Molybdenum News Center

Molybdenum has a high melting temperature and it is impractical to transform it into ingot forms by conventional furnace melting techniques. Its manufacture by powder metallurgy consists of three distinct phases: the decomposition of the ore and its reduction to pure metal powder, the pressing of this powder into bars and the sintering of these bars into solid ingots and the swaging, rolling or drawing of these ingots into desired forms and sizes. Some products are fabricated from arc-cast ingots. Prefabricated or continuously compacted and sintered electrodes made from metal powder are arc-melted in a water-cooled copper mold. The process is usually carried out in a vacuum, although in some instances inert-atmosphere melting is employed.

 

After drawing or rolling operations have been completed, the material may be cleaned by exposure to elevated temperatures in a reducing atmosphere. Treating the surface chemically or electrolytically could also clean molybdenum.

 

The material may be further reduced after processing by electrolytic etching. The cleaned material can be electroplated with such elements as gold, silver, nickel and copper, for use primarily in electronic tubes. Platinum-clad wires are also available.

 

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