from about 0.01 micron to 3.0 microns in diameter. These particles are dispersed in a binder, the dispersion coated on a substrate, and dried to form a recording media.

Abstract translation: 本发明涉及包括细碎磁性颗粒的磁记录介质的制备。 它特别涉及制备高矫顽力的精细分散的磁性合金颗粒，用于通过还原钴的盐，钴和铁的盐的混合物，钴和镍的混合物在含有次磷酸盐的浴中的记录介质中，以及 胺硼烷阴离子还原剂。 次磷酸钠和二甲胺硼烷或在溶液中提供次磷酸盐和胺硼烷阴离子的任何可溶性盐与单独的钴的可溶性金属盐或溶解在浴中的铁或镍的钴反应。 分离和干燥后，发现沉淀物由非发火磁性合金颗粒组成，包括约0.1-5％的磷和约0.1-1.5％的硼，其通常为球形，并且尺寸从约0.01微米变化到 直径为3.0微米。 将这些颗粒分散在粘合剂中，将分散体涂布在基材上，并干燥以形成记录介质。