High melting point metal or alloy powders atomization manufacturing processes
There are provided high melting point metal or alloy powder atomization manufacturing processes comprising providing a melt of the high melting point metal or alloy through a feed tube; diverting the melt at a diverting angle with respect to a central axis of the feed tube to obtain a diverted melt; directing the diverted melt to an atomization area; and providing at least one atomization gas stream to the atomization area. The atomization process can be carried out in the presence of water within an atomization chamber used for the atomization process.
1. An atomization process for manufacturing a metal powder or an alloy powder having a melting point of 500° Celsius to 1800° Celsius, comprising:
providing a melt of said point metal or alloy through a feed tube;
delivering said melt through a diverter to an atomization area;
providing at least one atomization gas stream to the atomization area;
delivering water to an atomization chamber used for said atomization process, wherein, prior to being delivered to the atomization area, the melt is diverted in the diverter at a diverting angle of 10 to less than 90 degrees with respect to a central axis of the feed tube;
wherein the at least one atomization gas is delivered to an atomization head through at least two gas inlets, the at least two gas inlets to the atomization head are offset versus the central axis of the feed tube, creating a dynamic rotational effect around a central axis in the atomization area.
2. The process of claim 1 , wherein the at least one atomization gas stream is provided at average gas velocity of at least 300 m/s.
3. The process of claim 1 , wherein the diverting angle is 30 to 70 degrees.
4. The process of claim 1 , wherein the diverting angle is 40 to less than 90 degrees.
5. The process of claim 1 , wherein the process comprises providing the metal having said melting point of 500° Celsius to 1800° Celsius.
6. The process of claim 5 , wherein a ratio of the at least one atomization gas to the metal in the atomization area is 15 000 to 30 000 cm 3 of gas per cm 3 of the metal to be atomized.
7. The process of claim 5 , wherein a ratio of the at least one atomization gas to the metal in the atomization area is 5 000 to 40 000 cm 3 of gas per cm 3 of the metal to be atomized.
8. The process of claim 1 , wherein the metal is an element chosen from Al, Fe, Ni, Co, Cr, Mn, Ti, Ag, Cu, Mo, Pt, Pd, Au and Sn.
9. The process of claim 5 , wherein the metal is Cu.
10. The process of claim 1 , wherein the process comprises providing the alloy having said melting point of 500° Celsius to 1800° Celsius.
11. The process of claim 10 , wherein the alloy has a liquidus temperature of 500° Celsius to 1500° Celsius.
12. The process of claim 10 , wherein a ratio of at least one atomization gas to the alloy is 15 000 to 30 000 cm 3 of gas per cm 3 of the alloy to be atomized.
13. The process of claim 10 , wherein the alloy comprises at least one element chosen from Al, Fe, Ni, Co, Cr, Mn, Si, Ti, Ag, Cu, Mo, Pt, Pd, Au and Sn.
14. The process of claim 10 , wherein the alloy comprises Cu and Sn.
15. The process of claim 1 , wherein the at least one atomization gas stream has a velocity of 300 m/s to 700 m/s.
16. The process of claim 1 , wherein the at least one atomization gas stream has a velocity of 450 m/s to 600 m/s.
17. The process of claim 1 , wherein at least two gas inlets to the atomization head are offset versus the central axis of the feed tube, creating the dynamic rotational effect around the central axis in the atomization area.
18. The process of claim 1 , wherein an atomization chamber comprises 0% to 20% of oxygen.
19. The process of claim 1 , thereby providing the powder having an average particle size of 10 μm to 50 μm.