Ammunition using non-toxic metals and binders

• US 6,551,375 B2
• Filed: 03/06/2001
• Issued: 04/22/2003
• Est. Priority Date: 03/06/2001
• Status: Expired due to Term

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: Siddle, David Richard, Dary, Francois-Charles Henri, Tauber, Joseph Matthew
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US09/800,167
• Publication Number:
  US 20030056620A1
• Time in Patent Office: 777 Days
• Field of Search: 419/65, 419/66, 752/30, 752/45, 752/48
• US Class Current: 75/248
• CPC Class Codes: B22F 1/00 Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
• CPC Class Codes: C22C 1/045 Alloys based on refractory metals
• CPC Class Codes: C22C 23/04 with zinc or cadmium as the next major constituent
• CPC Class Codes: C22C 27/04 Alloys based on tungsten or molybdenum
• CPC Class Codes: C22C 38/12 containing tungsten, tantalum, molybdenum, vanadium, or niobium
• CPC Class Codes: F42B 12/74 of the core or solid body
• CPC Class Codes: F42B 7/046 Pellets or shot therefor

Abstract

Tungsten powder is mixed with a second powder metal and a binder to be used as small arms projectiles and shot pellets for use in shot guns which is cost effective to produce and which can perform ballistically. Ballistic performance equal to or superior to that of lead would be offered by a material having a specific gravity equal to or greater than lead. The non-toxic projectiles are manufactured in a cost-effective process; yet still produces projectiles and shot pellets that can perform ballistically. This projectile composition can perform substantially as well as lead and lead alloys or better without the need to fabricate the composition from a high temperature molten state which requires large amounts of energy input. In one particular embodiment of the invention, the tungsten powder is blended with iron powder and Portland Cement for constructing projectiles. The tungsten, iron and Portland Cement (W/Fe Portland cement) shot provides a satisfactory substitute for lead shot.

Claims

1. A projectile having a specific gravity of at least about 10.00 gm/cc comprising:

less than 80% by volume tungsten and more than 10% by volume a second metal or metal alloy selected-from the group consisting of iron, tin, brass, pewter, bronze zinc and their mixtures and alloys; and

an inorganic binder,

wherein said tungsten and said second metal are blended powdered materials that are prepared by curing.

2. The projectile according to claim 1 wherein said projectile is a shot pellet.

3. The projectile according to claim 1 wherein said binder is Portland Cement.

4. The projectile according to claim 3 wherein said binder is at least 5% by volume.

5. The projectile according to claim 1 wherein said volume of tungsten is greater than 50%.

6. The projectile according to claim 1 wherein said volume of tungsten is about 40% tungsten.

7. The projectile according to claim 1 wherein said volume of tungsten is less than or about 21%.

8. The projectile according to claim 1 wherein said inorganic binder comprises at least 5% by volume of said projectile.

9. The projectile according to claim 1 wherein said binder comprises between 5%-20% by volume of said projectile.

10. The projectile according to claim 1 wherein said binder is about by volume 20% of said projectile.

11. The projectile according to claim 9 wherein said volume of tungsten is between 35%-45%.

12. The projectile according to claim 9 wherein said volume of tungsten is between 25-50%.

13. A projectile essentially consisting of;

a) tungsten

b) a second metal

c) a inorganic binder.

14. The projectile according to claim 13 wherein the inorganic binder is Portland cement.

15. A process for making a projectile comprising the steps of;

a) mixing together tungsten powder with second metal powder and an inorganic binder to form a blend;

b) compacting said blend;

c) adding water to said blend;

d) drying said blend to cure and strengthen said blend into said projectile.

16. The process for making a projectile according to claim 15 wherein said compacting step includes compacting said blend into a mold of desired shape and said drying step is performed at room temperature.

17. A material composition having a specific gravity of at least about 10.00 gm/cc comprising:

less than 80% volume tungsten and more than 10% by volume a second metal selected from the group consisting of iron, tin, brass, pewter, bronze, zinc and their mixtures and alloys; and

an inorganic binder,

wherein said tungsten and said second metal are blended powdered materials that are prepared by curing.

18. The material composition according to claim 17 wherein said binder is Portland Cement.

19. The material composition according to claim 17 wherein said volume of tungsten is about 40%.

20. The material composition according to claim 17 wherein said volume of tungsten is less than or equal to 21%.

21. The material composition according to claim 17 wherein said binder comprises between 5%-20% by volume of said composition.

22. A projectile having a specific gravity of at least about 9.00 gm/cc comprising:

less than 50% volume tungsten and more than 20% by volume iron; and

a Portland Cement binder that is by volume at least 5% of said projectile,

wherein said tungsten and said iron are blended powdered materials that are prepared by curing or drying.