JPS54128498A - Treating method for cobalt-containing iron oxide magnetic powder - Google Patents

Treating method for cobalt-containing iron oxide magnetic powder

Info

Publication number
JPS54128498A
JPS54128498A JP3738178A JP3738178A JPS54128498A JP S54128498 A JPS54128498 A JP S54128498A JP 3738178 A JP3738178 A JP 3738178A JP 3738178 A JP3738178 A JP 3738178A JP S54128498 A JPS54128498 A JP S54128498A
Authority
JP
Japan
Prior art keywords
iron oxide
magnetic powder
oxide magnetic
powder
ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3738178A
Other languages
Japanese (ja)
Inventor
Mikio Kishimoto
Junichi Hirata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP3738178A priority Critical patent/JPS54128498A/en
Publication of JPS54128498A publication Critical patent/JPS54128498A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enhance the transfer characteristics of a magnetic recording medium as a recording element by oxidizing iron oxide magnetic powder conts. Co dissolved in the particles until the Fe2+ content reaches a specific value, followed by heat treatment at a low temp.
CONSTITUTION: Co-dissolved iron oxide magnetic powder having the ratio of Fe2+/total Fe 0.06W0.15 is oxidized in an oxidizing atmosphere usually at about 150W300°C to regulate the ratio to around 0.06. The powder is then heat treated at below 80, pref. 50W70°C to enhance the treansfer characteristics. The heat treatment time is above 3000 hr at 50°C, above 300 hr at 70°C and above 100 hr at 80°C. The powder may be heat treated directly in an oxidizing atmosphere at below 80°C until the ratio lowers to below 0.06 while being oxidized.
COPYRIGHT: (C)1979,JPO&Japio
JP3738178A 1978-03-29 1978-03-29 Treating method for cobalt-containing iron oxide magnetic powder Pending JPS54128498A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3738178A JPS54128498A (en) 1978-03-29 1978-03-29 Treating method for cobalt-containing iron oxide magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3738178A JPS54128498A (en) 1978-03-29 1978-03-29 Treating method for cobalt-containing iron oxide magnetic powder

Publications (1)

Publication Number Publication Date
JPS54128498A true JPS54128498A (en) 1979-10-05

Family

ID=12495937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3738178A Pending JPS54128498A (en) 1978-03-29 1978-03-29 Treating method for cobalt-containing iron oxide magnetic powder

Country Status (1)

Country Link
JP (1) JPS54128498A (en)

Similar Documents

Publication Publication Date Title
JPS5217696A (en) Manufacturing process of ferromagnetic grit
JPS54160514A (en) Decarburization and annealing method for directional electromagnetic steel plate
JPS54128498A (en) Treating method for cobalt-containing iron oxide magnetic powder
JPS54128497A (en) Treating method for cobalt-containing iron oxide magnetic powder
JPS54128499A (en) Treatimg method for cobalt-containing iron oxide magnetic powder
JPS5521146A (en) Manufacturing method of magnetic powder
JPS5240304A (en) Manufacturing method of magnetic recording medium
JPS54128500A (en) Treating method for coblat-containing iron oxide magnetic powder
JPS5789401A (en) Preparation of acicular magnetic metallic particle
JPS5630707A (en) Manufacture of ferromagnetic metal powder, ferromagnetic metal powder and magnetic recording medium
JPS56114833A (en) Production of fine particle of iron compound for magnetic recording
JPS5275700A (en) Production of magnetic iron oxide powder including co
JPS5562105A (en) Production of magnetic alloy powder
JPS54124297A (en) Ferromagnetic powder
JPS5573803A (en) Production of magnetic alloy powder
JPS53115697A (en) Method for producing ferromagnetic iron oxide powder
JPS55167139A (en) Manufacture of oxide magnetic thin film
JPS5384196A (en) Manufacturing method of magnetic iron oxide
JPS5613409A (en) Manufacture of ferromagnetic alloy powder
JPS57205325A (en) Manufacture of gamma type ferric oxide
JPS5583207A (en) Preparation of ferromagnetic powder
JPS5519890A (en) Method of manufacturing fe-cr-co magnetic material
JPS5567335A (en) Regeneration of oxidizing catalyst
JPS5684404A (en) Manufacture of magnetic alloy powder composed primarily of iron or metallic iron magnetic powder
JPS5763606A (en) Manufacture of magnetic powder