A colloidal graphite lubricant, which imparts a black coating to "as drawn" tungsten wire, is used to protect the wire from oxidation and to lubricate the wire as it passes through the die. Many applications require tungsten wire with characteristics other than those obtainable in "as drawn" wire. A variety of processes produce wire with a cleaned surface or with a special finish.
After drawing operations have been completed, the wire may be cleaned by exposure to elevated temperatures in a reducing atmosphere. Treating the surface chemically or electrolytically can also clean tungsten wire. (The diameter of the wire may be further reduced after drawing by electrolytic etching.)
The cleaned wire can be electroplated with such elements as gold, silver, nickel and copper, for use primarily in electronic tubes.
Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn