Working principle of plasma rotate electrode process equipment: Metals or alloys are made into consumable electrodes as feedstock. Its end face is heated by plasma torch and melted into molten liquid, then the molten liquid is ejected by the centrifugal force of high-speed rotating electrode, crushed into small droplets and solidified into powders.
Application
Plasma rotate electrode process equipment can be used for producing various high temperature and high purity alloy powders, such as titanium and titanium alloy, nickel and nickel alloy, chromium and chromium alloy, special steel, especially can produce a variety of high entropy alloy, refractory alloy and other special materials. The powder prepared by PREP method has advantages of clean surface, high sphericity, few associated particles, no hollow nor satellite powder, good fluidity, high purity, low oxygen content, narrow particle size distribution, etc. Powder made by PREP technology is very suitable for the metal 3D printing industry.
Overview
Working principle of plasma rotate electrode process equipment: Metals or alloys are made into consumable electrodes as feedstock. Its end face is heated by plasma torch and melted into molten liquid, then the molten liquid is ejected by the centrifugal force of high-speed rotating electrode, crushed into small droplets and solidified into powders.
Advantages
Plasma rotate electrode process equipment can produce refractory metal powders such as nickel based superalloy, titanium alloy, and active metal powders. It can produce alloy powders such as stainless steel, cobalt, chrome as well.
Advantages of plasma rotate electrode process (PREP) technology:
① Since the raw material is not in contact with the crucible and the guide tube in melting process, no impurities are introduced in the melting process, and the material will not contaminated. PREP technology is suitable for manufacturing active material powder and refractory metal powder.
② Powder made by PREP technology is with regular shape, high spheroidization, smooth surface and good flowability.
③ Almost no satellite powder or hollow powder.
④ The performance consistency and stability of batch powder are good.
Main Functions
We can provide multi different capacities of plasma rotate electrode process equipment, and accept customization on special demands.
Technical Parameter
| Model | EFPREP-20 | EFPREP-80 |
| Diameter of electrode bar | ≤20mm | ≤80mm |
| Maximum rotation speed of electrode bar | ≤60000r/min | ≤40000r/min |
| Production capacity（Ni718） | 1-2KG/H | 4-8KG/H |
| Oxygen increasing | ≤300ppm | |
| Ultimate vacuum degree | < 10Pa（higher vacuum can be customized） | |
| Working gas | Helium / Argon | |
| Highest melting temperature | ≥2500℃ | |
| Power (KW) | 120 | 320 |
| Leakage | 5Pa/h | |
| Power supply | Three phases, 380V 50Hz | |
| Cooling water device | Air cooling tower, water cooling unit, heat exchanger | |
| Control mode | Industrial control computer or PLC | |
| Operation interface | Touch-tone or Touch-screen | |
| Data recording | 12 data curve records, LCD monitor display | |
Components
Plasma rotate electrode process equipment is composed of plasma gun system, raw material rod feeding system, charging system, control system, atomization tower, vacuum system, powder separation and collection system, water cooling system, electrical control system, etc.
Others
Plasma rotate electrode process technology (PREP method) uses prefabricated alloy rod as an electrode. The plasma will arc and melt the end of the high-speed rotating electrode rod, use the centrifugal force generated by the high-speed rotation of the electrode rod to atomize the molten metal into small droplets, atomized metal droplets condense into spherical powders.
From the working principle of plasma rotate electrode process technology, it can be seen that the advantage of PREP method is that material does not need to be melted in a crucible. It is a crucible less melting technology, which can reduce the doping of other metals or non-metallic impurities in the melting process, greatly improve purity of the final powder. Metal powder made by PREP has high sphericity and good fluidity. However, the yield of fine powder (0~45μm) is low, and this technology is mainly used to produce spherical powder with medium and coarse particle sizes.
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