Temperature stable ferrite FM tuning core

Details Temperature stable ferrite FM tuning core Temperature stable ferrite FM tuning core

1974-05-08

1976-04-06

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

252 6262, 264104, C04B 3526

Patent

active

039490327

ABSTRACT:
A ferrite FM tuning core and a method of producing it. The ferrite tuning core is physically and electrically interchangeable with a powdered iron FM tuning core but exhibits a substantially lower temperature coefficient of permeability. The tuning core is a nickel-zinc ferrite containing, in mol percent, 65-70% ferric oxide, 25-30% nickel oxide, and 4.5-5.5% zinc oxide. In the method, the oxides forming the ferrite are pressed into a solid cylindrical body, and the body is heated at a rate of about 5.degree.-15.degree.F per minute to a maximum temperature of about 2000.degree.-2100.degree.F. Upon reaching the maximum temperature the ferrite body is immediately allowed to cool at a rate of about 1.5.degree.-2.0.degree.F per minute to a temperature below about 400.degree.F.

REFERENCES:
patent: 3036009 (1962-05-01), Zerbes

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