Preparation of liquid metal source structures for use in ion bea

Details Preparation of liquid metal source structures for use in ion bea Preparation of liquid metal source structures for use in ion bea

1985-04-08

1986-10-14

Page, Thurman K.

Coating processes

Vacuum utilized prior to or during coating

4273767, 4273768, 4274432, B05D 302

Patent

active

046172033

ABSTRACT:
A process for preparing a liquid metal ion source structure, preferably made from graphite, so that it may be wetted with boron-containing alloys. The process first involves the coating the source structure with elemental boron. The boron is preferably furnished as boron powder in a liquid carrier which may then be coated onto the surface of the source structure substrate. The coated structure is heated for a short time to a temperature whereat the source structure substrate and boron form a liquid layer at the surface of the substrate to "boronize" the substrate. The final wetted source structure is achieved by mixing a small amount of free boron powder with the alloy to be ion evaporated (also in powdered form), coating the previously boronized source structure with this mixture and heating the contacted boron-augmented source alloy and source structure to a temperature of at least the solidus temperature of the source alloy, at which point the source structure is wetted. Once wetted, a flow of source alloy toward the emitter tip of the source structure can be established during operation of the ion source. Prior boronizing may be omitted for some boron carbide source structures.

REFERENCES:
patent: 2659685 (1953-11-01), Lafferty
patent: 2996412 (1951-08-01), Alexander
patent: 3369920 (1968-02-01), Bourdeau et al.
patent: 3503118 (1970-03-01), Criscione et al.
patent: 3549408 (1970-12-01), Bonne

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