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Method of Making Coating of Pure Metal

IP.com Disclosure Number: IPCOM000098745D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Russell, LK: AUTHOR

Abstract

This is a method of further purifying an already pure elemental solid or alloy. The starting material E is placed in the crucible C and is vaporized by induction heating caused by an r-f current flowing in the coils A. It is possible, by controlling the pressure in the sealed tube and the temperature, to selectively vaporize the starting material so as to boil off particular atoms of the desired substance.

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Method of Making Coating of Pure Metal

This is a method of further purifying an already pure elemental solid or alloy. The starting material E is placed in the crucible C and is vaporized by induction heating caused by an r-f current flowing in the coils A. It is possible, by controlling the pressure in the sealed tube and the temperature, to selectively vaporize the starting material so as to boil off particular atoms of the desired substance.

An electron gun F causes a stream of electrons to pass perpendicular to the path of the emitted atoms, and, if the accelerating potential of the gun F is greater than the ionization potential of the desired substance, a large proportion of the substance atoms are ionized. Here again, further purification is possible. By proper adjustment of the accelerating potential a high degree of selective ionization of either the desired or of the undesired atoms is possible.

The ionized atoms are accelerated by the ring electrode J, and bent, according to their mass, out of the main stream of the magnetic field produced by the magnet K. The unionized atoms continue their upward path until they condense into droplets and fall back under the action of gravity into the crucible to be vaporized. Resistance heating coils I wrapped around the outside of the vertical column maintain the walls at the vaporization temperature so that the atoms do not condense onto the walls but condense a short distance away from the walls.

The two electrodes...