Powder metallurgy is a process for making metal powders, as well as the use of forming and sintering processes to produce metal powders into articles. With the continuous development of modern technology, a variety of new processes have emerged, but also has been very widely used. In our powder production process, including the preparation of powder, powder mixture and so on. Many times we are in order to improve the moldability and formability of our powder. Usually we add plasticizers such as gasoline, rubber or paraffin during the production process.