Molybdenum Disc in Rotating Anode Tube and Drill
As what we have seen from above picture, molybdenum disc is used. Rotating anode came into use in 1929, but the first construction of rotating anode tube was done by Wood in 1897. The modern rotating anode tube with disk-shaped, normally made of molybdenum. Molybdenum disk is used as main material, because it has twice the heat capacity of a pure tungsten disk with the same mass.
Molybdenum discis also used in other products, as a small but important part.
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The molybdenum discs have similar thermal expansion to silicon. They are widely used as contact materials in silicon controlled rectifier diodes, transistors and thyristors, mounting material for power semiconductor devices and heat sink bases.
Cleaned molybdenum wire, namely white molybdenum wire, is molybdenum wire removes graphite coating on the surface by using the methods of electrolytic cleaning and hydrogen-sintered cleaning, and has a good bright and shiny surface. The diameter of cleaned molybdenum wire is ranging from 0.05mm to 3mm.
Spray molybdenum wire is regularly covered with graphite. When removed graphite, spray molybdenum wire is metallic luster. It has a good high-temperature tensile strength and corrosion resistance after sintering, forging, and drawing.
Pure molybdenum can be presented in many types. Molybdenum bar is one popular product made of molybdenum. Therefore, molybdenum bar shares the properties of molybdenum, which are high melting point, good thermal conductivity and low thermal expansion. At high temperature, they can resist oxidation and have high strength without any distortion during the procession, etc.