It is easy to produce "cracks" when tungsten alloy bar is formed by traditional process, and the forming cost is quite high. Therefore, molding researchers are trying to find more economical and better quality process. According to statistics, more than 70% of tungsten alloy bars in the world are extruded.
Because of the high static pressure, the extrusion technology has been widely used in material processing because of its great deformation and the advantages of continuous forming. It can not only be used to form rod, tube and wire, but also can prepare various kinds of special-shaped materials and composite materials.
Powder extrusion (PEM), a branch of extrusion technology, is a mixture of powder and a certain amount of binder and plasticizer. The shape and size of the blank are extruded through the extrusion die hole. It is the product of the combination of traditional plastic forming process and modern powder metallurgy technology. It can be used to form special-shaped parts with equal cross-section and unlimited length. It can be operated at low temperature and low pressure.
In recent years, great progress has been made both in extrusion technology and extrusion equipment at home and abroad. The varieties of products that can be extruded are increasing day by day, and the quality of tungsten alloy bar is improving.
