Pure tungsten electrodes, as one of the earliest electrodes used in argon arc welding, have consistently played a significant role in the welding industry. This type of electrode, characterized by its high melting point, high density, corrosion resistance, and excellent electrical and thermal conductivity, has become an indispensable key material under specific welding conditions.

The types of tungsten electrodes are mainly classified according to the different rare earth oxides or alloy elements doped in them. Here are the common types of tungsten electrodes and their characteristics:

Tungsten disulfide nanosheet (WS₂ nanosheet) is a typical transition metal tungsten compound. There are many different preparation methods, each of which has its own unique principles, operation procedures, advantages and disadvantages.

Tungsten disulfide nanosheet (WS₂ nanosheet) is a typical two-dimensional nanomaterial with a large specific surface area, a low friction coefficient, good electrochemical performance, and optical properties. It has great potential in the fields of nanoelectronics, optoelectronic devices, flexible electronics, lubricating materials, and chemical catalysis. So, what are the factors that affect tungsten disulfide nanosheet performance?

Tungsten disulfide nanosheet (WS₂ nanosheet), as a typical transition metal sulfide material, is a semiconductor material with a hexagonal crystal structure (space group P6₃/mmc). Each layer is a sandwich structure formed by a W atomic layer sandwiched between two S atomic layers. Research indicates that a single layer of WS₂ has a direct band gap of about 1.8eV, enabling it to exhibit a quantum efficiency superior to that of indirect-band-gap semiconductors in the optoelectronic device field. The room-temperature carrier mobility of a single-layer WS₂ nanosheet can reach 100-300cm²/V・s, and the electron concentration is approximately 1×10¹²cm⁻², significantly outperforming traditional silicon-based materials. Notably, the electron mobility of WS₂ nanosheet shows obvious thickness dependence. For instance, the mobility of a 10-layer structure can drop to below 50cm²/V・s, closely related to the enhancement of interlayer phonon scattering.

Tungsten wire, as a metallic material possessing extremely high melting point, hardness, and electrical and thermal conductivity, not only holds a significant position in industries such as manufacturing, electronics, and aerospace but has also demonstrated unique value in medical applications in recent years.

High-density tungsten alloy is mainly made of tungsten (usually between 85% and 99%) as the matrix, with nickel, iron, copper and other elements added through the powder-metallurgy process. It is characterized by high density, high strength and hardness, good electrical and thermal conductivity, a small thermal-expansion coefficient, excellent corrosion and oxidation resistance, good machinability and weldability, and outstanding radiation-absorption capacity. Due to its unique properties, high-density tungsten alloy has numerous applications.

When considering why the honeycomb-electric-field oil-fume purifier selects the tungsten needle as its core component, one must deeply understand the unique properties of the tungsten needle and its crucial role in the oil-fume purification process.

Tungsten disulfide nanosheet (WS₂ nanosheet) is a two-dimensional nanomaterial with a unique structure. Its crystal structure consists of a layer of tungsten atoms sandwiched between two layers of sulfur atoms, forming a sandwich-like layered arrangement through covalent bonds and van der Waals forces. This structure gives WS₂ nanosheet excellent physical and chemical properties, making it widely used.

Tungsten oxide is a typical transition metal oxide and a common tungsten compound. Its chemical formula is usually expressed as WO₃, but in practical applications, due to the existence of oxygen vacancy, its chemical composition may deviate from the ideal stoichiometric ratio, so it is often expressed as WO₃₋ₓ (where x is between 0 and 1). This oxygen vacancy phenomenon causes tungsten to be pentavalent or tetravalent in tungsten oxide, further enriching its physical and chemical properties.