Powder metallurgy technology has also embarked on a personalized path
time：2020-06-17Views：757 Author：Best Seiko
The powder metallurgy process is bound to involve the preparation of powders, which is currently showing a "diversified" trend. Under this trend, how should metal powder injection molding manufacturers choose powder metallurgy technology? The following is a brief description of the “diversified” powder metallurgical milling technology and the milling process by the editor of Guangdong Dahong New Materials. The preparation process of powder metallurgy can be divided into three categories: 1. Rapid solidification atomization powdering technology; 2. Mechanical alloy powdering technology; 3. Ultrafine powder preparation technology. Powder metallurgy's rapid solidification and atomizing powder technology is relatively straightforward, that is, the liquid metal or alloy is crushed and quickly condensed to obtain powdery materials. This type of milling technology can effectively reduce the segregation of alloy components, so the alloy powder components obtained are relatively uniform. Due to the different atomization media used, the atomization methods used in powder metallurgy powdering technology also have a variety of options, such as second-stream atomization, gas atomization, high-pressure water atomization, centrifugal atomization, vacuum atomization, etc. In the two-stream atomization, when the atomizing medium and the metal liquid stream are sprayed through the nozzle, the two liquid streams collide with each other, thereby crushing the liquid stream and spraying the powder. In the gas atomization method, the gas pressure generally reaches 2 to 8 MPa, and the smooth surface powder particles that can be prepared on this basis are used in powder metallurgy. The high-pressure water atomization method uses higher-density water as the atomizing medium, so the condensation rate achieved is orders of magnitude higher than that of the general gas atomization method, so the shape of the powder obtained is generally irregular. Mechanical alloying powdering technology is a method of preparing alloy powders or composite powders from elemental powders. It is completed in a high-energy ball mill and requires long-term grinding between powder particles and between powder particles and grinding balls. The powder will be broken and torn. The ultra-fine powder preparation technology in powder metallurgy, because of the small particle size, the powder produced by this technology has significantly different physical, chemical and mechanical properties.