Method for forming a drive hole in arc plasma spray fabricated f

Details Method for forming a drive hole in arc plasma spray fabricated f Method for forming a drive hole in arc plasma spray fabricated f

1978-06-15

1979-12-25

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29423, 29604, 264317, 427129, 427130, 427227, 427289, 427292, H01F 4102

Patent

active

041797957

ABSTRACT:
A method for forming a drive wire hole in a ferrite toroid phase shifter pted to operate in the millimeter frequency range. The ferrite toroid is fabricated by the arc plasma spray process. A slab of boron nitride is initially bonded to the dielectric insert of the ferrite toroid and the ferrite powder is arc plasma sprayed on the composite boron nitride-dielectric structure. The formed ferrite toroid is then annealed, and during the annealing process, the boron nitride slab is completely sublimated to form the required drive wire hole.

REFERENCES:
patent: 2988804 (1961-06-01), Tibbetts
patent: 3576672 (1971-04-01), Harris et al.
patent: 3747176 (1973-07-01), Toyoshima

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