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Spiral Cathodes for Microwave Heating Magnetrons by B.Ch. Djubua; B.N. Ilyin; O.V. Polivnikova; E.M. Zemchikhin is a Materials Science article available to read on EtoBox.

What is Spiral Cathodes for Microwave Heating Magnetrons about?

Cathodes have been developed for magnetrons for microwave heating using thermally stable alloys of an activator metal and a platinum group metal as a surface layer on the cathode. Metal alloy cathodes (MAC) utilizing IrsLa or Re2Th were tested and shown to be capable of operating at a lower temperature than carburized thoriated tungsten or pure tungsten cathodes. An alternative cathode configuration was developed and tested in which a spiral wound cathode had an additional source of activator metal installed as a bushing on a rod within the hollow interior of the winding and heated by radiation. When the spiral is heated the active metal evaporating from the source initially is adsorbed on the inner surface of the spiral and then migrates to the external surface via surface diffusion. Three variations of this cathode configuration were tested. At T = 1000°Cbrighmess and with a collector current of 2 to 3 A/cm 2 the cathode life without replenishment is 3000 h and the provision of an activator replenishment source was found to permit a potential severalfold increase in life. A 6000 h operating life has been achieved to date and the life tests are presently still being continued.

Who reads Spiral Cathodes for Microwave Heating Magnetrons?

Author

B.Ch. Djubua; B.N. Ilyin; O.V. Polivnikova; E.M. Zemchikhin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0169-4332)

Published

1997

Language

EN

Field

Materials Science (Physical Sciences)