Tungsten copper wire
Direction for Use
1. Aquadag layer on the surface of wire should be removed before using the wire is not suitable for contacting with iron, nickel, carbon, when the temperature is higher than 1000 . The wires should be preserved in dry room, in which the relative humidity should not surpass 65%, and keeping away from acid or alkali atmosphere.
2. Cleaned wires should be preserved in dry vessels.
How Tungsten Wire is Made
Tungsten copper alloy
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.
2. Presintering - The fragile bar is placed into a refractory metal boat and loaded into a furnace with a hydrogen atmosphere. The high temperature begins to consolidate the material together. Material is about 60% - 70% of full density, with little or no grain growth.
3. Full Sintering - Bar is loaded into a special water-cooled treating bottle. Electric current will be passed through the bar. The heat generated by this current will cause the bar to density to about 85% to 95% of full density and to shrink by 15% or so. Additionally, tungsten crystals begin to form within the bar.
4. Swaging - The tungsten bar is now strong, but very brittle at room temperature. It can be made more malleable by raising its temperature to between 1200'C to 1500'C. At this temperature, the bar can be passed through a swager. A swager is a device which reduces the diameter of a rod by passing it through a die which is designed to hammer the rod at about 10,000 blows per minute. Typically a swager will reduce the diameter about 12% per pass. Swaging elongates the crystals, creating a fibrous structure. Although this is desireable in the finished product for ductility and strength, at this point the rod must be strees-relieved by reheating. Swaging continues until rod is between .25 and .10 inches.
5. Drawing - Swaged wire of about .10 inches can now be drawn through dies to reduce the diameter. Wire is lubricated and drawn through dies of tungsten carbide or diamond. The exact reductions in diameter depend on the exact chemistry and the final use of the wire. As wire is drawn, fibers again elongate and tensile strength increases. At certain stages it may be necessary to aneal the wire to allow further processing. Wire can be drawn as fine as .0005 inches in diameter.
If you have any interest in our tungsten copper alloy, please feel free to contact us by email:
sales@chinatungsten.com or by telephone: 86 592 5129696, we are at your service all the time.
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