US4498395A
Expired / Lapsed
US
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Powder comprising coated tungsten grains
Assignee: Dornier System GmbH
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Filing: 1983-07-06
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Granted: 1985-02-12
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Expires: 2003-07-06
Abstract
Abstract A heterogenous powder comprising particles of tungsten grains with a diameter of less than 1 μm with a binder sponge-like coating of at least one metal selected from the group consisting of nickel, copper, silver, iron, cobalt, molybdenum and rhenium with a particle diameter of 10 to 50 μm, a process for the preparation thereof, method of forming sintered elements therefrom and the elements produced thereby being useful as penetrating projectiles.
Inventors
- 👤 Wulf Kock
- 👤 Rainer Schmidberger
- 👤 Wolfgang Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:32
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/05; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/059; C22C27/00; C22C27/04; F; F42; F42B; F42B12/00; F42B12/02; F42B12/04; F42B12/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
49 words
A heterogeneous powder comprising particles of tungsten grains with a diameter of less than 1 μm with a binder sponge-like coating of at least one metal selected from the group consisting of nickel, copper, silver, iron, cobalt, molybdenum and rhenium with a particle diameter of 10 to 50 μm.
Claim 2
Dependent Claim
49 words
A heterogeneous powder comprising particles of tungsten grains with a diameter of less than 1 μm with a binder sponge-like coating of at least one metal selected from the group consisting of nickel, copper, silver, iron, cobalt, molybdenum and rhenium with a particle diameter of 10 to 50 μm.
Claim 3
Dependent Claim
18 words
A powder of claim 1 wherein the tungsten is about 80 to 95% by weight of the particles.
Claim 4
Dependent Claim
16 words
A powder of claim 1 wherein the tungsten is about 90% by weight of the particles.
Claim 5
Dependent Claim
15 words
A powder of claim 1 wherein the binder coating is made of iron and nickel.
Claim 6
Dependent Claim
15 words
A powder of claim 1 wherein the binder coating is made of nickel and copper.
Claim 7
Dependent Claim
16 words
A powder of claim 1 wherein the binder coating is made of nickel, cobalt and iron.
Claim 8
Dependent Claim
23 words
A powder of claim 1 wherein the binder coating is made of nickel, cobalt and iron in a weight ratio of about 3:1:1.
Claim 9
Dependent Claim
15 words
A powder of claim 1 wherein the binder coating is made of copper or silver.
Claim 10
Dependent Claim
103 words
A process for the preparation of a heterogeneous powder of claim 1 comprising forming a solution of a tungsten salt and the matrix metal salts, forming a spray of the said solution with a mean droplet diameter of less than 50 μm at elevated temperatures and a reducing atmosphere to form sponge-like mixed metal oxide particles with a mean diameter of about 10 to 50 μm, separating the gaseous evaporation products and reducing the particles free falling in an upwardly passing hydrogen current at 950° to 1200° C. to obtain the sponge-like metal powder with a mean diameter of 10 to 50 μm.
Claim 11
Dependent Claim
14 words
The process of claim 9 wherein the evaporation is effected at about 800° C.
Claim 12
Dependent Claim
19 words
The process of claim 9 wherein the particles and the gaseous evaporation products are separated at about 400° C.
Claim 13
Dependent Claim
15 words
The process of claim 9 wherein the reduction is effected at 950° to 1200° C.
Claim 14
Dependent Claim
12 words
The process of claim 9 wherein the reduction step is performed separately.
Claim 15
Dependent Claim
38 words
The process of claim 9 wherein an ammoniacal solution of tungstic acid or its anhydride or a salt thereof is admixed with a solution of a salt of the binder metal in the form of an ammine complex.
Claim 16
Dependent Claim
17 words
The process of claim 14 wherein the salt of the binder metal is complexed with ethylenediaminetetraacetic acid.
Claim 17
Dependent Claim
15 words
The process of claim 9 wherein the mean droplet spectrum is 30 to 50 μm.
Claim 18
Dependent Claim
42 words
The process of claim 9 wherein the tungsten salt is ammoniummetatungstenate-(NH 4 ) 6 H 2 W 12 O 40 . XH 2 O- and if iron is used as a binder surpowent it is added as a salt of bevalent iron.
Claim 19
Dependent Claim
79 words
A method of forming sintered elements comprising compressing the heterogeneous powders of claim 1 to form a compact of the desired shape with a high green density and sintering the compact at 600° to 1300° C. in a reducing atmosphere and degassing the sintered body whose structure is pore free and consists of polygonal tungsten grains with a mean diameter less than 5 μm which substantially occupy all the space therein with a thin layer of binder between them.
Claim 20
Dependent Claim
18 words
The method of claim 18 wherein the tungsten is about 80 to 95% by weight of the particles.
Claim 21
Dependent Claim
16 words
The method of claim 18 wherein the tungsten is about 90% by weight of the particles.
Claim 22
Dependent Claim
15 words
The method of claim 18 wherein the binder coating is made of iron and nickel.
Claim 23
Dependent Claim
15 words
The method of claim 18 wherein the binder coating is made of nickel and copper.
Claim 24
Dependent Claim
16 words
The method of claim 18 wherein the binder coating is made of nickel, cobalt and iron.
Claim 25
Dependent Claim
22 words
The method of claim 18 wherein the binder coating is made nickel, cobalt and iron in a weight ratio of about 3:1:1.
Claim 26
Dependent Claim
15 words
A powder of claim 18 wherein the binder coating is made of copper or silver.
Claim 27
Dependent Claim
14 words
A penetration projectile made of the material produced by the process of claim 22.
Claim 28
Dependent Claim
17 words
The projectile of claim 26 wherein the weight ratio of nickel, cobalt and iron is about 3:1:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |