The production process of doped tungsten alloy is lengthy, including the main stages of tungsten smelting, powder metallurgy billet making and plastic processing.
The production of doped tungsten alloys usually uses ammonium paratungstate (APT) as the raw material. In addition to the traditional classic process of preparing ammonium paratungstate from tungsten concentrate, international studies on extraction and ion exchange were carried out in the 1950s. China also adopted these processes in the 1970s, thus simplifying the process and improving the tungsten The recovery rate. Since the 1960s, many countries have successively adopted the blue tungsten oxide doping process instead of tungsten trioxide doping, thereby improving the doping effect. The pickling of tungsten powder was used in production in the 1960s. Its main purpose is to wash away excess dopants, ultrafine powder and some harmful impurities in tungsten powder, thereby improving processing performance and improving the high temperature performance of tungsten wire. . Since the 1960s, the pass rolling method has been continuously applied. Pass rolling is to make the billet pass through the pass of a pair of rotating rolls, and under the action of the roll pressure, the section is reduced and the length is extended.
Although only a small part of tungsten ore is finally made into lamp tungsten wires and similar products, the most important scientific and technological significance of tungsten is the conversion of its research results to practical applications. The knowledge gained is of inestimable value in the new field of powder metallurgy, especially in the manufacture of cemented carbide.