Discharge Characteristic of Application of the Hollow Cathode Discharge (HCD) to Plasma Sintering

For a better application of Hollow Cathode Discharge(HCD) to powder metallurgy sintering,with the pressed stainless powder cylinder and parallelism sheet bar as hollow cathodes,the igniting conditions of HCD and the effects of vacuum width,air pressure,voltage and temperature of hollow cathode have been studied in this paper.The results show that the igniting condition of HCD is the felicitousness combination of vacuum width,air pressure and voltage.The current density of discharge is related to the vacuum width,voltage and air pressure.Under the condition of meeting the requirements of HCD effect,the smaller the vacuum width,the higher the pressure of work gas and the discharge voltage is,and the larger the current density of discharge is.The current density reduces along with the temperature of hollow cathode rise.