Imphy S.a.

Michel Faral

Georges Couderchon

Lucien Coutu

Jacques Baudry

Jean-Francois Tiers

Shadow mask and process for manufacturing a shadow mask made of an iron/nickel alloy in which: a foil perforated with holes is provided, the foil is subjected to a heat treatment in order to obtain grains whose size, as defined by the ASTM standard, is greater than or equal to ASTM 7, the foil is formed in order to give it the shape of a shadow mask.

Process for manufacturing a shadow mask made of an iron/nickel alloy

Method for producing soft magnetic alloys with very high permeability, in which an ingot is cast containing in its composition more than 70% nickel or more than 45% cobalt, the metal having, or not having, been subjected to a secondary metallurgical step, the ingot is remelted under an electroconductive slag, the remelted ingots being converted into strips after hot rolling then cold rolling, the strips then being subjected to a treatment for developing magnetic characteristics, in which method the alloy is remelted under an electroconductive slag comprising at least the first three components of the system: CaF.sub.2, CaO, SiO.sub.2, Al.sub.2 O.sub.3, and defining a zone in a ternary diagram delimited by the following proportions by weight:

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Nevers, France

Michel Faral