Electric lamp and discharge devices – With positive or negative ion acceleration – Supplying ionizable material
Patent
1984-11-20
1987-08-11
Niebling, John F.
Electric lamp and discharge devices
With positive or negative ion acceleration
Supplying ionizable material
204 371, 204 385, 204 40, 250423R, 313336, 4273768, 427405, 427431, H01J 2702, H01J 3708
Patent
active
046864148
ABSTRACT:
A process for enhancing the wettability of evaporation elements, such as substrates and metal reservoirs used in liquid metal ion sources, and the elements so produced wherein a coating material is wettably coated onto the evaporation element at a coating temperature greater than the ion source operating temperature. The coated element is cooled to the operating temperature, and then contacted with the molten ion source alloy. The coating material is selected to wet the substrate or reservoir at the coating temperature, but to be itself wet by the ion source alloy at the ion source operating temperature. The preferred coating metal is gold, which is first applied by electrodeposition onto the evaporation element, and the evaporation element and coating are heated to a coating temperature of about 800.degree. C. to complete the coating step. The coated evaporation element is cooled to the source operating temperature of 200.degree. C.-300.degree. C. and dipped into the ion source alloy, which may be an alloy such as lead-gold-arsenic or lead-gold-antimony.
REFERENCES:
patent: 2640020 (1953-05-01), Pollard
patent: 4318030 (1982-03-01), Jergenson
patent: 4367429 (1983-01-01), Wang et al.
Clark Jr. William M.
McKenna Charles M.
Sharapata Irwin R.
Denson-Low Wanda K.
Hughes Aircraft Company
Karambelas A. W.
Leader William T.
Niebling John F.
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