陰極酸化物結晶の性状およびエミッションに対する炭酸塩サスペンジョン中の不純物の影響
1962 年 31 巻 12 号 p. 1009-1016
詳細
1962 年 31 巻 12 号 p. 1009-1016
Pure grade commercial alkaline earth carbonate contains some impurities such as NaNO3, MgO, SiO2, Al2O3, etc. which are mixed up with the raw material in manufacturing process mainly by the use of alkaline earth nitrates, precipitation solution and ballmill. These impurities except MgO have detrimental effects upon emission and spark characteristics of the cathode, for they are apt to react with the oxide coating; observation under electron microscope reveals sintering and fusing on the cathode surface. On the other hand, the cathode prepared from pure alkaline earth carbonate suffers high evaporation of activated matter and is liable to form undesirable interface layer.
