Tungsten wire filament
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Tungsten wire is characterized by durability, hardness, high melting point, the minimum evaporation rate when heated, the minimum coefficient of thermal expansion, higher electrical resistance. Such wire is characterized by a high modulus of tension and compression, exceptional resistance to thermal creep, good thermal conductivity. It is inert in an oxygen atmosphere to 400 °C, hydrogen to 600 °C, ammonia to 700 °C, carbon monoxide to 800 °C, in concentrated solutions of acids, alkalis, Aqua Regia, boiling mercury. No tungsten wire it is impossible to imagine nuclear energy, military-industrial complex, modern metallurgy, electrical engineering. Active progress of robotics, petrochemical, process industry also requires such a wire. It is intended for operation in aggressive liquid and gaseous environments in conditions of extreme static and dynamic loads under the highest temperatures.
Because of the extreme refractoriness and hardness, tungsten is poorly processed — only to achieve high temperatures. The disadvantage is the complexity of mining and obtaining it in its pure form. Under normal conditions it is hard, brittle, fragile material.
Tungsten wire and electrodes — the most relevant products of tungsten. Under normal conditions, technological plasticity of the metal is insufficient, but with increasing temperature — increased without loss of strength. That’s why hiring get hot pressure treatment. First using powder metallurgy to form the workpiece — the so-called Fort. After heating it Raskulinecz on a rotary forging machine — out electrodes (rods) section 2 — 3 mm, of which after drawing in the hot condition pull wire of minimum diameter according to GOST 25501−82. Wire comes coils or reeled into the Bay. The thin wire called the filament. The alloying of chromium, cobalt or carbon increases its strength by 20−30%.
Tungsten wire brand VM, resistant to static, dynamic loads, vibration high temperature, the actual radio electronics and x-ray technology for the production of cathodes and heaters. Wire VRN is for the production of bushings, springs, hooks, sleepers. High electrical resistance and maximum light output made tungsten filament HF, W, VRN essential in incandescent lamps. These stamps serve as in instrument engineering for production of spiral cathodes, springs of semiconductor sensors, loop heaters, etc. Industrial chemicals today are widely used tungsten mesh and filters. In medicine, a tungsten wire is used to thermocoagulation and production of special tools. Of the tungsten wire, causing a special coating that produces non-consumable electrodes.
THE TUNGSTEN WIRE GOST 18903−73
Grade of tungsten
|Group||Surface condition||Ø µm||Appointment|
|VA||And||Black||10 — 1500||Spiral lamps. Spiral cathodes and heaters of electronic devices, springs of semiconductor devices.|
|HELL||Black high manufacturability||50 — 1500||Heaters of cathodes and directly heated cathodes with spiral design factor of the core 1 and 2.2|
|AE||Black high-heat resistance||500 — 1200||Directly heated spiral cathodes and heaters cathodes with the working t° or t° heat treatment above 2000°C|
|AP||Black||10 — 200||Loopback heaters, nets, and springs of electronic devices, asperuloside cathodes.|
|B||Purified||11 — 500||Support, hooks, springs, spiral bulbs, spiral heaters and cathodes electronic and gas discharge devices.|
|G||Purified and annealed||Loopback heaters, nets, asperuloside cathodes. Some spotlamp spiral filament|
|T||Etched||5 — 12||. Mesh electronic devices Heaters and cathodes of the directly heated helical and non-helical cathodes.|
|IT||Pickled and annealed|
|VM||And||Black||11 — 1500||Spiral spotlamp filament and parts of the instrument, working at t° to 2100 °C under high mechanical loads (impacts, vibrations)|
|VRN||800 — 1500||Glands, crosshead and other parts that do not require doped tungsten.|
|W-7||20 — 1500||Springs, hooks, cathodes of some electronic and gas discharge devices|
|VT-10||25 — 1500||The cathodes electronic and gas discharge devices|
|VT-15||150 — 1500|
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