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Method for Producing Non Magneto Strictive Magnetic Electro Deposition and Deposits Obtained with such Methods

IP.com Disclosure Number: IPCOM000095826D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Delclos, Y: AUTHOR [+3]

Abstract

In this process of electrolytic deposition, magnetic deposits showing no magnetrostriction are realized.

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Method for Producing Non Magneto Strictive Magnetic Electro Deposition and Deposits Obtained with such Methods

In this process of electrolytic deposition, magnetic deposits showing no magnetrostriction are realized.

When a nickel-iron alloy material is placed in the influence of a magnetic field, it undergoes a change of dimensions. The extent depends on the induction in the magnetic material and on the composition of the alloy. This magnetostrictive effect can be characterized, in the case of a magnetic bar, by the relationship between the relative variation of the length of the bar and the value of the field or magnetic induction which gives rise to it. When this relation is positive (Ni content less than 81%), the magnetostriction is called positive. In the opposite case (Ni content greater than 81%), it is negative. Thus, it is desirable to have an electrolytic coating process which maintains a stabilization of the Fe/Ni + Fe coating ratio as close as possible to the known ratio 19/100, which gives zero magnetostriction.

The realization of such a non-magneto-strictive composition (81% Ni, 19% Fe) by electrolytic deposition requires extremely delicate deposition conditions. The parameters which have to be closely controlled are: 1. The nickel and iron content of the electrolytic bath (and also the agitation of the bath) 2. The temperature of the electrolytic bath 3. The diameter of the wire used 4. The deposition voltage.

This process, which renders these depo...