Most of the switch tubes used presently work in the gas spark region ( the right branch of paschen curve ) , and are made of graphite and mental such as tungsten , molybdenum , stainless steel and mercury 目前實際應用的開關管多數(shù)工作在火花放電區(qū)域(巴邢曲線的右支) ,使用的電極材料一般為鎢、鉬、不銹鋼、水銀、石墨等。