直熱型整流管用酸化物被覆陰極の研究

概要

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Measurement was made of the electron emitted from the oxide-coated cathodes in the directly heated rectifier during both thee normal and the accelerated life test. The accelerated life test was made by applying cathode voltage 10% higher than the normal rating. The emitted current was measured by two methods, the measurement of the component dc of the current put out I_0 and the measurement of the dc saturated in the emission I_s. It seems that the most effective and shortest life test in the evaluation of the cathodes in rectifier on the quality level is the measurement of I_s at accelerated life test. It was found in the above mentioned life test that increase of oxide-coating was effective to prevent decay in the emission of electron. Addition of nickel powder in to oxide coating was effective to prevent rectifier from sparking between anode and cathode and gave no harmful influence on electron emission from cathode.
社団法人日本材料学会の論文
1968-11-15