Molybdenum foil, tantalum foil and niobium foil
In the existing technology, because the metal cap of the ultra-high voltage short-arc mercury lamp needs to form an electrical connection with the inside of the lamp, the ultra-high voltage short-arc mercury lamp needs to use welding materials to weld different parts including conductive molybdenum foil and electrode to enable the electrical conduction inside and outside the lamp.
At present, the welding method of conductive molybdenum foil of ultra-high pressure short-arc mercury lamp usually uses platinum foil (that is, pure platinum or welding material with molybdenum substrate and platinum-plated surface) to fixed molybdenum foil on the gasket. As platinum is the basic solder in welding process of ultra-high pressure short-arc mercury lamp, it is not only applied to the welding of molybdenum foil and metal rod containing circular gasket. It is also used in the welding of molybdenum foil and metal rod containing slurry gasket.
The explosion of ultra-high voltage short-arc mercury lamp is caused by platinum solder, which may cause safety risks in the use of ultra-high voltage short-arc mercury lamp. Specifically, in the operation of ultra-high voltage short-arc mercury lamp, platinum reacts with the mercury vapor in the ultra-high voltage short-arc mercury lamp, so that the connection between molybdenum foil and gasket gradually loosens and falls off, and the contact resistance and temperature will rise and explode. This kind of hidden danger will not only blow up the optical engraving machine, but also cause some damage to the optical system, but also cause the production stop.
Tantalum foil or niobium foil, tantalum and niobium have extraordinary corrosion resistance to mercury and its vapor, to a certain extent can solve the ultra-high pressure short arc mercury lamp explosion problem.
