Carbonate/hydroxide coprecipitation process

Details Carbonate/hydroxide coprecipitation process Carbonate/hydroxide coprecipitation process

1980-09-26

1983-02-08

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6256, 423419P, 423594, 264 65, C04B 3538

Patent

active

043728650

ABSTRACT:
The present invention improves the processing and products of coprecipitation of Fe and other metals selected from Mn, Zn, Ni, and Mg as carbonates and hydroxides in the manufacture of magnetically soft ferrites. Teachings are provided which enable control of the characteristics, especially the particle shape of coprecipitated metal carbonates and hydroxides, to bring about significant advantages in further processing such as relief of critical sintering requirements to meet commercial specifications, improved intermediate products which can be more easily handled during processing, and improved quality magnetically-soft, compacted, ferrite components.
In the manufacture of MnZn ferrites, sintering furnace temperatures encountered by components from the same batch can vary as much as 100.degree. C. while maintaining specifications of permeability and loss factor whereas, with prior ferrite materials, a variation of as little as 5.degree. C. to 10.degree. C. can make the difference between acceptable and non-acceptable product.

REFERENCES:
patent: 2903429 (1959-09-01), Guillaud
patent: 3027327 (1962-03-01), Blank
patent: 3542685 (1970-11-01), Iwase et al.
patent: 3652416 (1972-03-01), Sugano et al.
patent: 3725298 (1973-04-01), Woodhead et al.
patent: 3743707 (1973-07-01), Iwase et al.
patent: 3822210 (1974-07-01), Iwase et al.
patent: 4097392 (1978-06-01), Goldman et al.
patent: 4226843 (1980-10-01), Watanabe et al.

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