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Laminar flow atomization technology
Laminar atomization technology was proposed by a German company, etc. This technology has made significant improvements to conventional nozzles. The improved atomizing nozzle has high atomization efficiency, narrow powder particle size distribution, and cooling speed of 106-107K/s. Under the atomization pressure of 2.0MPa, the copper, aluminum, 316L stainless steel, etc. are atomized with Ar or N2 as the medium, and the average particle size of the powder reaches 10mm. The advantages of this process are low gas consumption, significant economic benefits, and it is suitable for the production of most metal powders. The disadvantage is that the technical control is difficult, the atomization process is unstable, and the output is small (the metal mass flow rate is less than 1kg/min), which is not conducive to industrial production.
Ultrasonic close-coupled atomization technology optimizes the structure of the close-coupled ring-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 metals with high surface energy such as stainless steel, the average particle size of the powder can reach about 20mm, and the standard deviation of the powder can be as low as 1.5mm.
A major advantage of this technology is that it greatly increases the cooling rate of the powder, and can produce fast cooling or amorphous powder. From the current development point of view, this technical equipment represents the new development direction of tightly coupled atomization technology, and has industrial practical significance, and can be widely used in micro stainless steel, iron alloy, nickel alloy, copper alloy, magnetic materials, hydrogen storage Production of alloy powders such as materials.
Hot gas atomization
In recent years, a company in the United States has conducted a lot of research on the effect and mechanism of hot gas atomization. A company in the United States heated the gas to 200-400degC to atomize silver alloy and gold alloy under the pressure of 1.72MPa and found that the average particle size and standard deviation of the powder decreased with the increase of temperature. Compared with traditional atomization technology, hot gas atomization technology can improve atomization efficiency, reduce gas consumption, and is easy to implement process on traditional atomization equipment. It is a technology with promising applications.
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