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>>Tungsten wires production process
Making tungsten wire is a complex, difficult process. The process must be tightly controlled in order to insure the proper chemistry as well as the proper physical properties of the finished wire. Cutting corners early in the process to reduce wire prices can result in poor performance of the finished product.
Refining tungsten from ore cannot be performed by traditional smelting since tungsten has the highest melting point of any metal. Tungsten is extracted from ore through a series of chemical reactions. The exact process varies by manufacturer and ore composition, but ores are crushed then roasted and/or sent through a variety of chemical reactions, precipitations, and washings to obtain ammonium paratungstate (APT). APT can be sold commercially or further processed to tungsten oxide. Tungsten oxide can be roasted in a hydrogen atmosphere to create pure tungsten powder with water as a by-product. Tungsten powder is the starting point for tungsten mill products, including wire.
Then make pure tungsten powder into tungsten wire through following processes.
1. Pressing - Tungsten powder is sifted and mixed. A binder may be added. A fixed amount is weighed and loaded into a steel mold which is loaded into a press. The powder is compacted into a cohesive, yet fragile bar. The mold is taken apart and the bar removed.
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