Tag: Metal powder

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    What are the main aerosol methods for producing metal alloy powders

    The gas atomization method is one of the main methods for producing metal alloy powders. The basic principle of gas atomization is the process of breaking the liquid metal stream into small droplets with high-speed airflow and solidifying into powder. Due to its advantages of high purity, low oxygen content, controllable powder particle size, low production cost and high sphericity, the prepared powder has become the main development direction of high-performance and special alloy powder preparation technology. At present, several representative gas atomization technologies for powder production are as follows:
    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 tightly coupled atomization technology

    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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    Water atomization is one of the important preparation methods for 3D printing metal powder

    technology allows for 3D printing. Its most notable advantage is the ability to generate parts in any shape directly from computer graphics data, without any machining and molds. This greatly reduces the product development cycle while increasing productivity and reducing costs. Metal powder, the main raw material in 3D printing of metal components, has caught people's interest. 3D Printing Metal Powder is the most valuable and important part of 3D Printing Industry Chain of metal parts.

    Metal powder preparation

    The metal powder preparation processes can currently be divided into reduction method (also known as a reduction process), electrolysis method (also known as a carbonyl decomposition technique), grinding method (also called atomization), etc. The preparation process determines the type of metal powder. In the powder metallurgy sector, powders produced by reduction and electrolysis are the most commonly used raw materials. Modern atomization methods can also be used to control the shape and size of the powder. The development of the atomization cavities has greatly improved the efficiency of atomization, making the atomization technique the most popular method to produce powder. The atomization technique meets the specific requirements of 3D printed consumable metals powder. The atomization process is a way to mechanically reduce molten metal particles down to less than 150mm.

    Water atomization

    The water atomization process is an inexpensive method for producing powder. The atomization media water is cheap and easy to get, but it also provides excellent atomization. The domestic water atomization technique is used primarily to produce steel, matrix powder for diamond tooling, pre-alloys powder for oil-bearing rollers, powders for hard-surface technology, and iron and nickel-based magnet powders. The specific heat of water being much greater than the gas's, it is possible that the metal droplets will solidify and become irregular during the atomization. Water will react with other metals or alloys that have a high level of activity. In addition, contact with the water during the atomization will increase the amount of oxygen in the powder. This limits the use of water atomization for metal powders of high sphericity with low oxygen contents.

    (aka. Technology Co. Ltd., a trusted global chemical supplier and manufacturer of high-quality Nanomaterials with more than 12 year's experience in the field. Metal Powder is produced by our company with high purity, fine particles and low impurity levels. Contact us if you need to.

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