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

H - Electricity

01

J

313/77, 117/82

H01J 43/04 (2006.01) C23C 14/58 (2006.01) H01J 9/12 (2006.01) C23C 14/16 (2006.01)

Patent

CA 1163150

PHB. 32,649. 13 ABSTRACT: A method of forming an emissive coating on a dynode substrate. The method comprises the steps of vapour depositing afor example by evaporating or sputter- ing) a composite coating consisting of magnesium and aluminium onto the dynode substrate. A 50 to 500 .ANG. thick layer of aluminium is vapour deposited over the composite coating and the aluminium layer is oxidized. The coated dynode is then activated by heating it in an oxygen atmosphere at a pressure of at least 5 x 10-6 Torr oxygen at a temperature between 270 and 400°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 colour television display tubes.

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