C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/4
C21D 8/12 (2006.01) G11B 5/706 (2006.01)
Patent
CA 1124620
COATING IRON OXIDE PARTICLES FOR Abstract of the Disclosure In the preparation of highly orientatable needle-shaped ferrimagnetic iron oxide particles by the reduction and reoxi- dation of needle-shaped particles of hydrated oxide of iron which have been surface treated against sintering the improvement which comprises effecting the surface treatment by applying to the particles of hydrated oxide of iron one layer of oxygen- containing anions and a further layer of polyvalent cations, each layer weighing about 0.02 to 2% by weight of the particle. Advantageously, the polyvalent cation-containing layer is applied between two oxygen-containing anion layers, the oxygen- containing anions used are selected from the group consisting of silicate, phosphate, borate, vanadate, molybdate and tungstate, the polyvalent cations used are selected from the group consisting of aluminum, chromium, manganese, iron and gallium, each layer weighs about 001 to 1% of the weight of the particles and before the reduction and reoxidation the surface treated particles of hydrated oxide of iron are tempered at a temperature of about 600 to 900°C. ******** Le A 17 757
325237
Buxbaum Gunter
Hahnkamm Volker
Hund Franz
Pflugmacher Ingo
Woditsch Peter
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
LandOfFree
Coating iron oxide particles for magnetic recording does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coating iron oxide particles for magnetic recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coating iron oxide particles for magnetic recording will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-731786