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Application and comparison of advantages and disadvantages of metal alloy powder prepared by physical method

wallpapers News 2021-06-24
Application and comparison of advantages and disadvantages of metal alloy powder prepared by physical method
Ball milling
Mechanism: Ball milling method is mainly divided into rolling ball method and vibration ball milling method. This method utilizes the mechanism that metal particles are broken and refined by straining at different strain rates.
Application: This method is mainly suitable for the preparation of metal alloy powders such as Sb, Cr, Mn, Fe-Cr alloy.
Advantages and disadvantages: The advantage is continuous operation, high production efficiency, suitable for dry and wet grinding, and can be used for metal alloy powder preparation of various metals and alloys. The disadvantage is that the selectivity of materials is not strong, and it is difficult to classify in the metal alloy powder preparation process.
Grinding method
Mechanism: The grinding method is to spray compressed gas into the grinding area after passing through a special nozzle, so as to drive the materials in the grinding area to collide with each other and rub into metal alloy powder; after the airflow expands, the material rises into the classification area and is sorted by the turbine classifier For materials that reach the particle size, the remaining coarse metal alloy powder returns to the grinding zone to continue grinding until the required particle size is separated.
Application: It is widely used in ultrafine grinding in non-metals, chemical raw materials, pigments, abrasives, health care drugs and other industries.
Advantages and disadvantages: Because the grinding method adopts dry production, the process of dehydration and drying of the material is omitted; the product has high purity, high activity, good dispersibility, fine particle size and narrow distribution, and smooth particle surface. However, the grinding method also has high equipment manufacturing costs. In the production process of metal alloy powder, continuous inert gas or nitrogen must be used as a compressed gas source, which consumes a large amount of gas and is only suitable for the crushing and metal alloy powdering of brittle metals and alloys.
Atomization
Mechanism: The atomization method generally uses high-pressure gas, high-pressure liquid or high-speed rotating blades to break the metal or alloy melted at high temperature and high pressure into fine droplets, which are then condensed in a collector to obtain ultra-fine metal alloy powder. The process does not undergo chemical changes. The atomization method is one of the main methods for producing metal and alloy metal alloy powders. There are many atomization methods, such as dual-flow atomization, centrifugal atomization, multi-stage atomization, ultrasonic atomization technology, tight-coupling atomization technology, high-pressure gas atomization, laminar flow atomization, ultrasonic tight-coupling atomization and hot gas atomization.
Application: The atomization method is usually used in the production of Fe, Sn, Zn, Pb, Cu and other metal alloy powders, and can also be used in the production of bronze, brass, carbon steel, alloy steel and other alloy metal alloy powders. The atomization method meets the special requirements of metal alloy powder for 3D printing consumables. Figure 3 shows the microstructure of stainless steel metal alloy powder from a German manufacturer.
Advantages and disadvantages: Atomized metal alloy powder has the advantages of high sphericity, controllable metal alloy powder particle size, low oxygen content, low production cost and adaptability to the production of a variety of metal alloy powders. It has become the main development direction of high-performance and special alloy metal alloy powder preparation technology, but The atomization method has the disadvantages of low production efficiency, low yield of ultra-fine metal alloy powder, and relatively large energy consumption.


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