ELECTRON GUN PART

PURPOSE:To prevent any deterioration of the characteristic of an electron tube by manufacturing an electron gun part by powder metallurgy using an alloy powder contaning a given amount of Zr or Hf. CONSTITUTION:An electron gun part consists of base crystals 5, an alloy phase 6 composed of Zr and the base, air holes 7 and the like. The Zr component of the alloy phase 6 prevents any decrease in the vacuum degree of the internal atmosphere of a cathode-ray tube by adsorbing th gas emitted when the electron gun part is heated to high temperature. The electron gun part should be manufactured under sufficient supervision in order to prevent any decrease in the getter performance which might be caused when a relatively small amount of Zr or Hf contained in the getter is oxidized during manufacture or preservation. Consequently, it is possible to prevnt any deterioration of the characteristic of the electron tube.