EP2792661B1 - Charge explosive cylindrique à puissance augmentée - Google Patents

Charge explosive cylindrique à puissance augmentée Download PDF

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Publication number
EP2792661B1
EP2792661B1 EP14001249.3A EP14001249A EP2792661B1 EP 2792661 B1 EP2792661 B1 EP 2792661B1 EP 14001249 A EP14001249 A EP 14001249A EP 2792661 B1 EP2792661 B1 EP 2792661B1
Authority
EP
European Patent Office
Prior art keywords
explosive charge
metal powder
cylindrical explosive
mantle
mass
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.)
Not-in-force
Application number
EP14001249.3A
Other languages
German (de)
English (en)
Other versions
EP2792661A2 (fr
EP2792661A3 (fr
Inventor
Werner Arnold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDW Gesellschaft fuer Verteidigungstechnische Wirksysteme mbH
Original Assignee
TDW Gesellschaft fuer Verteidigungstechnische Wirksysteme mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TDW Gesellschaft fuer Verteidigungstechnische Wirksysteme mbH filed Critical TDW Gesellschaft fuer Verteidigungstechnische Wirksysteme mbH
Publication of EP2792661A2 publication Critical patent/EP2792661A2/fr
Publication of EP2792661A3 publication Critical patent/EP2792661A3/fr
Application granted granted Critical
Publication of EP2792661B1 publication Critical patent/EP2792661B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
    • C06B33/08—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide with a nitrated organic compound
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones

Definitions

  • the invention relates to a cylindrical explosive charge for an active system consisting of fractions of RDX or HMX, a metal powder and a plastic binder.
  • Modern and insensitive explosive charges consist predominantly of the explosives RDX (Hexogen) or HMX (Oktogen), which with plastic binders such as HTPB (Hydroxyl-terminated polybutadiene), whereby a high insensitivity to shock waves is achieved.
  • An increase in the pressure effect is achieved by admixing metal powders such as aluminum, boron, silicon or magnesium.
  • the mass fractions of the metal powder in relation to the other explosive charge components can not be increased arbitrarily.
  • the grain size of the metal powder is in the micrometer range, because then the surface to volume ratio increases greatly, i. the surface of the metal powder to be wetted increases disproportionately. Small grain sizes are interesting for increasing the blast effect.
  • shell charges in which the metal powder is applied as a cladding layer around a conventional nuclear charge.
  • the metal powder thus fills a hollow cylinder volume around an explosive charge core. Due to the detonation of the nuclear charge this Metallpulvermantel is heated by the continuous shock wave and then accelerated laterally outward.
  • the metal powder is initiated to a combustion reaction and in the course more and more with the surrounding air mixed and held by the air-oxygen burning. Due to the resulting hot gases, the blast performance is increasingly increased.
  • Shroud charges are mainly used for indoor applications such as bunkers or buildings.
  • the delimiting walls reflect the resulting air shock waves back into the fireball again and again, while the fuel / air mixture is further heated and swirled with the air.
  • the walls limit the volume and thus prevent adiabatic expansion of the combustion volume, which cool the fuel mixture and thereby may force the termination of the chemical reactions.
  • the concrete structure of such a charge includes a large number of possible parameter variations, which make it possible to optimize such a charge with respect to the blast performance. Examples of this are on the one hand design parameters such as the ratio of core to shell mass, type of nuclear charge and the like. On the other hand, process parameters also play a role, such as the structure and nature of the shell, i. the binder for the powder material. In addition to the blast performance, the physical durability of the mantle charge has to be ensured over a long period of time and the reproducibility of the blast performance must nevertheless be ensured.
  • the invention is therefore based on the object to develop a novel charge build-up in the context of the already mentioned optimization of the parameters, in which within a small bandwidth, the maximum possible blast performance can be achieved.
  • the object is achieved by a combination of features, with a cylindrical explosive charge core, consisting of RDX (hexogen) or HMX (octogen) with a weight fraction of 85-96 wt.% (Depending on whether the production of the charge core takes place in the casting or pressing process 90% or 96% by weight, respectively) mixed with a plastic binder with a weight fraction of 15-4% by weight of HTPB (hydroxyl-terminated polybutadiene), and a tubular casing of a metal powder, such as aluminum, immediately surrounding the cylindrical explosive charge core , Boron, silicon or magnesium, wherein the mean of the particle sizes of the metal powder in so-called mono-modal mixtures is 4 ⁇ m +/- 10%, and in bi-modal mixtures additionally a component of higher particle size of on average 35 ⁇ m + / - Contains 10%, with a proportion of coarse: fine of typically 2: 1, wherein at least a subset of the grains of the metal powder as a result of sintering aneinande and wherein
  • a cylindrical explosive charge has proven to be sufficient to produce a good blast performance in rooms.
  • a charge length to outer diameter ratio (L / D) of 1-5 can be achieved without having to accept blast performance losses.
  • Near-lying external shapes that could theoretically promote air blending e.g., zig-zag wrap shapes
  • the explosive charge core has in its detonation the task of heating the existing metal shell by the continuous shock wave, at the same time to initiate the combustion reaction and to accelerate it radially outward. In the course of the partially burning metal powder mixture is swirled with the air, so that an optimal fast combustion of equip is.
  • the explosive charge core should be as explosive as possible, but also insensitive. Plastic-bonded explosive charges (cast or pressed) with 85-96 wt.% HMX contents and 15-4 wt.% Binder components (preferably HTPB) are best suited.
  • the core mass must not be too large (the ⁇ not too small), otherwise the mantle mass is too low, but this is mainly responsible for the high Blast juice.
  • the jacket with the mass M M offers the greatest potential for optimization in terms of blast performance, but also in terms of process engineering, such as reproducibility etc.
  • the material must consist of metal powders of high heat of combustion. In principle, therefore, all metal powders of high heat of combustion, which have already been mentioned above (for example Al, B, Si, Mg, etc.), are suitable. These can theoretically be used as fuel. In practice, however, there are other selection criteria and features that distinguish certain metal powders from others in this application. These criteria are manifold.
  • Aluminum powder has proven to be a proven material and very suitable for blast performance.
  • the grain size variation gave best values for monomodal mixtures in the range of a few micrometers (mean value about 4 ⁇ m) and for bi-modal mixtures with an additional component of higher particle size (mean value about 35 ⁇ m), with a coarse: fine fraction of typical 2: 1.
  • Boron has significant advantages in terms of high heat of combustion compared to all other metal powders.
  • the addition of aluminum powder acts catalyzing here.
  • the test series showed similarly good blast results as with aluminum once the boron was processed to B / Al powder blends in the ratio of about 1/5 to 3/5, with maximum at 2/5.
  • the existing metal powder coat has certain advantages in unbound powder form with respect.
  • the voids between the powder grains act as so-called "hot spots" for the initiation of combustion.
  • there are also significant disadvantages that cause the powder must be bound with plastic binder.
  • HTPB hydroxyl-terminated polybutadiene
  • HTPB also participates in the chemical reaction.
  • DOA dioctyl adipate
  • IPN isopropyl nitrate
  • An essential concept of bonding and protecting the metal powder matrix is its sintering, without the addition of organic binder materials such as e.g. HTPB.
  • the sintering process is not the classical process that results in a continuous non-porous piece of metal, but rather such that a strong shock wave (caused by the detonation of the nuclear charge) re-disassembles the partially sintered metal powder into its constituent parts, allowing its subsequent combustion to proceed unimpeded.
  • a strong shock wave caused by the detonation of the nuclear charge
  • the feasibility of such sintering technologies has already been provided experimentally. This is a kind of "gluing" (by melting) of the individual metal particles.
  • a thin Al end cover for extended protection of the cargo can also be provided here.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Disintegrating Or Milling (AREA)

Claims (2)

  1. Charge explosive cylindrique à performance améliorée, constituée de RDX (hexogène) ou de HMX (octogène), mélangés à un liant plastique HTPB et à une poudre métallique, telles que aluminium, bore, silicium ou magnésium,
    caractérisée par :
    - un noyau de charge explosive cylindrique, constitué de RDX (hexogène) ou de HMX (octogène) ayant une fraction pondérale de 85 à 96 % en poids, mélangés à un liant plastique ayant une fraction pondérale de 15 à 4 % en poids de HTPB (polybutadiène à terminaison hydroxyle),
    - une gaine tubulaire entourant directement le noyau de charge cylindrique, constituée d'une poudre métallique, telle que aluminium, bore, silicium ou magnésium, la moyenne de la taille des grains de la poudre métallique étant de 4 µm +/- 10 %, et au moins une quantité partielle des grains de la poudre métallique étant reliés de manière adhésive les uns aux autres suite à un frittage,
    - le rapport entre la longueur et le diamètre extérieur (UD) du noyau de charge explosive étant situé dans la plage de UD = 1 à 5,
    - le rapport µ entre la masse de la gaine (MM) et la masse du noyau de charge explosive (MK) étant situé dans la plage µ = 1,9 à 3,3.
  2. Charge explosive cylindrique à performance améliorée selon l'une quelconque des revendications 1, caractérisée en ce que la gaine est entourée par une enveloppe en aluminium à paroi mince.
EP14001249.3A 2013-04-15 2014-04-04 Charge explosive cylindrique à puissance augmentée Not-in-force EP2792661B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013006440.6A DE102013006440A1 (de) 2013-04-15 2013-04-15 Leistungsgesteigerte zylindrische Sprengladung

Publications (3)

Publication Number Publication Date
EP2792661A2 EP2792661A2 (fr) 2014-10-22
EP2792661A3 EP2792661A3 (fr) 2015-01-21
EP2792661B1 true EP2792661B1 (fr) 2018-07-04

Family

ID=50440442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14001249.3A Not-in-force EP2792661B1 (fr) 2013-04-15 2014-04-04 Charge explosive cylindrique à puissance augmentée

Country Status (3)

Country Link
EP (1) EP2792661B1 (fr)
DE (1) DE102013006440A1 (fr)
ES (1) ES2687528T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104803813A (zh) * 2015-04-21 2015-07-29 南京理工科技化工有限责任公司 一种高起爆感度变色导爆管

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2086881A5 (fr) * 1970-04-13 1971-12-31 France Etat
DE10208228B4 (de) * 2002-02-26 2005-03-17 Diehl Munitionssysteme Gmbh & Co. Kg Blastgranate
US6969434B1 (en) * 2002-12-23 2005-11-29 The United States Of America As Represented By The Secretary Of The Navy Castable thermobaric explosive formulations
US6846372B1 (en) * 2003-03-31 2005-01-25 The United States Of America As Represented By The Secretary Of The Navy Reactively induced fragmentating explosives

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2687528T3 (es) 2018-10-25
EP2792661A2 (fr) 2014-10-22
DE102013006440A1 (de) 2014-10-16
EP2792661A3 (fr) 2015-01-21

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