| 摘要 |
An impregnation type cathode for a cathode ray tube includes a porous cathode piece having electron emission material impregnated therein. The porous cathode piece has a layer of W-Sc (or a layer of W-Sc2O3) on its surface and a layer of alloy formed of at least two elements of a group of elements consisting of Ir, Os, Ru, and Re on the layer of W-Sc (or the layer of W-SC2O3)
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