Molybdenum
There are pure Molybdenum and doped Molybdenum.
1. Pure Molybdenum (Non-doped)
Pure Molybdenum wire
Overview
Molybdenum material with purity over 99.95%. Pure molybdenum without additives are used for Magnetron parts and electrode for ceramic metal halide lamps that should not contain outgas. It is also used as mandrel for manufacturing high color temperature tungsten filaments. Unlike Iron and other metals, with its high melting point, high temperature heat treatment on coiled tungsten on molybdenum mandrel is possible. It can be disolved by combination of nitric acid and sulfric acid which does not disolve tungsten.
Due to the fact that pure molybdenum does not contain additives, compare to doped molybdenum, mechanical strength under high temperature is weak. It gets brittle when welding.
Example of using pure molybdenum
Electrode for ceramic metal halide lamp. Molybdenum powder is used as raw material for cermet.
Molybdenum coil for cerami metal halide lamp electrode.
Assembled electrode with welded molybdenum foil.
Material information on other pages.
2. Doped molybdenum
Doped molybdenum wire
Overview
Potassium is added to molybden with purity higher than 99%, in order to enhance mechanical strength under high temperature. For lamp manufacturing, doped molybdenum is commonly used as a support pilar for electrode. Molybdenum is widely used at various production process of lamps where heat is exerted on quarts glass (such as pinching process and sealing process). Molybdenum with high melting point is an ideal metal for lamp production.
Molybdenum plate is also widely used as parts for high temperature furnace. Other than potassium, we can add rare metals such as Y and Ce, or oxide of these to meet customer needs.
Example of using doped molybdenum.
Molybdenum has excellent mechanical strength under high heat, it has very wide range of uses. Below mold is made of doped tungsten to shaping tungsten coil.
Doped molybdenum jig