Method for treating items from magnetically soft alloys

Details Method for treating items from magnetically soft alloys Method for treating items from magnetically soft alloys

1979-06-04

1980-07-15

Kendall, Ralph S.

Coating processes

Magnetic base or coating

427253, 148122, 428900, 4273741, C23C 902

Patent

active

042129044

ABSTRACT:
A method according to the present invention is intended for treating items (articles) for magnetically soft alloys employed in radio-electronic, relay and switching apparatus, in optical-and-mechanical and automation systems. The method consists in saturating the surface of items with chromium inside a powder chromizing mixture at a temperature in excess of 800.degree. C. The items are heated at a rate not higher than that of recrystallization of a metal of the items, and the rate of diffusion processes of saturating the items. The items are cooled at a rate close to that of phase transformations and formation of a magnetic structure in the metal of the items, for example, at the rate of 20-200 degree/hour below the Curie point. To enhance the magnetic properties and the stability thereof, as well as wearability and the resistance of the items to corrosion, chromizing of the item surfaces is conducted in an inert gas atmosphere.

REFERENCES:
patent: 4130847 (1978-12-01), Head et al.

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