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Advanced powder preparation technology is the basis of modern powder metallurgy and product industrialization, and is the leader of related emerging industries. The widespread application of high -performance and low -cost powder manufacturing technology has promoted the progress of powder metallurgical technology, and has become a very active cutting -edge field for the research of material science and engineering technology today. Powder -based powder -made powder has accounted for 80 % of the total powder in the world today, of which powder is 30 % to 50 % of the powder -made powder, which means that nearly half are completed by gas atomization technology. The spherical, particle size (powder diameter), particle size distribution concentration, metalization and density, and surface quality of the fist -made method are unmatched by traditional chemical powder. The powder obtained by the atomized powder method to manufacture the raw material of electrical contact has the following advantages: the powder is small and the distribution is small, the thinnest can reach 10BTM (1250 mesh), which will help the material tissue refine; The powder of the powder is good, and the natural crystal world can effectively suppress the grains in the production and use of materials; the powder made of electromagnetic stirring melted by induced furnaces. The quality; metallic particles are not easy to reunite and adhesive, and less intangible loss. Because atomized powder technology has the advantages of stable production technology, less controlling factors, high product quality, non -chemical reagent consumption, environmentally friendly pollution, high production efficiency, and low manufacturing costs. The technologies widely used in electrical contact materials manufacturing are also important means of product quality upgrade and new product development.
qi atomization
(1) Water atomization. Water atomization is widely used in the preparation of AU, AG, PD, PT, CO, CU, Ni, FE, Zn powder. Its particle size distribution ranges from 10m to millimeter level, with irregular shapes, poor spherical, and good suppression of forming form. Sexual, small equipment investment scale, low operating cost, water can be used in cycle, its oxygen content ≤0.4 %, and the post -processing process can be restored and removed. The production efficiency can reach 500kg / min, but it is not applicable to live metals such as AL.
(2) Byproma. Similar to the characteristics of water atomization, but oxidation and better spherical, it is conducive to the production of fine Al powder.
(3) qi atomization. Qi -atomization is widely used in SN, PB, A1, BI, CU, AAU, C0, Ni, Fe, Zn powder, and its particle size distribution is from 10m (related to alloy types) to 200 / TM. Good density and liquidity, low oxygen content, production efficiency of 50kg / min, the gas used is mainly N and AR.
(4) Air atomization. Air atomization is widely used in the preparation of A1, SN, PB, CU -SN, CU -Zn powder, similar to gas atomization, low operating cost, but high oxygen content and poor spherical shape.
