酸化物被覆陰極用ニッケル金属組織とグリッドエミッション

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  • Grid Emission and the Crystal Structure of Core Nickel for Oxide Coated Cathode
  • サンカブツ ヒフク インキョクヨウ ニッケル キンゾク ソシキ ト グリッドエミッション

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抄録

In the production of recieivng tubes having barium oxide coated cathodes, the quality of grid wire material, its surface condition, grid wire temperature and the condition in bulb-pumping procedure have been pointed out as the general factors which cause grid emission so far. Besides the above factors, we found that the crystal structure of core nickel is also the cause of grid emission. It has been confirmed that the free barium produced by the chemical reaction between barium oxide coating and core nickel diffuses to be absorbed into the crystal grain boundaries of the core nickel. Thus, it has been concluded by determination of free barium atoms diffuse into core nickel that the more the nickel grain boundaries exist in the core surface, the lower the grid emission becomes.

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