U.S. patent application number 10/058832 was filed with the patent office on 2002-09-05 for combustible shaped ammunition part.
Invention is credited to Jeck-Prosch, Ulrike, Wanninger, Paul.
Application Number | 20020121212 10/058832 |
Document ID | / |
Family ID | 7672080 |
Filed Date | 2002-09-05 |
United States Patent
Application |
20020121212 |
Kind Code |
A1 |
Wanninger, Paul ; et
al. |
September 5, 2002 |
Combustible shaped ammunition part
Abstract
The invention relates to a combustible shaped ammunition part,
such as a propellant case or a propellant charge container, wherein
the combustible shaped ammunition part contains an erosion-reducing
admixture. To ensure that the erosion-reducing admixture leads to a
higher reduction in the erosion effect of the propellant powder in
the shaped ammunition part as compared to known admixtures, the
invention comprises using an oxide of one of the elements of rare
earth, in particular La.sub.2O.sub.3, CeO.sub.2, Y.sub.2O.sub.3
and/or one of the elements of the 6.sup.th subgroup in the periodic
system, especially MoO.sub.3 or WO.sub.3 and/or poly oxy methylene
(POM).
Inventors: |
Wanninger, Paul;
(Hermannsburg, DE) ; Jeck-Prosch, Ulrike;
(Unterschleissheim, DE) |
Correspondence
Address: |
VENABLE, BAETJER, HOWARD AND CIVILETTI, LLP
P.O. BOX 34385
WASHINGTON
DC
20043-9998
US
|
Family ID: |
7672080 |
Appl. No.: |
10/058832 |
Filed: |
January 30, 2002 |
Current U.S.
Class: |
102/435 |
Current CPC
Class: |
C06B 23/04 20130101;
F42B 5/192 20130101 |
Class at
Publication: |
102/435 |
International
Class: |
F42B 005/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 30, 2001 |
DE |
10103912.3 |
Claims
What is claimed is:
1. A combustible shaped ammunition part wherein the combustible
shaped ammunition part contains an erosion-reducing admixture,
comprising an erosion-reducing agent which is an oxide of one of
the elements of rare earth or one of the elements of the 6.sup.th
subgroup in the periodic system, or a poly oxy methylene (POM).
2. A combustible shaped ammunition part according to claim 1,
wherein the erosion-reducing agent is La.sub.2O.sub.3, CeO.sub.2,
or Y.sub.2O.sub.3.
3. A combustible shaped ammunition part according to claim 1,
wherein the erosion-reducing agent is MoO.sub.3 or WO.sub.3.
4. A combustible shaped ammunition part according to claim 1,
wherein the shaped ammunition part contains 2 to 15% of one or more
erosion-reducing agent(s).
5. A combustible shaped ammunition part according to claim 2,
wherein the shaped ammunition part contains 2 to 15% of one or more
erosion-reducing gent(s).
6. A combustible shaped ammunition part according to claim 3,
wherein the shaped ammunition part contains 2 to 15% of one or more
erosion-reducing agent(s).
7. A combustible shaped ammunition part according to claim 1, in
the form of a propellant case or a propellant charge container.
8. A combustible shaped ammunition part according to claim 2, in
the form of a propellant case or a propellant charge container.
9. A combustible shaped ammunition part according to claim 3, in
the form of a propellant case or a propellant charge container.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit, under 35 U.S.C. 119, of
DE 10103912.3 filed Jan. 30, 2001, which is relied upon and is
expressly incorporated by reference herein.
FIELD OF THE INVENTION
[0002] 1. The invention relates to a combustible shaped ammunition
part, such as a propellant case or a propellant charge container,
wherein the shaped ammunition part contains an erosion-reducing
agent.
BACKGROUND OF THE INVENTION
[0003] 2. High-energetic propellant powders, such as the ones
required for firing high-performance projectiles, generate high
temperatures and pressures inside the respective weapon tube and
lead to increased wear due to erosion of the weapon tube.
[0004] 3. Adding talcum, wax, or similar materials to the
propellant powder has been suggested to reduce this type of
erosion. However, these admixtures have proven to have a relatively
low erosion-reducing effect.
[0005] 4. German reference DE 39 27 400 A1 furthermore discloses
adding wax or paraffin as erosion-reducing agent not to the
propellant powder itself, but to the shaped ammunition part that
consists of a combustible plastic shrinking foil. However, this
practice also did not essentially reduce the erosion effect of the
propellant powder on the inside wall of the respective weapon
tube.
[0006] 5. It is an object of the invention to provide a shaped
ammunition part, consisting of a combustible material that contains
erosion-reducing admixtures. These admixtures should result in a
better reduction of the erosion effect, caused by the propellant
powder on the inside surface of a weapon tube, than the erosion
caused by comparable, known admixtures.
DESCRIPTION OF THE INVENTION
[0007] 6. Solution of the problem according to the invention
comprises a combustible shaped ammunition part, such as a
propellant case or a propellant charge container, wherein the
combustible shaped ammunition part contains an erosion-reducing
admixture. The erosion-reducing agent is an oxide of one of the
elements of rare earth or one of the elements of the 6.sup.th
subgroup in the periodic system, or a poly oxy methylene (POM).
Poly oxy methylene resin(s) are acetal resin(s). These resins can
be designated by the empirical formula:
[--CH.sub.2--O--]CH.sub.2]O--CH.sub.2]O--CH.sub.2].sub.x
[0008] in which x.gtoreq.1500[--CH.sub.2--O--] units. Brand names
of two such resins include "Delrin" and "Celcon."
[0009] 7. Essentially, the invention is based on the idea of using
at least one oxide of one of the elements of rare earth, in
particular La.sub.2O.sub.3, CeO.sub.2, Y.sub.2O.sub.3 and/or at
least one element of the 6.sup.th subgroup in the periodic system,
especially MoO.sub.3 or WO.sub.3, and/or poly oxy methylene (POM),
or a combination of these agents as erosion-reducing admixture. The
amount of this reagent(s) can range from 2 to 15% of the
composition comprising the combustible shaped ammunition part.
[0010] 8. The surprisingly good erosion-reducing effect of these
oxides is presumably due to their ablative effect, which leads to a
cooling of the inside wall of the weapon tube from which the
respective ammunition is fired. The ablative effect of the oxides
is explained through the high negative formation heat .DELTA.H of
these oxides and the relatively low boiling points. The weapon tube
is cooled by the enthalpy of vaporization of these oxides, which
are located practically directly against the inside wall of the
weapon tube because of their intercalation into the wall regions of
the shaped ammunition part, so that the erosion is lowered
noticeably.
[0011] 9. For one exemplary embodiment where tungsten trioxide
(WO.sub.3) was used as erosion-reducing admixture in the propellant
case, the erosion of the inside surface of a respective weapon tube
dropped by 47% as compared to standard ammunition, for which no
erosion-reducing admixtures were used in the propellant case.
[0012] 10. To produce the shaped ammunition part according to the
invention, 2 to 15 weight % of one or several erosion-reducing
agents are mixed into the watery slurry (pulp) of the starting
material for producing a shaped ammunition part. Subsequently, the
shaped part is produced in the manner known per se (e.g. by using a
forming core etc.).
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