U.S. patent application number 11/770800 was filed with the patent office on 2008-01-10 for blast effect charge.
This patent application is currently assigned to DIEHL BGT DEFENCE GMBH & CO., KG. Invention is credited to Ernst-Christian Koch.
Application Number | 20080006167 11/770800 |
Document ID | / |
Family ID | 38331717 |
Filed Date | 2008-01-10 |
United States Patent
Application |
20080006167 |
Kind Code |
A1 |
Koch; Ernst-Christian |
January 10, 2008 |
BLAST EFFECT CHARGE
Abstract
A high-explosive blast effect charge of high performance
composed of red phosphorous, an explosive and a binding agent.
Inventors: |
Koch; Ernst-Christian;
(Kaiserslautern, DE) |
Correspondence
Address: |
SCULLY SCOTT MURPHY & PRESSER, PC
400 GARDEN CITY PLAZA, SUITE 300
GARDEN CITY
NY
11530
US
|
Assignee: |
DIEHL BGT DEFENCE GMBH & CO.,
KG
Uberlingen
DE
|
Family ID: |
38331717 |
Appl. No.: |
11/770800 |
Filed: |
June 29, 2007 |
Current U.S.
Class: |
102/306 |
Current CPC
Class: |
C06B 39/00 20130101;
C06B 21/005 20130101; C06B 25/34 20130101 |
Class at
Publication: |
102/306 |
International
Class: |
F42B 1/02 20060101
F42B001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 4, 2006 |
DE |
102006030678.3 |
Claims
1. Blast effect charge, composed of red phosphorous or a compound
containing red phosphorous, an explosive and a binding agent.
2. Blast effect charge according to claim 1, wherein the binding
agent is an inert binding agent.
3. Blast effect charge according to claim 1, wherein the binding
agent is an explosive.
4. Blast effect charge according to any one of claims 1 to 3,
wherein the molecular P/O ratio of the effect charge is at most
2/5.
5. Blast effect charge according to any one of claims 1 to 3,
wherein the molecular P/O ratio of the effect charge is at least
2/5.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a high-explosive blast
effect charge.
[0003] Conventional high-explosive (HE) blast effect charges are
typically composed of mixtures of explosives with metallic fuels
such as boron, silicon, aluminium, titanium, zirconium, magnesium
or mixtures, metal-rich compounds, or alloys of these metals.
[0004] 2. Discussion of the Prior Art
[0005] One inherent disadvantage of the use of metals in binary and
uniform charges of this type is the fact that the combustion of
metal particles is in general influenced only insignificantly by
the atmospheric pressure. This means that the pressure exponent n
in Vielle's Law r=a.p.sup.n is only very small. Furthermore, metals
in principle suffer from the defect that the oxide layers which
adhere to them prevent rapid combustion. In particular, boron,
which is calorifically so advantageous, with a volume-related
combustion enthalpy of 138 MJ/dm.sup.3 is not completely involved
in a reaction owing to the inherent B.sub.2O.sub.3 layer,
irrespective of whether this is in the detonation reaction zone or
during subsequent combustion.
[0006] The problems of conventional blast effect charges based on
metal are therefore:
[0007] a small pressure exponent n of the metals used and thus
scarcely any increase in the combustion rate in enclosed areas,
and
[0008] incomplete reaction of the metals as a result of oxide
layers.
SUMMARY OF THE INVENTION
[0009] One object of the present invention is therefore to provide
a high-explosive blast effect charge which avoids the
abovementioned problems with conventional blast effect charges. One
particular aim is to produce a higher performance blast effect
charge, that is to say faster combustion, which is as complete as
possible, in enclosed areas.
[0010] The blast effect charge proposed according to the present
invention is composed of red phosphorous or a compound containing
red phosphorous, an explosive and a binding agent.
[0011] The advantages of a blast effect charge such as this
containing red phosphorous are, in particular,
[0012] a high pressure exponent n and thus faster combustion in
enclosed areas, and
[0013] high volatility of the resultant oxide, and thus a
contribution to the pressure volume work.
[0014] The blast effect charge is thus highly explosive, burns more
quickly and completely than conventional blast effect charges based
on metal, and thus achieves a very high pressure volume work.
[0015] The binding agent for the blast effect charge can optionally
be an inert binding agent or an explosive, such as TNT or TATB.
[0016] The molecular P/O ratio of the blast effect charge may be
either .ltoreq.2/5 or else .gtoreq.2/5.
DETAILED DESCRIPTION OF THE INVENTION
[0017] The above and further features and advantages of the
invention will be understood better from the following description
of one preferred, non-restrictive, exemplary embodiment.
[0018] The present invention solves the problems described in the
introduction of conventional blast effect charges based on metal,
by the use of red phosphorous.
[0019] When red phosphorous is ignited at atmospheric pressure,
then it burns slowly in the region of 0.1 mm/s. Oxygen-unbalanced
pyrotechnic charges based on red phosphorous in contrast produce
combustion rates of 1/2 mm/s. When charges such as these are
enclosed, the combustion after ignition is even explosive.
[0020] Mixtures comprising the system octogen (explosive with the
overall formula C.sub.4H.sub.8N.sub.8O.sub.8, cyclotetramethylene
tetranitramine, also referred to as Homocyclonite or HMX (High
Melting Explosive)/hydroxyl-terminated polybutadiene (HTPB, use as
a fuel and a binding agent) and red phosphorous (RP) produce
detonation rates which are higher than those of pure HMX. Thus, for
example, the ternary system HMX/HTPB/RP with a mixture ratio of
68/12/20 produces a detonation rate of approximately 11 100 m/s and
a Chapman-Jouget pressure of not less than 55 GPa.
[0021] However, the invention is of course not just restricted to
blast effect charges using the above ternary system
HMX/HTPB/RP.
[0022] For example, an explosive such as TNT or TATB can also be
used as the binding agent, instead of the non-explosive HTPB, which
is difficult to ignite.
[0023] Furthermore, the molecular P/O ratio of the blast effect
charge may be not only .ltoreq.2/5 but also .gtoreq.2/5, depending
on its composition.
[0024] The use of red phosphorous or of compounds containing red
phosphorous in the blast effect charge according to the invention
results in a high pressure exponent n in Vielle's Law as mentioned
initially, which results in faster combustion in enclosed areas.
Furthermore, the resultant oxide is in this case highly volatile
(for example from about 250.degree. C.), which leads to a complete,
or at least virtually complete, reaction of the effect charge,
while at the same time making a contribution to the pressure-volume
work. As is evident from the above description, the blast effect
charge also requires a smaller proportion of expensive nitramines
such as HMX and the like than conventional systems.
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