High Quality Dia0.6mm Tungsten Wire Parts High Hardness

Description:

Tungsten filaments are mostly produced with ammonium paratungstate (APT) as raw material. The general process is to roast ammonium paratungstate in air at about 500℃ to tungsten trioxide, or slightly reduce it to blue tungsten oxide in hydrogen at about 450℃. The tungsten filaments for making incandescent lamp filaments need to be doped with a small amount of potassium oxide, silicon oxide and aluminum oxide in tungsten trioxide or blue tungsten oxide. The total amount of the three should not exceed 1%. This is the tungsten filament doping process invented by Baz in 1922. The tungsten oxide after doping is reduced to metal tungsten powder with hydrogen. The reduction process is generally carried out in two steps: the first step is reduced to tungsten dioxide (brown tungsten oxide) at about 630℃, and the second step is reduced to metal tungsten powder at about 820℃. The purpose of the two-step reduction is to make the added potassium fully play its role and control the powder particle size. The doped tungsten powder obtained in this way is then pressed into a long and thin square bar in a special mold. The square bar is energized in hydrogen and sintered by self-resistance heating (temperature up to about 3000℃). After sintering, the density of the tungsten bar can reach more than 85% of the theoretical value. This tungsten bar can be processed into a tungsten rod with a diameter of about 3mm by rotary forging, and then further processed into tungsten wires of various thicknesses by die drawing. For example, the diameter of the tungsten wire used in a 220V, 15W incandescent lamp is about 15?m, while the diameter of the tungsten wire used in a 10000W bromine tungsten lamp is about 1.25mm. Thinner tungsten wires, such as the tungsten wire of a 220V, 10W incandescent lamp with a diameter of about 12?m, must be made by electrolytic corrosion.
When the diameter of the tungsten wire reaches the micron level, it is difficult to accurately measure its diameter with a conventional caliper. Therefore, internationally, the thickness of tungsten wire with a diameter of less than 0.2mm is usually expressed by the weight of a 200mm long wire segment. For example, the diameter of the 15W incandescent lamp tungsten wire mentioned above can be expressed as 0.679mg/200mm.

Specifications:

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FAQ:

Q: What information should I let you know if i want to get a quotation?

A: The required material dimension (Thickness*Width*Length,diameter*length; if possible, please kindly supply us drawings).
The required more information, such as Surface Condition, Tolerance Request, The Quantity, and other mechanical and technical details.

If it is possible, please also provide the application of products, we will recommend the most suitable products with details for confirmation.

Q: How do you gurantee the quality of the products?

A: Each step of production and finished products will be carried out inspection by QC department before storing in the warehouse. NG goods are not allowed in the completed goods warehouse.

Q: Can you guarantee the prompt delivery?

A: Yes, when we get your inquiries, not only we will evaluate the more competitive price, but also we can get the most reasonable delivery time. So the prompt delivery can be guaranteed.

Q: What is the shipping cost?

A: The shipping cost is determined by the destination port, weight, packing size, total CBM of the products, we will try best to get the most reasonable shipping cost from the forwarders or express couriers to help you save more money.

Q:What is the transportation way?
A:If the Gross Weight ≤45kg, it's better by express such as TNT, DHL, FedEx,, etc.
If the Gross Weight between 45kg to 100kg, by express or by air to your nearest airport can be both considered.
If the Gross Weight ≥ 100kg ,you can choose by Air or Sea to the nearest port.