U.S. Philips Corporation

Anton K Niessen

Jan Hasker

Jan T Gerkema

Jacobus E Crombeen

Jozef B Pelzer

Henricus J Stoffelen

By providing at least the top layer of the matrix of a scandate cathode with an alloy or compound which exhibits scandium segregation, a satisfactory recovery for cathodes with a high emission can be achieved after ion bombardment.

Scandate cathode exhibiting scandium segregation

An X-ray tube having a rotary anode which is accommodated in a vacuum-tight housing so as to be rotatable by means of at least one spirally grooved bearing. The mutually cooperating surfaces of the bearing consist essentially of Mo or of an alloy of Mo and W and are effectively wetted by a Ga-alloy serving as a bearing lubricant. In order to extend the life of the X-ray tube, 1 to 4% by weight of Ag and/or Cu are added to the Ga-alloy, as a result of which the formation of crystalline compounds is inhibited.

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Eindhoven, Netherlands

Anton K Niessen