EP1118832A2 - Verfahren zur Innenbeschichtung eines Waffenrohres - Google Patents
Verfahren zur Innenbeschichtung eines Waffenrohres Download PDFInfo
- Publication number
- EP1118832A2 EP1118832A2 EP00126825A EP00126825A EP1118832A2 EP 1118832 A2 EP1118832 A2 EP 1118832A2 EP 00126825 A EP00126825 A EP 00126825A EP 00126825 A EP00126825 A EP 00126825A EP 1118832 A2 EP1118832 A2 EP 1118832A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chrome
- layers
- deposited
- partial
- chrome layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011248 coating agent Substances 0.000 title claims description 5
- 238000000576 coating method Methods 0.000 title claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 58
- 230000012010 growth Effects 0.000 claims abstract description 14
- 230000008021 deposition Effects 0.000 claims description 7
- 230000003628 erosive effect Effects 0.000 claims description 4
- 238000009713 electroplating Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 101150114468 TUB1 gene Proteins 0.000 description 1
- 230000003698 anagen phase Effects 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 230000035784 germination Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
- F41A21/22—Barrels which have undergone surface treatment, e.g. phosphating
Definitions
- the invention relates to a method for coating the inside of a weapon barrel, on the inner surface to avoid erosion in at least one area a chrome layer is applied by electroplating.
- a disadvantage of this known method is, inter alia, that the electrodeposited ones Hard chrome layers of the increased ammunition do not withstand. The resulting chrome breakouts often make expensive rework required.
- the slowdown of the growth of crystallite or the growth cessation takes place through Impairment of growth of neighboring grains and / or due to an increased rate of defects in the growth process.
- the invention has for its object a method for coating the inside of gun barrels to indicate with a galvanically applied hard chrome layer, which to no significant directional mechanical behavior of the respective chrome layer leads, so that when the gun barrels are used as intended, chrome breakouts can be largely excluded.
- the invention is essentially based on the idea of electrolytic deposition the chrome layer by means of a pulsed electric current one of the number of To deposit current pulses corresponding number of partial chrome layers on one another.
- the pulse duration of the electrical current is chosen such that the respective Crystallite growth during the individual deposited partial chrome layers before their natural end is interrupted, so that the finished chrome layer is a globular polytropic Has chrome structure.
- chrome crystallites which are deposited with an unpulsed direct current, about a length of 5 to 10 ⁇ m, arise when using the invention Process crystallites with a length between about 0.2 and 2 microns. This gives not only an isotropic texture, but also when using a pulsed current a grain refinement that also provides better stability against the chrome layer Causes stress.
- the process also has the advantage that thicker durable by applying multiple layers of chrome with polytropic structure Let chrome layers be produced than this with conventional chrome plating processes is possible.
- Fig. 1 denotes a tub indicated by dashed lines, in which there is a chromic acid containing electrolytic liquid.
- a chromic acid containing electrolytic liquid in which there is a chromic acid containing electrolytic liquid.
- Coating gun barrel 2 arranged.
- An axially located in the gun barrel 2 rod-shaped electrode 3 and the weapon barrel 2 are connected via electrical lines 4, 5 a current source 6 connected to a downstream control unit 7.
- the control unit 7 generates an electrolysis pulse-shaped current 8, which seven pulses 9-15 predetermined height and duration having.
- the respective pulse duration 16 is selected such that the crystallite growth of the partial chrome layers 17-23 deposited by the current pulses 9-15 (FIG. 3) is interrupted before their natural end.
- the individual partial chrome layers 17-23 may be one that corresponds to the length of the chromium crystallites produced in each case Layer thickness of e.g. Have 0.2 to 2 ⁇ m.
- the arrows within the individual chrome crystallites mark the texture alignment.
- the chromium layer 26 consists of a globular polytropic chrome structure.
- chrome layer 27 is one on the inner surface 25 of the weapon barrel 2 by means of direct current deposited chrome layer 27 is shown, which also has a thickness of 70 microns.
- the arrows in turn mark the texture alignment.
- the chrome layer 27 has in in this case a sharp (111) [uvw] texture because this texture layer has a higher growth rate compared to other texture layers.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
- 1
- Wanne
- 2
- Waffenrohr
- 3
- Elektrode
- 4,5
- elektrische Leitungen
- 6
- Stromquelle
- 7
- Steuergerät
- 8
- Strom
- 9-15
- Stromimpulse, Impulse
- 16
- Impulsdauer
- 17-23
- Teilchromschichten
- 24
- zeitliche Abstand
- 25
- innere Oberfläche
- 26,27
- Chromschichten
Claims (3)
- Verfahren zur Innenbeschichtung eines Waffenrohres (2), auf dessen inneren Oberfläche (25) zur Vermeidung von Erosionen mindestens in einem Teilbereich eine Chromschicht (26) durch Elektroplattieren aufgebracht wird, dadurch gekennzeichnet, daß zur elektrolytischen Abscheidung der Chromschicht (26) mittels eines gepulsten elektrischen Stromes (8) eine der Anzahl der elektrischen Stromimpulse (9-15) entsprechende Anzahl von Teilchromschichten (17-23) aufeinander abgeschieden wird und daß die Impulsdauer (16) des elektrischen Stromes (8) derart gewählt wird, daß das Kristallitwachstum während der einzelnen abgeschiedenen Teilchromschichten (17-23) vor ihrem natürlichen Ende unterbrochen wird und die Chromschicht (26) ein globulares polytropes Gefüge aufweist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Kristallitwachstum während des Abscheidens der jeweiligen Teilchromschicht (17-23) abgebrochen wird, wenn die erzeugten Chromkristallite eine Länge von 0,2 bis 2µm aufweisen.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf der inneren Oberfläche (25) des Waffenrohres (2) mindestens 3 Teilchromschichten (17-23) aufeinander abgeschieden werden.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10001888A DE10001888A1 (de) | 2000-01-19 | 2000-01-19 | Verfahren zur Innenbeschichtung eines Waffenrohres |
| DE10001888 | 2000-01-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1118832A2 true EP1118832A2 (de) | 2001-07-25 |
| EP1118832A3 EP1118832A3 (de) | 2001-08-22 |
| EP1118832B1 EP1118832B1 (de) | 2004-11-17 |
Family
ID=7627863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00126825A Expired - Lifetime EP1118832B1 (de) | 2000-01-19 | 2000-12-07 | Verfahren zur Innenbeschichtung eines Waffenrohres |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6562216B2 (de) |
| EP (1) | EP1118832B1 (de) |
| AT (1) | ATE282812T1 (de) |
| DE (2) | DE10001888A1 (de) |
| ES (1) | ES2230023T3 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10255853A1 (de) * | 2002-11-29 | 2004-06-17 | Federal-Mogul Burscheid Gmbh | Herstellung strukturierter Hartchromschichten |
| DE102004019370B3 (de) * | 2004-04-21 | 2005-09-01 | Federal-Mogul Burscheid Gmbh | Herstellung einer strukturierten Hartchromschicht und Herstellung einer Beschichtung |
| US9005420B2 (en) * | 2007-12-20 | 2015-04-14 | Integran Technologies Inc. | Variable property electrodepositing of metallic structures |
| DE102008017270B3 (de) * | 2008-04-04 | 2009-06-04 | Federal-Mogul Burscheid Gmbh | Strukturierte Chrom-Feststoffpartikel-Schicht und Verfahren zu deren Herstellung sowie beschichtetes Maschinenelement |
| US9546837B1 (en) * | 2015-10-09 | 2017-01-17 | Bh5773 Ltd | Advanced gun barrel |
| WO2017210709A1 (de) * | 2016-06-09 | 2017-12-14 | Ritter & Stark Gmbh | Konfigurationsanordnung der apparatur für die herstellung der züge in läufen von feuerwaffen mittels pecm verfahren |
| US10864567B2 (en) | 2018-04-17 | 2020-12-15 | Government Of The United States As Represented By The Secretary Of The Army | Systems and methods for electroprocessing a gun barrel using a moving electrode |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3959088A (en) * | 1975-03-19 | 1976-05-25 | The United States Of America As Represented By The Secretary Of The Army | Method and apparatus for generating high amperage pulses from an A-C power source |
| US4138512A (en) * | 1977-10-17 | 1979-02-06 | The United States Of America As Represented By The Secretary Of The Army | Process for chemical vapor deposition of a homogeneous alloy of refractory metals |
| FR2460340A1 (fr) * | 1979-06-29 | 1981-01-23 | Sygeoda Sa | Procede de traitement de pieces en acier |
| DE3907087A1 (de) * | 1989-03-04 | 1990-09-13 | Rheinmetall Gmbh | Hochdruckbehaelter |
| US5433797A (en) * | 1992-11-30 | 1995-07-18 | Queen's University | Nanocrystalline metals |
| US5516415A (en) * | 1993-11-16 | 1996-05-14 | Ontario Hydro | Process and apparatus for in situ electroforming a structural layer of metal bonded to an internal wall of a metal tube |
| JP3918142B2 (ja) * | 1998-11-06 | 2007-05-23 | 株式会社日立製作所 | クロムめっき部品、クロムめっき方法およびクロムめっき部品の製造方法 |
| DE19853293A1 (de) * | 1998-11-19 | 2000-05-25 | Rheinmetall W & M Gmbh | Verfahren zur Herstellung eines innenseitig mit einer Hartchromschicht versehenen Waffenrohres |
-
2000
- 2000-01-19 DE DE10001888A patent/DE10001888A1/de not_active Withdrawn
- 2000-12-07 ES ES00126825T patent/ES2230023T3/es not_active Expired - Lifetime
- 2000-12-07 DE DE50008662T patent/DE50008662D1/de not_active Expired - Fee Related
- 2000-12-07 EP EP00126825A patent/EP1118832B1/de not_active Expired - Lifetime
- 2000-12-07 AT AT00126825T patent/ATE282812T1/de not_active IP Right Cessation
-
2001
- 2001-01-19 US US09/764,122 patent/US6562216B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| None |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50008662D1 (de) | 2004-12-23 |
| DE10001888A1 (de) | 2001-07-26 |
| US20010025796A1 (en) | 2001-10-04 |
| ES2230023T3 (es) | 2005-05-01 |
| EP1118832A3 (de) | 2001-08-22 |
| EP1118832B1 (de) | 2004-11-17 |
| US6562216B2 (en) | 2003-05-13 |
| ATE282812T1 (de) | 2004-12-15 |
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