Ningbo Materials Makes Progress in Preparation of Amorphous Powder Preparation Technology
Amorphous magnetic powder has excellent soft magnetic properties, good mechanical properties, high reactivity and catalytic properties, and has been widely used in aerospace, ship, automotive, metallurgy and chemical industries. The high-quality amorphous magnetic powder has the characteristics of fineness, high purity, spheronization, and concentration distribution. However, the commonly used methods such as the amorphous strip crushing method and the water atomization method have problems of irregular powder morphology, wide particle size distribution range, and high oxygen content. Due to the limitation of the technical level in the country, the development of amorphous magnetic powder preparation equipment is progressing slowly and there are fewer related production enterprises. Therefore, it is urgent to develop a new type of amorphous amorphous powder manufacturing equipment that masters the core technology.
The Amorphous Soft Magnetic Group, a key laboratory of magnetic materials and devices of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, has developed a new multi-stage crushing and atomization milling technique by learning from foreign advanced technologies. Its main working principle is: firstly overheating the metal liquid. Gas atomization is performed at a certain temperature to atomize the metal liquid into droplets. In the process, the smaller droplets condense and shrink into spheres to obtain partially completely solidified spherical fine alloy powder; relatively large unsolidified or semi-solidified The droplet enters the rotating disk rotating at a high speed. Under the action of the impact centrifugal force, the metal droplets are ejected in a tangential direction to form finer droplets, and the droplets rapidly solidify into metal powder. The average particle size of the droplets after centrifugation can be reduced to about 10 μm. The method has the advantages of high cooling speed, fine powder particle size, narrow distribution range, low production cost, low system energy consumption, stable process, and safety and reliability. The related technology has applied for a national invention patent (application number .5) and is Development of pilot plant with partner companies.
In the process of equipment development, the team members participated in the design and optimization of the equipment drawings, assisted in the evaluation and determination of the pilot equipment manufacturers, and checked the quality and specifications of the various components of the equipment to ensure that the multi-stage crushing and atomization equipment Successfully developed. In order to determine the best preparation process for iron-based amorphous alloy powders, the team dispatched the whole person to participate in the exploration of the milling process of the pilot plant, through optimizing the melt superheat, holding time, metal flow, gas injection direction, injection pressure Size, cooling water size and direction, rotary disk position and rotation speed and other process parameters, solve the key technical issues such as powder heap, nozzle clogging in the powder preparation process, the average diameter of the prepared powder is 17μm, and single stage Compared with the gas atomization method, a 72% reduction was achieved, and the comminution effect was remarkable, and the preparation of a fine spherical amorphous powder with a concentrated particle size distribution was realized. In the future, both parties will strengthen cooperation to achieve the large-scale preparation of amorphous magnetic powder, and promote the industrialization of related technologies.
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