Atomization technique for producing fine particles

• US 7,131,597 B2
• Filed: 09/09/2003
• Issued: 11/07/2006
• Est. Priority Date: 09/09/2003
• Status: Expired due to Fees

• Current Assignee: John R. Scattergood
• Original Assignee: John R. Scattergood
• Inventors: Scattergood, John R.
• Primary Examiner(s): Nguyen, Dinh Q.
• Application Number:
  US10/658,250
• Publication Number:
  US 20050050993A1
• Time in Patent Office: 1,155 Days
• Field of Search: 239/110, 239/224, 239/8, 239/9, 239/10, 239/398, 753/33, 753/35, 753/34, 753/38, 219/121.5, 264/8
• US Class Current: 239/8
• CPC Class Codes: B22F 2009/084 combination of methods
• CPC Class Codes: B22F 9/082 atomising using a fluid using centrifugal force B22F9/10
• CPC Class Codes: B22F 9/10 using centrifugal force

Abstract

This disclosure relates to a novel process for atomizing a liquid material or a mixture of liquid materials. More specifically, this disclosure advances the art by utilizing the inertial forces created in an elevated acceleration environment to further miniaturize and enhance the characteristics of particles resulting from atomization. The key to this disclosure is to subject a melt material to an elevated acceleration and pass a fluid over the surface of the melt. The purpose of the elevated acceleration is to elevate the relative importance of gravitational forces in the melt thus miniaturizing any gravity influenced disturbance. This elevated acceleration environment leads to miniaturization of gravitationally dependent phenomena thus leading to smaller particle creation. The purpose of the atomizing fluid is to impart kinetic energy onto the melt thereby causing disturbances and to act as a heat transfer media to cool the particles. In other words, this disclosure teaches not only utilizing bursting bubbles, surface waves, and splashes to create fine particles by purposely introducing gas flow on the liquid material(s) to be atomized but further enhancing the process by facilitating that these material(s) are simultaneously at elevated acceleration. The novel aspects of this disclosure significantly enhance the physical characteristics of the resulting particles, by allowing smaller particles to be produced, by cooling the particles more rapidly and by reducing contamination threats by avoiding physical contact between the material(s) being atomized and any refractive materials.

Claims

1. An atomizer system comprising:

a melt material to be atomized;

a containment portion for securing the melt material;

a unit which accelerates the melt material such that the melt material experiences an acceleration force higher than Earth'"'"'s standard gravitational force; and

atomizing fluid that flows across an exposed surface of the melt material, the exposed surface of the melt material being located within the containment portion;

wherein the containment portion and the unit which accelerates the melt material are operative to prevent the melt material from being ejected from the containment portion due to the acceleration force; and

wherein, while the melt material is experiencing the acceleration force, liquid droplets of the melt material become entrained in the atomizing fluid flowing across the exposed surface of the material such that at least some of the liquid droplets aerosolize and are ejected from the containment portion.

2. The atomizer system of claim 1 further comprising means for introducing relative motion between the containment portion and the melt material.

3. The atomizer system of claim 1 wherein the melt material is rotated about more than one axis.

4. The atomizer system of claim 1 wherein the melt material is introduced into the containment portion as a liquid as the containment portion is being moved by the unit which accelerates the melt material.

5. The atomizer system of claim 1 wherein the unit accelerating the melt material is a centrifuge.

6. The atomizer system of claim 1 further comprising a source of vibration to introduce disturbances within the melt material.

7. The atomizer system of claim 1 wherein the flow of atomization fluid is continuous.

8. The atomizer system of claim 1 wherein the containment portion is made of a solid form of the melt material itself.

9. The atomizer system of claim 1 wherein the atomizing fluid is a gas.

10. The atomizer system of claim 9 wherein the gas that is the atomizing fluid is inert.

11. The atomizer system of claim 9 wherein the gas that is the atomizing fluid is oxidizing.

12. The atomizer system of claim 9 wherein the gas that is the atomizing fluid is reducing.

13. The atomizer system of claim 1 wherein the atomizing fluid is a liquid.

14. The atomizer system of claim 13 wherein the liquid that is the atomizing fluid is inert.

15. The atomizer system of claim 13 wherein the liquid that is the atomizing fluid is oxidizing.

16. The atomizer system of claim 13 wherein the liquid that is the atomizing fluid is reducing.

17. The atomizer system of claim 1 wherein the atomizing fluid contains particulates therein.

18. The atomizer system of claim 1 wherein the thermodynamic conditions, i.e. temperature, pressure, and density, as well as velocity (axial and angular) of the atomizing fluid are user selectable.

19. The atomizer system of claim 1 further comprising a cooling system.

20. The atomizer system of claim 1 further comprising a liquefying system that liquefies the melt material prior to introducing the melt material to the containment portion.

21. The atomizer system of claim 20 wherein the liquefying system applies radiant heating to the melt material to be atomized.

22. The atomizer system of claim 20 wherein the liquefying system applies induction heating to the melt material to be atomized.

23. The atomizer system of claim 20 wherein the liquefying system applies electric arc heating to the melt material to be atomized.

24. The atomizer system of claim 20 wherein the liquefying system applies lasers to the melt material to be atomized.

25. The atomizer system of claim 20 wherein the liquefying system applies hot atomizing fluid heating to the melt material to be atomized.

26. The atomizer system of claim 20 wherein the liquefying system applies chemical reaction heating to the melt material to be atomized.

27. The atomizer system of claim 20 wherein the liquefying system applies refractory containment heating to the melt material to be atomized.

28. The atomizer system of claim 20 wherein the liquefying system applies plasma arc heating to the melt material to be atomized.

29. The atomizing system of claim 1 wherein, while the melt material is experiencing the acceleration forces, portions of the atomizing fluid become entrapped within the melt material such that the portions of the atomizing fluid within the melt material buoyantly travel to the exposed surface of the melt material and form at least some of the liquid droplets of the melt material.

30. The atomizing system of claim 1 wherein the atomizing fluid that entrains the liquid droplets of the melt material flows in a direction substantially parallel to an axis of rotation of the containment portion.

31. The atomizing system of claim 30 wherein the containment portion is a cylinder.

32. A method of atomizing a melt material comprising the steps of:

accelerating the melt material to be atomized;

flowing an atomizing fluid across an exposed surface of the melt material while the exposed surface of the melt material is experiencing an acceleration force higher than Earth'"'"'s standard gravitational force; and

while the exposed surface of the melt material is experiencing the acceleration force, entraining liquid droplets of the melt material in the atomizing fluid flowing across the exposed surface of the melt material such that the liquid droplets aerosolize and create fine particulates;

wherein the atomizing fluid contains particulates therein.

33. A method of atomizing a melt material comprising the steps of:

accelerating the melt material to be atomized;

flowing an atomizing fluid across an exposed surface of the melt material while the exposed surface of the melt material is experiencing an acceleration force higher than Earth'"'"'s standard gravitational force;

while the exposed surface of the melt material is experiencing the acceleration force, entraining liquid droplets of the melt material in the atomizing fluid flowing across the exposed surface of the melt material such that the liquid droplets aerosolize and create fine particulates; and

entrapping portions of the atomizing fluid within the melt material such that, while the melt material is experiencing the acceleration forces, the portions of the atomizing fluid within the melt material buoyantly travel to the exposed surface of the melt material and form at least some of the liquid droplets.