Frangible, ceramic-metal composite objects and methods of making the same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F42B-012/74
B22F-003/12
출원번호
US-0252797
(2011-10-04)
등록번호
US-8468947
(2013-06-25)
발명자
/ 주소
Hash, Mark C.
Pearson, Trent
출원인 / 주소
Ervin Industries, Inc.
대리인 / 주소
Gifford, Krass, Sprinkle, Anderson & Citkowski, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
30
초록▼
In making frangible objects, including lead-free bullets and other projectiles, powdered metal primary and powdered ceramic secondary phases are mixed and densified at an elevated temperature such that the ceramic phase forms a brittle network. Any combination of metal and ceramic phases may be used
In making frangible objects, including lead-free bullets and other projectiles, powdered metal primary and powdered ceramic secondary phases are mixed and densified at an elevated temperature such that the ceramic phase forms a brittle network. Any combination of metal and ceramic phases may be used to achieve desired chemical and physical properties. Any appropriate mixing, forming, and/or thermal processing methods and equipment may be used. Degrees of frangibility, strength, and toughness can be adjusted to suit a given application by precursor selection, degree of mixing, relative amounts of metal and ceramic phases, forming method, and thermal and mechanical processing parameters.
대표청구항▼
1. A method of producing a frangible bullet, comprising the steps of: providing one or more metal powders;providing one or more ceramic powders;mixing the powders;pressing the powders into a bullet-shaped form;sintering the ceramic powder or powders at a temperature at or below the sintering tempera
1. A method of producing a frangible bullet, comprising the steps of: providing one or more metal powders;providing one or more ceramic powders;mixing the powders;pressing the powders into a bullet-shaped form;sintering the ceramic powder or powders at a temperature at or below the sintering temperature of the metal powder or powders to form a brittle network that shatters on impact with little or no deformation; andadjusting one or more of the following to produce a bullet for a particular application: metal powder chemistry or shape,ceramic powder chemistry or shape,degree of mixing of the powders,forming pressure,sintering time or temperature profile, andannealing, working or other thermal or mechanical treatments. 2. The method of claim 1, wherein the metal powder is copper powder. 3. The method of claim 1, wherein the ceramic powder is composed of a crystalline or amorphous material. 4. The method of claim 1, wherein the ceramic powder is a silica-based glass powder. 5. The method of claim 1, wherein the step of densifying the mixture includes uniaxially pressing the mixture into the form or green-body. 6. The method of claim 1, including the step of densifying the mixture into the bullet-shaped form includes pressurization on the order of 10,000 psi. 7. The method of claim 1, including the step of sintering the mixture in an inert atmosphere. 8. The method of claim 1, wherein the mixture is lead-free. 9. The method of claim 1, wherein one or both of the powders are milled. 10. The method of claim 1, further including the step of adjusting bulk density through subsequent mechanical or chemical treatments. 11. The method of claim 1, further including the step of hot or cold working following thermal processing. 12. The method of claim 1, further including the step of post-densification annealing to relieve or enhance residual stresses within the object. 13. A frangible bullet produced in accordance with the method of claim 1. 14. The method of claim 1, wherein the temperature is in the range of 1200-1700° F.
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이 특허에 인용된 특허 (30)
Dinkha Brian I. (Westminister CO) Jasa Paul B. (Denver CO) Seegmiller Brian (Arvada CO) Simmons Alden C. (Boulder CO), Ceramic munitions projectile.
Mravic Brian (North Haven CT) Mahulikar Deepak (Madison CT) Violette Gerald N. (New Haven CT) Shapiro Eugene (Hamden CT) Halverson Henry J. (Collinsville IL), Lead-free bullett.
Skaggs Samuel R. (Rte. 11 ; Box 81E Santa Fe NM 87501) Folsom Mark F. (25747 Carmel Knolls Dr. Carmel CA 92923), Reactive ballistic protection devices.
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