Transparent quartz glass softening temperature, thermal shock resistance, is the best source of strong light material

Transparent quartz glass softening temperature, thermal shock resistance, strong light source material is the best, most high-intensity discharge lamps are quartz glass as the arc  tungsten carbide ball  material. However, due to the expansion coefficient of quartz glass is low (room temperature to 1000 ℃, α = 5.5 × 10-7 / K) and the sealing temperature (2000 ~ 2200 ℃), so find similar coefficient of thermal expansion match with the refractory metal sealing. However, quartz glass with the blade-like molybdenum foil (temperature α = 5.3 × 10-6 / K) to be well sealed non-matching, the molybdenum  molybdenum foil  inner tube plays a dual role. In the 1960s and 1980s, China's major will be 0.55 mm thick sheet of pure molybdenum foil cut to a width of 2 ~ 4 mm, length 100 ~ 150 mm narrow-band, and then into a bladed electrolytic corrosion sealing material. Disadvantage is that the process is unstable quality, consistency is poor, low productivity, material loss, a more continuous operation can not adapt.