Plasma Rotating Electrode Process (PREP) Technologies and System

Shanghai Truer Industrial Development Co., Ltd

introduction of Metal powder making equipment: Plasma Rotating Electrode Process (PREP) System

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    What Is Plasma Rotating Electrode Process (PREP) System?

    The high-speed rotating electrode (raw material) is melted by the plasma arc under the protection of the high purity inert atmosphere, and the molten metal is thrown out by big centrifugal force to be atomised by the inert atmosphere and condensed into spherical powders when contacting to the internal wall of the cold chamber.

    copper alloy powder

    Characteristics Of PREPed Metal Powders:

    • Low increment of oxygen and other impurities (high purity)
    • Perfectly spherical and essentially satellite-free
    • Narrow particle size distribution, high flowability and high apparent/packing density
    • Low internal porosity

    Which metal powders can be produced by PREP System?

    PREP plasma rotary electrode atomization metal powder making equipment is mainly used to produce nickel-based high-temperature alloy powder, titanium alloy powder, stainless steel powder, and refractory metal powder, etc. The powder produced is of high quality and is widely used in electron beam selective melting, laser melting deposition, spraying, hot isostatic pressing, and other fields.

    The metal or alloy is made into self-consuming electrode bar stock, and the end face of the electrode rotating at high speed is melted by plasma arc, and the centrifugal force generated by the electrode rotating at high speed throws out the melted metal liquid to form small droplets, which are cooled at high speed in the inert gas and solidified into spherical powder particles.

    Metal Powder characteristics:

    • High-quality powder, smooth and clean surface of powder particles, very little hollow powder and satellite powder, little gas inclusions;
    • Simple control of process parameters, easy operation, and automatic production;
    • Strong applicability, can prepare Ti, Ni, Co refractory metals and alloys.

    Typical Metal Powder Preparation Technologies

    Powder Making Process






    Raw Material

    Elemental materials, ingots, bars, etc.

    Precision machined bars

    Precision machined bars

    Wire material

    Irregular powders

    Powder Particle Size Distribution

    Wide particle size distribution, certain percentage of fine powders (-325 mesh)

    Wide particle size distribution, certain percentage of fine powders

    Narrow particle size distribution and low percentage of fine powders

    Wide particle size distribution, higher percentage of fine powders than VIGA and EIGA

    Highly related to the raw powders, certain percentage of fine powders


    about 100kg/8h

    about 100kg/8h




    Powder Morphology

    Nearly spherical, Sphericity>80%

    Nearly spherical, Sphericity>80%

    Spherical, sphericiy>90%

    Spherical, sphericity>85%

    Spherical, sphercity>85%

    Powder Characteristics

    Certain percentage of satellite and porous powders with a slightly higher oxygen content

    Certain percentage of satellite and porous powders with a slightly higher oxygen content

    Fewer satellite and porous powders, lowest oxygen content

    Small amounts of satellite and porous powders, slightly higher oxygen content

    Very small amounts of satellite and porous powders with high oxygen content


    Contamination by impurities

    Large gas consumption

    Low percentage of fine powders

    Raw materials for filaments

    Raw powders


    Where to buy Metal Powder Making Equipment: Plasma Rotating Electrode Process (PREP) System?


    These compact PREP systems SLPA-D are purposely designed for the R&D of novel alloy powders and small batch production of high-quality powders.

    Target groups:

    Scientific research, experiment, development, and production of high-quality spherical metal powder in universities and research institutes (especially suitable for the development of new materials)


    Featured by an innovative dynamic sealing structure, which provides strong support for the high-speed rotation and high-precision feeding of the electrode bar and consistent pressure in the atomizing chamber.

    High-quality and large-scale industrial production of spherical powder users, users can carry out mass production of additive manufacturing, high-end powder metallurgy, laser cladding.

    about us

    Truer Industry

    shanghai truer am-material

    Shanghai Truer Industrial Development Co., Ltd. was established in 2009 and created the additive manufacturing business in 2019, which is dedicated to building integrating 3D printing powder making equipment and services, high quality 3D printing powders to help engineering applications of additive manufacturing.

    The company not only provides professional selective electron beam melting (SEBM) technology and equipment, but also plasma rotating electrode process powder making (PREP) technology and equipment. We also have various grades of spherical metal powders, including TiNi, TiTa, TiAl, TiNbZr, CoCrMo and so on.

    truer certificate

    Send Us A Message

    Contact us


    Cassiel Ding
    +86 – 13611869448 [email protected]

    Sales Manager

    Lucy Wen
    +86 – 15250232891
    [email protected]

    Quality Control

    Mike Wu
    +86 – 13862291355 [email protected]


    Joan Zhou
    +86 – 17316565943 [email protected]

    Customer Service

    Luke Zhang
    +86 – 15250014048 [email protected]

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