Low pressure arc spraying(LPAS) represents a promising method of depositing highly pure, dense and corrosion-resistant coatings of reactive materials such as titanium or tantalum. The critical pressure, below which the process becomes unstable, is rep...
Low pressure arc spraying(LPAS) represents a promising method of depositing highly pure, dense and corrosion-resistant coatings of reactive materials such as titanium or tantalum. The critical pressure, below which the process becomes unstable, is represented as a function of spraying current and voltage within characteristic stability fields. An increase in stability with increasing current and falling voltage is observed.
Stable operation below 300 hPa is guaranteed only in the presence of additional
stabilizing measures. A new design of low pressure arc spray gun enabled a stable electric arc to be maintained down to a chamber pressure of 100 hPa.