電話機用炭素粉の研究
無煙炭の熱分解 (II)
1964 年 1964 巻 39 号 p. 3-8
詳細
1964 年 1964 巻 39 号 p. 3-8
For the purpose to clarify the effects of roasting atmosphers on the properties of carbon powders for telephone transmitter, powders (50-80 mesh) of purified anthracite are roasted in various atmosphers, viz., nitrogen, hydrogen, town gas, charcoal gas liberated from anthracite itself and vacuum.
Electrical, physical and chemical properties of the carbon powders thus obtained are investigated.
It is found that the powders obtained by roasting anthracite powders in the atmosphere of town gas are very stable against humidity and that they are most excellent as carbon powders for telephone transmitter.
