Black tungsten wire is a filament made of tungsten metal. Usually, the surface is not polished or specially treated, and the graphite emulsion is attached, showing a dark gray or black appearance, hence the name "black tungsten wire". Tungsten is a high melting point (about 3422°C), high density, corrosion-resistant metal, and is widely used in many fields due to its excellent physical and chemical properties. Black tungsten wire is mainly made by powder metallurgy and wire drawing. Its surface may retain trace oxides due to oxidation or production process, so the color is darker.

The high melting point and conductivity of tungsten wire make it an ideal heating element. The application of tungsten wire in automobile defrosting glass is mainly reflected in the electric heating defrosting system, especially in the defrosting function of rearview mirror, rear windshield and part of the front windshield.

The application of tungsten wire in automobile defogger glass is mainly reflected in the defogger heating system of rearview mirror and rear windshield, which achieves rapid heating defoggering through its high resistance and high heat resistance, improving driving safety.

Across the vast and boundless ocean, ships and marine engineering structures are like drifting "islands," constantly facing the challenges of a complex and ever-changing marine environment. The relentless pounding of waves, the fierce blowing of sea winds, the periodic rise and fall of tides, and the continuous impact of ocean currents all place extremely high demands on the stability of marine engineering structures and ships. A slight misstep could cause a ship to lose balance, leading to cargo damage or threats to personnel safety. Similarly, stability issues in marine engineering structures could disrupt operations, result in significant economic losses, and cause severe environmental damage.

Like sodium tungsten bronze (NaₓWO₃) and potassium tungsten bronze (KₓWO₃), ammonium tungsten bronze ((NH₄)ₓWO₃) is also a type of tungsten bronze. Although NaₓWO₃, KₓWO₃, and (NH₄)ₓWO₃ share similar crystal structures, such as cubic or tetragonal forms, their physicochemical properties and applications differ slightly due to the varying elements added.

As a typical tungsten product, tungsten wire is a fine filament made by forging and drawing tungsten rods, known in English as tungsten wire, with a tungsten content generally exceeding 99.95%. However, due to the high hardness and brittleness of metallic tungsten, which makes processing difficult, small amounts of potassium oxide, silicon oxide, and aluminum oxide are often added during production. The resulting modified tungsten wire is commonly referred to as doped tungsten wire, 218 tungsten wire, or non-sagging tungsten wire, offering superior overall performance compared to pure tungsten wire.

As a typical representative of rare earth tungsten electrodes, the cerium-tungsten electrode is an electrode product with an appropriate amount of cerium oxide added to a tungsten base. It is a non-radioactive, refractory, or non-consumable metal electrode material, serving as the preferred substitute for thorium-tungsten electrodes. Known in English as the cerium tungsten electrode, it features a gray color-coded tip. The cerium oxide content is generally 2%, with electrode diameters ranging from 0.5 mm to 12.0 mm and lengths of 150 mm or 175 mm.

Based on differences in chemical composition and structural components, common hard alloys can be categorized into steel-bonded hard alloys, tungsten-cobalt alloys, tungsten-titanium-tantalum-cobalt alloys, and Tungsten-Titanium-cobalt alloys, with their physicochemical properties and applications being largely similar.

Composite tungsten electrode materials can be categorized into thorium-tungsten electrodes, cerium-tungsten electrodes, yttrium-tungsten electrodes, zirconium-tungsten electrodes, and lanthanum-tungsten electrodes, depending on the additives used. Although all these tungsten electrodes are primarily made from the refractory metal tungsten, their physical and chemical properties and applications vary slightly due to differences in modifiers.

Phosphorus element, as a typical harmful impurity in tungsten-nickel-iron alloy, is typically controlled to below 0.01%. Even in trace amounts, it influences the alloy’s mechanical properties, corrosion resistance, and processing stability through grain boundary segregation and compound precipitation.