Process for stabilizing ferromagnetic chromium dioxide

Details Process for stabilizing ferromagnetic chromium dioxide Process for stabilizing ferromagnetic chromium dioxide

1981-11-05

1983-02-15

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6251, C01G 37027

Patent

active

043741185

ABSTRACT:
This invention relates to a process for stabilizing ferromagnetic chromium dioxide in respect of water and oxidizable organic compounds which it may contact in magnetic tapes. The process is applicable to a starting CrO.sub.2 having good magnetic properties, i.e. a coercive force not lower than about 400 Oersted, a maximum magnetic induction B.sub.m not lower than about 2500 gauss, and a magnetic induction B.sub.r not lower than about 1600 gauss. The CrO.sub.2 is subjected to a heat treatment at a temperature ranging from 300.degree. to 390.degree. C. in the presence of a gas stream not exerting any oxidizing or reducing action on the compounds of trivalent, tetravalent and hexavalent chromium. Suitable gases are, for example, nitrogen, helium and argon.

REFERENCES:
patent: 3512930 (1970-05-01), Bottjer et al.
patent: 3529930 (1970-09-01), Bottjer et al.
patent: 4126714 (1978-11-01), Haines

Affiliated with

Also associated with

Rating

Process for stabilizing ferromagnetic chromium dioxide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for stabilizing ferromagnetic chromium dioxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for stabilizing ferromagnetic chromium dioxide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1801205