Method of forming a secondary emissive coating on a dynode

Details Method of forming a secondary emissive coating on a dynode Method of forming a secondary emissive coating on a dynode

1981-07-27

1983-07-26

Lusignan, Michael R.

Coating processes

Electrical product produced

Electron emissive or suppressive

4271263, 4271264, 427250, 4272552, 4272557, 427350, 427377, 4273833, 427405, 4274192, B05D 512

Patent

active

043954375

ABSTRACT:
A method of forming an emissive coating on a dynode substrate. The method comprises the steps of vapor depositing a composite coating consisting of magnesium and aluminum onto the dynode substrate. A 50 to 500 angstrom thick layer of aluminum is vapor deposited over the composite coating and the aluminum layer is oxidized. The coated dynode is then activated by heating it in an oxygen atmosphere at a pressure of at least 5.times.10.sup.-6 Torr oxygen at a temperature between 270.degree. and 400.degree. C. The resulting secondary emissive coating contains from 1.5 to 90% by weight of magnesium. The coated dynodes are used in channel electron multipliers which are suitable for use in electron display tubes such as image intensifiers or color television display tubes.

REFERENCES:
patent: 2548514 (1951-04-01), Bramley
patent: 3836393 (1974-09-01), Ernsthausen et al.
patent: 3976905 (1976-08-01), Seidman et al.
patent: 4088510 (1978-05-01), Dresner et al.
patent: 4099079 (1978-07-01), Knapp

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