What Are the Different Types of Tungsten Wire?

Doped tungsten wire, also commonly called sag-resistant tungsten wire, tungsten-aluminum wire, is mainly characterized by adding a dispersion strengthening element potassium to tungsten, forming an "interlocking dovetail" interlocking internal grain structure, thereby improving the High temperature creep resistance of tungsten wire.

Production process of doped tungsten wire, including reduction from APT

The grades of doped tungsten wires include W31, W61, W91 and WR15 new high temperature resistant tungsten wires.

Although the brand names of different manufacturers are different, the principle is basically the same. The basic principle of doped tungsten wire multi-brand technology is: According to the requirements of electric light source products for tungsten wires, they are appropriately classified (generally divided into more than three categories). For example, according to the requirements of filaments for high temperature performance, they can be divided into high, medium, and low. According to the requirements of each type of product, a specific process technology is used to produce a corresponding tungsten wire series with this characteristic, that is, a certain type of tungsten wire.

These specific process technologies include: the definition of raw materials, the different reduction processes of blue tungsten oxide and tungsten powder, the different doping processes, the changes in dopants, and the corresponding matching processing processes. Finally, strict product performance testing and classification are also necessary ^[2]

The general grade classification method is: choose the tungsten wire suitable for general requirements as a basic grade (the tungsten wire of this basic grade must be mass-produced by mainstream technology), and then expand the corresponding characteristics on this basis To form different related grades. Take the tungsten wire grade of Japan Tungsten Company as an example. There are five grades of doped tungsten wire including B001, B150, B584, B701, and N876. Its basic grade is B001. In order to further increase the high temperature resistance of tungsten wire, B584 grade has been developed; in order to increase the high temperature and shock resistance of tungsten wire, B701 grade has been developed; For special requirements, N876 grades were developed ^[3] .