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引论通常.电子管氧化物阴极都是由镍基底与其上涂复的碱土金属氧化物多孔层构成的。在镍基底中含有浓度极低的还原剂,比如镁、硅和铝等等。在高温下,这些还原剂不断地向氧化物涂层扩散,并使少量氧化钡还原成钡,这对于激活氧化物的发射面来讲,游离钡的存在是十分必要的。关于氧化物阴极的上述工作机理是共所周知的。在常规氧化物阴极中,可用镍基金属冲制成阴极帽,再用点焊法将阴极帽焊接征用镍铬合金制成的阴极套上,镍铬合金的成分按重量
In general, the tube oxide cathode is made of a nickel substrate and a porous layer of alkaline earth metal oxide coated thereon. Contains very low concentrations of reducing agents in the nickel substrate, such as magnesium, silicon and aluminum. At high temperatures, these reducing agents continuously diffuse to the oxide coating and reduce a small amount of barium oxide to barium, which is necessary for the activation of the oxide’s emitting surface. The above described working mechanism for oxide cathodes is well known. In the conventional oxide cathode, the cathode cap can be made from nickel-based metal, and the cathode cap can be soldered by the spot-welding method to the cathode sheath made of nichrome. The composition of the nichrome is determined by weight