Strong downstream demand for metal powder preparation Gas atomization technology empowers industry upgrades.
Advanced powder preparation technology is the foundation of modern powder metallurgy and product industrialization. It is an advanced manufacturing technology that integrates material preparation and parts forming, energy saving, material saving, high efficiency, starting, and less pollution. It is very suitable for mass production. Has an irreplaceable role in manufacturing materials and parts and has become a very active frontier field of material science and engineering technology research today.
The powder prepared by atomization has accounted for 80% of the total power in the world today, of which the powder prepared by gas atomization accounts for 30% to 50%, that is to say, nearly half of it is completed by gas atomization technology. The sphericity, particle size (powder diameter), particle size distribution concentration, metallization and density, and surface quality of the powder prepared by the atomization method are incomparable with the traditional chemical powder method.
Key technologies to realize the understanding and control of complex flow field evolution behavior
Atomization pulverizing technology is a widely used technology in the domestic manufacturing industry in additive manufacturing and magnetic materials. It is also essential for product quality upgrades and new product development.
As one of the main methods of producing metal and alloy powder, gas atomization is breaking the liquid metal stream into tiny droplets and solidifying it into powder by high-speed airflow. Because the powder prepared by it has the advantages of high purity, low oxygen content, controllable powder particle size, low production cost, and high sphericity, it has become the main development direction of high performance and unique alloy powder preparation technology.
Currently, several representative gas atomization technologies are laminar flow atomization technology, ultrasonic tightly coupled atomization technology, and the hot gas atomization method.
Laminar atomization technology is a significant improvement over conventional nozzles. The improved atomizing nozzle has high efficiency, narrow powder particle size distribution, fast cooling rate, low gas consumption, and substantial economic benefits. It is suitable for the production of most metal powders.
The ultrasonic close-coupled atomization technology optimizes the structure of the close-coupled annular slot nozzle so that the outlet velocity of the airflow exceeds the speed of sound and the mass flow rate of the metal is increased. When atomizing high surface energy metals such as stainless steel, the average particle size of the powder can reach Around 20μm, and the standard deviation of the powder can be reduced to 1.5μm. The cooling rate of the powder is greatly improved, and fast cooling or amorphous powder can be produced. It has excellent industrial practical significance and can be widely used in making fine stainless steel, iron alloys, nickel alloys, copper alloys, magnetic materials, hydrogen storage materials, and other alloy powders.
Compared with traditional atomization technology, hot gas atomization can improve atomization efficiency and reduce gas consumption. It is easy to realize the process on standard atomization equipment, and it is a technology with application prospects. However, hot gas atomization technology is limited by gas heating systems and nozzles, and only a few research institutions conduct research.
Widely used in many fields to help accelerate industrial chain development.
The complete set of gas atomization powder-making equipment is suitable for melting metals, ceramics, and other non-metallic or metal alloys (ordinary melting or vacuum melting can be used) and then making them into powder (or granular) material. According to the requirements of the milling process, the vacuum melting gas atomization method and the non-vacuum melting gas atomization method can be adopted.
The powder obtained by the gas atomization pulverizing equipment method for the manufacture of electrical contact raw materials has the following advantages: the powder particle size is small, the distribution is concentrated, and the fineness can reach 10btm (1250 mesh), which is conducive to the refinement of the material structure; metallization, spherical The melted powder has good fluidity, and the natural grain boundary can effectively inhibit the grain growth during the production and use of the material; the powder made by electromagnetic stirring through induction furnace melting has uniform alloy components and high density, which can ensure the product The quality of the metalized particles is not easy to agglomerate and stick, and the invisible loss is slight.
