Method and apparatus for producing high purity spherical metallic powders at high production rates from one or two wires
A wire and equipment technology, applied in the field of metal powder production, can solve problems such as corners and irregularities
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example 1
[0048] Example 1: Twin Wire Arc Plasma Atomization (Primary Implementation)
[0049] Details of the main implementation will now be described.
[0050] In Table 1 the benefits of using this embodiment over known techniques (ref. 2) are presented. It shows a clear advantage in favor of using the current subject matter compared to using the technique of ref.
[0051] Table 1:
[0052] Key Specifications (for Ti64) Prior Art (Reference 2) this invention Production rate(kg / h) 5 28 Gas-Metal Ratio 26 5.5 Stop to start time (hours) 2 0.5 Specific power of Ti64 (kWh / kg) 31.2 4 Thermal efficiency(%) 1.11 8.75
[0053] Recommended operating conditions for the main embodiment are disclosed in Table 2 for two materials, Ti64 Grade 23 and Zirconium.
[0054] Table 2:
[0055] Material Ti-6Al-4V Gr 23 zirconium run# TA-015 ZH-006 Production rate(kg / h) 28 23.7 Torch power (kW) 90 94 Plasma gas...
example 2
[0077] Example 2: Single-Wire Arc Plasma Atomization
[0078] exist Figure 9 In the second example shown, there is also disclosed an apparatus A' for the production of metal powder from conductive wire stock, wherein the wire 405 is fed centrally along arrow 409 to a transfer plasma equipped with a supersonic nozzle 411 In front of a body torch 401 where an arc 403 is formed between a wire 405 and one electrode 402 . By inserting the electrically conductive wire 405 through the wire guide 407 to the front of the plasma torch 401, the wire 405 itself can be melted very efficiently by the diverted arc. The remaining energy will then be used to heat the inert gas (eg argon) fed via the preheated gas channel 404 into a plasma state, which is then accelerated through the supersonic nozzle 411 . This acceleration of the carrier gas further atomizes the metal droplets by shredding them. The particles are then cooled, for example, in a cooling chamber filled with an inert gas such...
example 3
[0079] Example 3: Centrally fed single-wire arc plasma atomization
[0080] exist Figure 10 In the third example shown, there is also disclosed an apparatus A" for the production of metal powder from conductive wire stock, wherein the wire 110 is fed centrally along arrow 111 into a plasma torch 112, here used as a cathode An arc 128 is formed between the wire 110 of the plasma torch 112 and an electrode (see anode 114). By inserting the conductive wire 110 through the wire guide 116 of the plasma torch 112, the wire 110 itself can be melted very efficiently by the diverted arc. From This method was chosen for the scaling up function in the sense that it would be most feasible to replace the wire with a rod or billet as large as 2.5 inches in diameter. The wire guide 116 can double as the ignition cathode. Then, The remaining energy is used to heat an inert gas (such as argon) fed through the preheated gas channel 118 to the plasma state, which is then accelerated through the ...
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Abstract
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