US4876941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite for protection against armor-piercing projectiles
Assignee: Eltech Systems Corp
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Filing: 1987-12-31
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Granted: 1989-10-31
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Expires: 2007-12-31
Abstract
Abstract A composite for protection against armor-piercing projectiles is disclosed. The composite can be a ceramic composite which may be utilized alone or with other materials, e.g., a metallic or plastic base or substrate layer. Composites of AlN with TiB 2 , SiC, B 4 C or their mixtures are utilized. These ceramic composites can be prepared by hot pressing, reaction hot pressing, hot isostatic pressing or pressureless sintering. The composite may have well dispersed grains for at least one component, which grains can be interconnected with grains of the second component, and the grains may be of a size less than about five microns. The composite in layer form can have a metallic cover layer.
Inventors
- 👤 Albert L. Barnes
- 👤 Thomas M. Clere
- 👤 Gholamreza J. Abbaschian
- 👤 Douglas J. Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/581; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/003; C04B37/006; C04B37/02; C04B37/021; C04B37/023; C04B37/026; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0414; F41H5/0421; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/365; C04B2237/38; C04B2237/40; C04B2237/402; C04B2237/403; C04B2237/405; C04B2237/406; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31953
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
47 words
An armor plate layered composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a metal substrate and a surface layer composite ceramic on said substrate of very finely-divided and interconnected grains of TiB 2 and AlN.
Claim 2
Dependent Claim
47 words
An armor plate layered composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a metal substrate and a surface layer composite ceramic on said substrate of very finely-divided and interconnected grains of TiB 2 and AlN.
Claim 3
Dependent Claim
22 words
The armor plate of claim 1, wherein said metal substrate comprises one or more of an elemental metal, alloy or intermetallic mixture.
Claim 4
Dependent Claim
28 words
The armor plate of claim 1, wherein said metal substrate comprises a metal selected from the group consisting of steel, aluminum, titanium and alloys and intermetallic mixtures thereof.
Claim 5
Dependent Claim
25 words
The armor plate of claim 1, wherein said surface layer ceramic contains from 10 to 90 weight percent TiB 2 and a balance of AlN.
Claim 6
Dependent Claim
37 words
The armor plate of claim 1, wherein said ceramic layer of interconnected grains of TiB 2 and AlN is prepared by one or more of conventional hot pressing, reaction hot pressing, hot isostatic pressing or pressureless sintering.
Claim 7
Dependent Claim
34 words
The armor plate of claim 1, wherein said metal substrate and ceramic surface layer are secured together by one or more of adhesive bonding, diffusion bonding, mechanical fastening, brazing, welding, soldering or combinations thereof.
Claim 8
Dependent Claim
34 words
The armor plate of claim 1, wherein said metal substrate and said composite ceramic are present together in a thickness having a ratio of metal to ceramic of from about 1:1 to about 6:1.
Claim 9
Dependent Claim
18 words
The armor plate of claim 1, wherein said plate is a multi-layer plate of greater than two layers.
Claim 10
Dependent Claim
18 words
The armor plate of claim 8, wherein said ceramic surface layer has a metal cover layer over same.
Claim 11
Dependent Claim
20 words
The armor plate of claim 1, wherein said ceramic has a density of at least 95 percent of theoretical density.
Claim 12
Dependent Claim
45 words
The armor plate of claim 1, wherein said ceramic has a microstructure comprising interconnected grains, of a grain size less than about five microns, the grains being of a TiB 2 reaction product, the grains of which are interconnected in grains of AlN reaction product.
Claim 13
Dependent Claim
35 words
The armor plate of claim 1, wherein said ceramic has a microstructure of interconnected reaction product grains in mixture with particulate ceramic diluent of one or more of TiB 2 , AlN or their mixtures.
Claim 14
Dependent Claim
15 words
The armor plate of claim 12, wherein said particulate ceramic diluent is in fiber form.
Claim 15
Dependent Claim
64 words
An armor plate layered composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a metal substrate and a surface layer composite ceramic on said substrate of AlN in mixture with one or more of TiB 2 , SiC or B 4 C, with said surface layer having very finely-divided and interconnected ceramic grains.
Claim 16
Dependent Claim
64 words
An armor plate layered composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a metal substrate and a surface layer composite ceramic on said substrate of AlN in mixture with one or more of TiB 2 , SiC or B 4 C, with said surface layer having very finely-divided and interconnected ceramic grains.
Claim 17
Dependent Claim
22 words
The armor plate of claim 14, wherein said metal substrate comprises one or more of an elemental metal, alloy or intermetallic mixture.
Claim 18
Dependent Claim
28 words
The armor plate of claim 14, wherein said metal substrate comprises a metal selected from the group consisting of steel, aluminum, titanium and alloys and intermetallic mixtures thereof.
Claim 19
Dependent Claim
33 words
The armor plate of claim 14, wherein said ceramic layer of interconnected ceramic grains is prepared by one or more of conventional hot pressing, reaction hot pressing, hot isostatic pressing or pressureless sintering.
Claim 20
Dependent Claim
34 words
The armor plate of claim 14, wherein said metal substrate and ceramic surface layer are secured together by one or more of adhesive bonding, diffusion bonding, mechanical fastening, brazing, welding, soldering or combinations thereof.
Claim 21
Dependent Claim
34 words
The armor plate of claim 14, wherein said metal substrate and said composite ceramic are present together in a thickness having a ratio of metal to ceramic of from about 1:1 to about 6:1.
Claim 22
Dependent Claim
18 words
The armor plate of claim 14, wherein said plate is a multi-layer plate of greater than two layers.
Claim 23
Dependent Claim
18 words
The armor plate of claim 20, wherein said ceramic surface layer has a metal cover layer over same.
Claim 24
Dependent Claim
24 words
The armor plate of claim 14, wherein said ceramic has a microstructure comprising interconnected grains of a grain size less than about five microns.
Claim 25
Dependent Claim
39 words
The armor plate of claim 14, wherein said ceramic has a microstructure comprising interconnected reaction product grains in mixture with particulate ceramic diluent of one or more of TiB 2 , AlN, SiC, B 4 C or their mixtures.
Claim 26
Dependent Claim
15 words
The armor plate of claim 23, wherein said particulate ceramic diluent is in fiber form.
Claim 27
Dependent Claim
37 words
An armor plate composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a composite ceramic of very finely-divided and interconnected grains of TiB 2 and AlN.
Claim 28
Dependent Claim
37 words
An armor plate composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a composite ceramic of very finely-divided and interconnected grains of TiB 2 and AlN.
Claim 29
Dependent Claim
25 words
The armor plate of claim 25, wherein said composite ceramic is in association in said plate with one or more of a metal or plastic.
Claim 30
Dependent Claim
18 words
The armor plate of claim 25, wherein said ceramic composite is utilized in association with a spall cover.
Claim 31
Dependent Claim
24 words
The armor plate of claim 25, wherein said ceramic composite forms a part of an assembly which includes material in fibrous or woven form.
Claim 32
Dependent Claim
49 words
An armor plate composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a composite ceramic of very finely-divided and interconnected grains of AlN in mixture with one or more of SiC, B 4 C or TiB 2 .
Claim 33
Dependent Claim
49 words
An armor plate composite for protection against projectiles and having enhanced resistance to penetration from high kinetic energy projectiles, which armor plate comprises a composite ceramic of very finely-divided and interconnected grains of AlN in mixture with one or more of SiC, B 4 C or TiB 2 .
Claim 34
Dependent Claim
25 words
The armor plate of claim 29, wherein said composite ceramic is in association in said plate with one or more of a metal or plastic.
Claim 35
Dependent Claim
18 words
The armor plate of claim 29, wherein said ceramic composite is utilized in association with a spall cover.
Claim 36
Dependent Claim
24 words
The armor plate of claim 29, wherein said ceramic composite forms a part of an assembly which includes material in fibrous or woven form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |