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Oxide Slag Elimination

IP.com Disclosure Number: IPCOM000098006D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bertelsen, BI: AUTHOR [+2]

Abstract

In vacuum deposition of metals, it is desirable to maintain an evaporation surface area of the molten source as free from oxide slag as possible. Melts having complete or partial covering of slag are not well suited for vaporization processes, since variable and reduced evaporation rates result.

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Oxide Slag Elimination

In vacuum deposition of metals, it is desirable to maintain an evaporation surface area of the molten source as free from oxide slag as possible. Melts having complete or partial covering of slag are not well suited for vaporization processes, since variable and reduced evaporation rates result.

Oxide slag is eliminated by adding a reducing metal to the molten sources. In thin Ni-Fe film deposition, the adding of small amounts of molybdenum, or similar reducing metals, to the molten source of Ni-Fe may cause undesired changes of the magnetic properties of the deposited ferromagnetic layer. Such undesired effect does not take place when rare earth metals, such as Gadolinium, are used as reducing metals. The additive rare earth metal reacts with the principle constituents of the slag to form more volatile products. This method of oxide slag elimination is useful, although the additive itself may have higher vapor pressure than the desired coating alloy at the respective evaporation temperature.

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