
Black tungsten wire means the tungsten wire that has not been processed by cleaning. And it was found that the “black” on the surface was formed by the adhesion of graphite and tungsten oxide. Graphite acts as a lubricant for the drawing process. Tungsten oxide on the surface is generated using natural gas or electricity to heat the tungsten wire. The cleaned black tungsten wire, i.e., tungsten wire, has the characteristics of good electrical and thermal conductivity, high melting point…