EP0512100A1 - Masking material effective in the infrared - Google Patents

Masking material effective in the infrared

Info

Publication number
EP0512100A1
EP0512100A1 EP92900300A EP92900300A EP0512100A1 EP 0512100 A1 EP0512100 A1 EP 0512100A1 EP 92900300 A EP92900300 A EP 92900300A EP 92900300 A EP92900300 A EP 92900300A EP 0512100 A1 EP0512100 A1 EP 0512100A1
Authority
EP
European Patent Office
Prior art keywords
powder
coating
dispersion
carrier liquid
nozzle
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.)
Withdrawn
Application number
EP92900300A
Other languages
German (de)
French (fr)
Inventor
Daniel Larmignat
Gilles Lacreuse
Philippe Morand
Christian Prieur
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.)
Giat Industries SA
Original Assignee
Giat Industries SA
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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0512100A1 publication Critical patent/EP0512100A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C06B45/18—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
    • C06D3/00—Generation of smoke or mist (chemical part)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H9/00—Equipment for attack or defence by spreading flame, gas or smoke or leurres; Chemical warfare equipment
    • F41H9/06—Apparatus for generating artificial fog or smoke screens
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
    • Y10T428/2996—Glass particles or spheres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2998—Coated including synthetic resin or polymer

Definitions

  • the field of the present invention is that of pulverulent materials intended to be spread by means of dispersion so as to produce a cloud of camouflage.
  • ⁇ Smoke compositions have already been known for a long time which are effective in the visible range (from 0.4 ⁇ m to 0.8 ⁇ m), these compositions most often comprise an oxidant associated with a reducing agent and with a sublimable compound, see for example the patent US2939779
  • the patent FR2396265 proposes to disperse the solid particles of a mineral powder using a propellant gas.
  • patent US Pat. No. 4,484,195 describes a smoke-producing device dispersing by means of a turbine aluminum particles mixed with gas oil.
  • the invention also provides a smoke generating device suitable for this type of material.
  • the subject of the invention is a pulverulent material intended to be spread by means of dispersion so as to produce an effective camouflage cloud in the infrared range
  • this material is characterized in that it comprises at least one powder of which the grains are coated with a coating which is chemically inert with respect to the grain, a coating resistant to temperatures lower than or equal to the dispersion temperature and not oxidizing in the open air.
  • This coating may be a compound of Silica and Alumina and the average particle size of the coated powder will be chosen between 1 ⁇ m and 15 ⁇ m.
  • the powder may contain at least one of the following components: Iron, Aluminum, Zinc, Boron, Copper, Chromium, alloys or oxides of these metals, carbon, polytetrafluoroethylene.
  • the powder is a brass powder whose average particle size after coating is between 1 ⁇ m and 15 ⁇ m.
  • the invention also relates to a smoke generating device in which the material is suspended in a carrier liquid, in this case the coating is chosen so that it does not oxidize on contact with this liquid either. and for temperatures lower than or equal to the dispersion temperature.
  • the carrier liquid may be chosen from the following compounds: Diesel oil, low viscosity oil.
  • the device comprises a mass of 50 g to 250 g of pulverulent material per liter of diesel.
  • the dispersing means will comprise at least one turbine generating hot gas equipped with a nozzle, a reservoir equipped with a mixer and receiving the pulverulent material in suspension in the carrier liquid, the reservoir being connected to the nozzle by an electric pump.
  • the control of the turbine is only authorized when the mixer is in operation.
  • the invention will be better understood on reading the description which follows of a particular embodiment, description made with reference to the appended drawing which schematically represents a smoke generating device suitable for dispersing the material according to the invention .
  • a smoke generating device suitable for dispersing the material according to the invention .
  • metallic or mineral powders to produce an opaque smoke screen with infrared radiation.
  • Metal powders are particularly interesting because they effectively reflect the infrared radiation received from the target that one seeks to mask.
  • the powder placed in a container is dispersed by means of a propellant gas (such as nitrogen, carbon dioxide or compressed air), the gas arriving through a conduit inside the container and the latter carrying another nozzle-shaped opening to ensure fine dispersion of the powder.
  • a propellant gas such as nitrogen, carbon dioxide or compressed air
  • Patent O8808954 describes such a device.
  • the use of hot air to completely vaporize the mineral oil leads to the choice of particles having good temperature stability such as brass or copper powders.
  • brass powder with an average particle size of between 1 ⁇ m and 15 ⁇ m and dispersed with gas oil by means of hot air does not allow '' obtain a camouflage coefficient of 30% for a target at 200'C seen by a thermal camera 8 ⁇ m-12 ⁇ m at 1000 meters.
  • Patents US3849152 and US2913419 describe the embodiments of such coated colored pigments.
  • the first of these documents describes metallic pigments coated with silica or else polysiloxane
  • the second document shows metallic particles covered with a metallic silicate.
  • the preferred metallic pigments are brass grains coated with a vitreous protective layer and are sold by the company Eckart under the trade name "Resist Rotoflex". Although such a coating could cause fear of poor masking due to the modification of the reflecting power of uncoated brass, it was surprisingly found that the masking was good in the range 0.8 ⁇ m to 15 ⁇ m for the camouflage of all known thermal targets in the current battlefield.
  • the masking of a hot source close to 200 ′ was compared by means of a powder of the Eckart Resist brass type with the masking given by an uncoated brass powder.
  • the powders are in both cases mixed with gas oil and dispersed at a temperature of the order of 400 'by a turbine of the type described below.
  • the average particle size remains invariable even during a dispersion at high temperature (of the order of 400 ° C.).
  • the coating by its electrical insulating capacity prevents the agglomeration of the brass grains during their dispersion and the modification of the average particle size after dispersion which would result therefrom. It is possible from these observations to define other pulverulent materials suitable for infrared smoke masking.
  • this limit temperature is 500 ° C. (temperature of the hot air used to disperse),
  • refractory or ceramic materials are suitable for such an application, such as products based on
  • Silicon such as polysiloxanes. Glasses or glassy products which include a mixture of Silica and Alumina are also well suited.
  • Another advantage of the application according to the invention of a powder coated for the production of effective smoke masking materials in the infrared range is that it becomes possible to use metal powders having a lower temperature resistance. than that of Copper or Brass (such as Aluminum).
  • the coating will maintain the average particle size of the aluminum even after dispersion with mineral oil sprayed at 400 "C.
  • Another advantage is that the known coating methods can be adapted to powders made of non-metallic materials such as plastics or carbon.
  • the attached figure shows a device for dispersing the pulverulent material so as to achieve smoke masking.
  • the device comprises a tank 1 closed by a cover 4 and inside which is placed the pulverulent material mixed with a carrier liquid 2.
  • the latter is chosen in a known manner from compounds such as diesel or oils of low viscosity (less than 13 Centistokes at 37.8 ° C.).
  • These compounds have the characteristic of being able to be vaporized into fine droplets (of the order of a micron) by a current of hot air (of the order of 400 ° C.).
  • a gas oil will be used in which a mass of 50 to 250 grams of pulverulent material is suspended per liter of gas oil.
  • a pipe 7 connects the bottom of the tank to an electric pump 8, another pipe 9 bringing the suspension of the material in the carrier liquid to a dispersion nozzle 10. This nozzle ensures the vaporization of the carrier liquid carrying the grains of the infrared masking material and therefore the production of a cloud 14.
  • the reservoir 1 comprises a mixer 3, comprising two blades carried by an axis which passes through the cover 4 at a bearing 6.
  • This mixer is actuated by an electric motor ⁇ .
  • a control box 12 controls the operation of the dispersing device by means of electrical connections 13a, 13b and 13c.
  • the operation of the device is as follows:

Abstract

Le secteur technique de l'invention est celui des matériaux pulvérulents destinés à être répandus par des moyens de dispersion de façon à produire un nuage de camouflage efficace dans le domaine infrarouge. Le matériau selon l'invention est caractérisé en ce qu'il comprend au moins une poudre dont les grains sont recouverts d'un enrobage chimiquement inerte vis-à-vis du grain, résistant aux températures inférieures ou égales à la température de dispersion, et ne s'oxydant pas à l'air libre. Les moyens de dispersion comprennent au moins une turbine (11) génératrice de gaz chaud équipée d'une tuyère (10), un réservoir (1) équipé d'un mélangeur (3) et recevant le matériau pulvérulent en suspension dans le liquide vecteur, le réservoir étant relié à la tuyère (10) par une électropompe (8).The technical sector of the invention is that of pulverulent materials intended to be spread by means of dispersion so as to produce an effective camouflage cloud in the infrared range. The material according to the invention is characterized in that it comprises at least one powder, the grains of which are covered with a coating which is chemically inert with respect to the grain, resistant to temperatures lower than or equal to the dispersion temperature, and does not oxidize in the open air. The dispersing means comprise at least one turbine (11) generating hot gas equipped with a nozzle (10), a reservoir (1) equipped with a mixer (3) and receiving the pulverulent material in suspension in the carrier liquid, the reservoir being connected to the nozzle (10) by an electric pump (8).

Description

MMERIAU EE MSQl--4QE ΕFFICfCE EΛNS LE DCM\INE Ir^-E^AFOUGEMMERIAU EE MSQl - 4QE ΕFFICfCE EΛNS DCM \ INE Ir ^ -E ^ AFOUGE
Le domaine de la présente invention est celui des matériaux pulvérulents destinés à être répandus par des moyens de dispersion de façon à produire un nuage de camouflage. δ On connaît déjà depuis longtemps des compositions fumigènes qui sont efficaces dans le domaine visible (de 0.4μm à 0.8μm), ces compositions comprennent le plus souvent un oxydant associé à un réducteur et à un composé sublimable, on se reportera par exemple au brevet US2939779The field of the present invention is that of pulverulent materials intended to be spread by means of dispersion so as to produce a cloud of camouflage. δ Smoke compositions have already been known for a long time which are effective in the visible range (from 0.4 μm to 0.8 μm), these compositions most often comprise an oxidant associated with a reducing agent and with a sublimable compound, see for example the patent US2939779
10 qui décrit une composition à base d'hexachloréthane et d'oxyde de zinc.10 which describes a composition based on hexachloroethane and zinc oxide.
La réaction entre ces deux composés produit un écran de fumée grise mais qui ne peut masquer la transmission du rayonnement infrarouge (longueur d'onde de 0.8μm à 14μm), lδ en outre le composé obtenu est fortement corrosif et toxique.The reaction between these two compounds produces a gray smoke screen but which cannot mask the transmission of infrared radiation (wavelength from 0.8 μm to 14 μm), furthermore the compound obtained is highly corrosive and toxic.
Le document Statutory Invention USH769 prévoit de réaliser un masquage dans le domaine optique au moyen de particules de dioxyde de titane dont la granulomètrie est deThe Statutory Invention document USH769 provides for masking in the optical domain by means of titanium dioxide particles whose particle size is
20 l'ordre de 0.3 micromètres. Ces particules sont enrobées de siloxane dans le but d'empêcher la détonation du nuage obtenu. Le masquage obtenu n'empêche pas la transmission du rayonnement infra rouge.20 on the order of 0.3 micrometers. These particles are coated with siloxane in order to prevent the detonation of the cloud obtained. The masking obtained does not prevent the transmission of infrared radiation.
Il est connu également de produire des brouillards deIt is also known to produce mists of
25 fines gouttelettes en vaporisant des huiles au moyen de compresseurs de gaz mais ces brouillards sont également transparents dans le domaine infra rouge.25 fine droplets by vaporizing oils by means of gas compressors but these mists are also transparent in the infrared range.
Le brevet FR2396265 propose de disperser les particules solides d'une poudre minérale à l'aide d'un gaz propulseur.The patent FR2396265 proposes to disperse the solid particles of a mineral powder using a propellant gas.
30 Lorsque la granulomètrie moyenne de la poudre est homogène et proche de la longueur d'onde du rayonnement à occulter on peut obtenir un masquage infra rouge, cependant on a pu constater que, lors d'une dispersion à froid des particules décrites par ce brevet, il se produisait une 5 agglomération de ces dernières qui nuisait à l'opacité recherchée. On a aussi cherché à obtenir un masquage à la fois dans les domaines visibles et Infra rouge en vaporisant une huile chargée d'une poudre minérale.When the average particle size of the powder is homogeneous and close to the wavelength of the radiation to be obscured, infrared masking can be obtained, however it has been observed that, during a cold dispersion of the particles described by this patent , there was an agglomeration of the latter which detracted from the desired opacity. We have also sought to obtain masking in both the visible and infrared ranges by spraying an oil loaded with a mineral powder.
Par exemple le brevet US4484195 décrit un dispositif fumigène dispersant au moyen d'une turbine des particules d'aluminium mélangées à du gas oil.For example, patent US Pat. No. 4,484,195 describes a smoke-producing device dispersing by means of a turbine aluminum particles mixed with gas oil.
Un tel dispositif est très décevant puisque les particules d'aluminium se dégradent fortement lors de la dispersion. Le document Statutory Invention USH360 décrit une grenade fumigène efficace dans le domaine infra rouge et utilisant de fines particules de laiton ou d'aluminium disposées dans un liquide volatil. Une telle disposition permet de réduire l'énergie de dispersion et empêche l'agglomération des particules.Such a device is very disappointing since the aluminum particles degrade strongly during dispersion. The Statutory Invention document USH360 describes a smoke grenade effective in the infrared field and using fine particles of brass or aluminum disposed in a volatile liquid. Such an arrangement makes it possible to reduce the dispersion energy and prevents agglomeration of the particles.
En fait l'agglomération n'est pas interdite de façon suffisamment efficace et les performances du masquage infra rouge obtenu sont décevantes. En outre une telle grenade ne peut masquer que des surfaces de dimensions réduites et pendant un temps limité.In fact, agglomeration is not prohibited sufficiently effectively and the performance of the infrared masking obtained is disappointing. In addition, such a grenade can only mask surfaces of reduced dimensions and for a limited time.
C'est un premier but de l'invention que de fournir un matériau pulvérulent destiné à produire des fumées donnant un masquage infra rouge meilleur que celui des matériaux selon l'état de la technique. L'invention propose également un dispositif générateur de fumée adapté à ce type de matériau.It is a first object of the invention to provide a pulverulent material intended to produce fumes giving an infrared masking better than that of the materials according to the prior art. The invention also provides a smoke generating device suitable for this type of material.
Ainsi l'invention a pour objet un matériau pulvérulent destiné à être répandu par des moyens de dispersion de façon à produire un nuage de camouflage efficace dans le domaine infra-rouge, ce matériau est caractérisé en ce qu'il comprend au moins une poudre dont les grains sont recou¬ verts d'un enrobage qui est chimiquement inerte vis à vis du grain, enrobage résistant aux températures inférieures ou égales à la température de dispersion et ne sOxydant pas à l'air libre.Thus, the subject of the invention is a pulverulent material intended to be spread by means of dispersion so as to produce an effective camouflage cloud in the infrared range, this material is characterized in that it comprises at least one powder of which the grains are coated with a coating which is chemically inert with respect to the grain, a coating resistant to temperatures lower than or equal to the dispersion temperature and not oxidizing in the open air.
Cet enrobage pourra être un composé de Silice et d'Alumine et la granulomètrie moyenne de la poudre enrobée sera choisie comprise entre lμm et 15μm. La poudre pourra contenir au moins un des composants suivants: Fer, Aluminium, Zinc, Bore, Cuivre, Chrome, alliages ou oxydes de ces métaux, carbone, polytetrafluo- réthylène. De façon préférentielle la poudre est une poudre de laiton dont la granulomètrie moyenne après enrobage est comprise entre lμm et 15μm.This coating may be a compound of Silica and Alumina and the average particle size of the coated powder will be chosen between 1 μm and 15 μm. The powder may contain at least one of the following components: Iron, Aluminum, Zinc, Boron, Copper, Chromium, alloys or oxides of these metals, carbon, polytetrafluoroethylene. Preferably, the powder is a brass powder whose average particle size after coating is between 1 μm and 15 μm.
L'invention a également pour objet un dispositif générateur de fumée dans lequel le matériau est en suspension dans un liquide vecteur, dans ce cas l'enrobage est choisi de telle sorte qu'il ne s'oxyde pas non plus au contact de ce liquide et pour les températures inférieures ou égales à la température de dispersion.The invention also relates to a smoke generating device in which the material is suspended in a carrier liquid, in this case the coating is chosen so that it does not oxidize on contact with this liquid either. and for temperatures lower than or equal to the dispersion temperature.
Le liquide vecteur pourra être choisi parmi les composés suivants: Gasoil, huile de faible viscosité.The carrier liquid may be chosen from the following compounds: Diesel oil, low viscosity oil.
De façon préférentielle, le dispositif comprend une masse de 50 g à 250 g de matériau pulvérulent par litre de gasoil.Preferably, the device comprises a mass of 50 g to 250 g of pulverulent material per liter of diesel.
Les moyens de dispersion comprendront au moins une turbine génératrice de gaz chaud équipée d'une tuyère, un réservoir équipé d'un mélangeur et recevant le matériau pulvérulent en suspension dans le liquide vecteur, le réservoir étant relié à la tuyère par une électropompe.The dispersing means will comprise at least one turbine generating hot gas equipped with a nozzle, a reservoir equipped with a mixer and receiving the pulverulent material in suspension in the carrier liquid, the reservoir being connected to the nozzle by an electric pump.
D'une façon avantageuse la commande de la turbine n'est autorisée que lorsque le mélangeur est en fonction. L'invention sera mieux comprise à la lecture de la description qui va suivre d'un mode particulier de réalisa¬ tion, description faite en référence au dessin annexé qui représente schématiquement un dispositif générateur de fumée adapté à la dispersion du matériau selon l'invention. Comme cela a déjà été précisé dans le préambule il était connu d'utiliser des poudres métalliques ou minérales pour réaliser un écran de fumée opaque aux rayonnements infra rouges. Les poudres métalliques sont particulièrement inté¬ ressantes car elles réfléchissent avec efficacité le rayon- nement infra rouge reçu de la cible que l'on cherche à masquer. La poudre disposée dans un récipient est dispersée au moyen d'un gaz propulseur (tel de l'azote, du dioxyde de carbone ou de l'air comprimé), le gaz arrivant par un conduit à l'intérieur du récipient et ce dernier portant une autre ouverture en forme de tuyère pour assurer une dispersion fine de la poudre. Un tel dispositif est décrit dans le brevet FR2396265.Advantageously, the control of the turbine is only authorized when the mixer is in operation. The invention will be better understood on reading the description which follows of a particular embodiment, description made with reference to the appended drawing which schematically represents a smoke generating device suitable for dispersing the material according to the invention . As already stated in the preamble, it was known to use metallic or mineral powders to produce an opaque smoke screen with infrared radiation. Metal powders are particularly interesting because they effectively reflect the infrared radiation received from the target that one seeks to mask. The powder placed in a container is dispersed by means of a propellant gas (such as nitrogen, carbon dioxide or compressed air), the gas arriving through a conduit inside the container and the latter carrying another nozzle-shaped opening to ensure fine dispersion of the powder. Such a device is described in patent FR2396265.
Il est également connu de mélanger la poudre à un liquide vecteur (le plus souvent une huile minérale) qui sera vaporisé par de l'air chaud au travers d'une tuyère ce qui permet d'obtenir un nuage plus durable et masquant en outre le domaine visible (taille des gouttelettes inférieure à lμm) .It is also known to mix the powder with a carrier liquid (most often a mineral oil) which will be vaporized by hot air through a nozzle which allows to obtain a more durable cloud and also masking the visible range (droplet size less than 1 μm).
Le brevet O8808954 décrit un tel dispositif. L'emploi d'air chaud pour vaporiser complètement l'huile minérale (température de l'ordre de 400°C) conduit au choix de particules présentant une bonne stabilité à la tempé¬ rature telles les poudres de laiton ou de cuivre.Patent O8808954 describes such a device. The use of hot air to completely vaporize the mineral oil (temperature of the order of 400 ° C) leads to the choice of particles having good temperature stability such as brass or copper powders.
Cependant dans tous les cas on constate que les performances du masquage infra rouge sont décevantes, ainsi on a pu constater que de la poudre de laiton de granulomètrie moyenne comprise entre lμm et 15μm et dispersée avec du Gasoil au moyen d'air chaud ne permettait d'obtenir qu'un coefficient de camouflage de 30% pour une cible à 200'C vue par une caméra thermique 8μm-12μm à 1000 mètres.However, in all cases it is observed that the performance of infrared masking is disappointing, thus it has been observed that brass powder with an average particle size of between 1 μm and 15 μm and dispersed with gas oil by means of hot air does not allow '' obtain a camouflage coefficient of 30% for a target at 200'C seen by a thermal camera 8μm-12μm at 1000 meters.
On a alors pensé à utiliser pour réaliser le masquage infra rouge un matériau pulvérulent qui était commercialisé comme additif colorant pour les peintures ou pour les matières plastiques.We then thought of using a pulverulent material which was marketed as a coloring additive for paints or for plastics for infrared masking.
Les brevets US3849152 et US2913419 décrivent les modes de réalisation de tels pigments colorés enrobés.Patents US3849152 and US2913419 describe the embodiments of such coated colored pigments.
Le premier de ces documents décrit des pigments métalliques enrobés de silice ou bien de polysiloxane, le second document montre des particules métalliques recouvertes d'un silicate métallique. Les pigments métalliques préférés sont des grains de laiton enrobés d'une couche protectrice vitreuse et sont commercialisés par la société Eckart sous la dénomination commerciale "Resist Rotoflex" . Bien qu'un tel enrobage ait pu faire craindre un mauvais masquage en raison de la modification du pouvoir réfléchis¬ sant du laiton non enrobé, on a constaté de façon surpre¬ nante que le masquage était bon dans la gamme 0.8μm à 15μm pour le camouflage de toutes les cibles thermiques connues du champ de bataille actuel.The first of these documents describes metallic pigments coated with silica or else polysiloxane, the second document shows metallic particles covered with a metallic silicate. The preferred metallic pigments are brass grains coated with a vitreous protective layer and are sold by the company Eckart under the trade name "Resist Rotoflex". Although such a coating could cause fear of poor masking due to the modification of the reflecting power of uncoated brass, it was surprisingly found that the masking was good in the range 0.8 μm to 15 μm for the camouflage of all known thermal targets in the current battlefield.
Ainsi à titre d'exemple on a comparé le masquage d'une source chaude voisine de 200' au moyen d'une poudre du type laiton Eckart Resist avec le masquage donné par une poudre de laiton non enrobé. Les poudres sont dans les deux cas mélangées à du gas oil et dispersées à une température de l'ordre de 400' par une turbine du type de celle décrite par la suite.Thus, by way of example, the masking of a hot source close to 200 ′ was compared by means of a powder of the Eckart Resist brass type with the masking given by an uncoated brass powder. The powders are in both cases mixed with gas oil and dispersed at a temperature of the order of 400 'by a turbine of the type described below.
L'observation a été faite au moyen d'une caméra thermique 8-12 micromètres. On a pu constater que la poudre de laiton enrobée occultait totalement le rayonnement infra rouge de façon continue (coefficient de camouflage de 100%), tandis que le laiton non enrobé ne masquait la source chaude qu'avec un coefficient de camouflage de 30%, toutes les conditions opératoires étant identiques par ailleurs. Un tel comportement est dû au fait que l'enrobage empêche la dégradation du grain de laiton tant au cours du stockage (à l'air libre ou dans l'huile minérale) que pendant sa dispersion par l'air chaud.The observation was made using an 8-12 micrometer thermal camera. It has been observed that the coated brass powder completely obscures the infrared radiation continuously (camouflage coefficient of 100%), while the uncoated brass only masks the hot source with a camouflage coefficient of 30%, all the operating conditions being identical elsewhere. Such behavior is due to the fact that the coating prevents the degradation of the brass grain both during storage (in the open air or in mineral oil) and during its dispersion by hot air.
Ainsi, l'oxydation superficielle des grains de poudre métallique étant empêchée, la granulomètrie moyenne demeure invariable même au cours d'une dispersion à haute température (de l'ordre de 400'C).Thus, the surface oxidation of the metal powder grains being prevented, the average particle size remains invariable even during a dispersion at high temperature (of the order of 400 ° C.).
De plus l'enrobage par ses capacités d'isolant électrique empêche l'agglomération des grains de laiton lors de leur dispersion et la modification de la granulomètrie moyenne après dispersion qui en résulterait. Il est possible à partir de ces constatations de définir d'autres matériaux pulvérulents adaptés au masquage fumigène infra rouge.In addition, the coating by its electrical insulating capacity prevents the agglomeration of the brass grains during their dispersion and the modification of the average particle size after dispersion which would result therefrom. It is possible from these observations to define other pulverulent materials suitable for infrared smoke masking.
Les caractéristiques de l'enrobage adapté à l'application selon l'invention sont les suivantes:The characteristics of the coating suitable for the application according to the invention are as follows:
Il doit être chimiquement inerte vis à vis du grain métallique, afin d'éviter la formation de tout produit susceptible de modifier la forme ou la taille du grain.It must be chemically inert with respect to the metallic grain, in order to avoid the formation of any product liable to modify the shape or size of the grain.
Il doit résister aux températures inférieures ou égales à la température de dispersion. Le plus souvent cette tempéra¬ ture limite est de 500°C (température de l'air chaud utilisé pour disperser) ,It must withstand temperatures lower than or equal to the dispersion temperature. Most often this limit temperature is 500 ° C. (temperature of the hot air used to disperse),
Il ne doit pas s'oxyder lors de stockages prolongés en particulier à l'air libre. Dans le cas d'une dispersion à l'aide d'un vecteur (tel une huile minérale) il ne doit pas non plus s'oxyder au contact de ce dernier et pour des températures inférieures ou égales à la température de dispersion.It must not oxidize during prolonged storage, especially in the open air. In the case of a dispersion using a vector (such as a mineral oil), it must not oxidize on contact with the latter and for temperatures lower than or equal to the dispersion temperature.
La plupart des matériaux réfractaires ou céramiques sont adaptés à une telle application, tels les produits à base deMost refractory or ceramic materials are suitable for such an application, such as products based on
Silice (au moins 91% de Silice Si02), les produits SiliceuxSilica (at least 91% Silica Si02), Siliceous products
(de 85% à 93% de Silice et plus de 5% d'Alumine), les composés à base d'alumine ou les composés organiques du(from 85% to 93% of Silica and more than 5% of Alumina), alumina-based compounds or organic compounds of
Silicium (tels les polysiloxanes) . Les verres ou produits vitreux qui comprennent un mélange de Silice et d*Alumine sont également bien adaptés.Silicon (such as polysiloxanes). Glasses or glassy products which include a mixture of Silica and Alumina are also well suited.
Des procédés d'enrobage de grains métalliques sont connus par exemple dans le domaine technique des pigments pour peintures et on pourra se reporter au brevet GB1555883 de la société Eckart qui décrit un mode d'obtention d'une couche vitreuse sur des pigments métalliques ainsi qu'aux brevets US3849152 et US2913419 précédemment cités.Methods for coating metallic grains are known for example in the technical field of pigments for paints and reference may be made to patent GB1555883 of the company Eckart which describes a method of obtaining a vitreous layer on metallic pigments as well as 'to the patents US3849152 and US2913419 previously cited.
D'autres procédés d'enrobage sont connus, tels la disper¬ sion d'alumine fondue dans un courant gazeux (brevet SU1502535), la vapodéposition plasma de la silice (brevets J62153337 et J61266456), l'enrobage de particule par une huile silicone suivi de la réduction de cette dernière à haute température (> 350°C) (brevets J77036861 et J58077505) .Other coating processes are known, such as the dispersion of alumina melted in a gas stream (patent SU1502535), the plasma vapor deposition of silica (patents J62153337 and J61266456), the coating of particles with a silicone oil followed by the reduction of the latter at high temperature (> 350 ° C) (patents J77036861 and J58077505).
Un autre avantage de l'application selon l'invention d'une poudre enrobée à la réalisation de matériaux de masquage fumigène efficaces dans le domaine infra rouge, est qu'il devient possible d'utiliser des poudres métalliques présentant une tenue à la température moindre que celle du Cuivre ou du Laiton (tel l'Aluminium). L'enrobage assurera la tenue de la granulomètrie moyenne de l'Aluminium même après dispersion par de l'huile minérale vaporisée à 400"C.Another advantage of the application according to the invention of a powder coated for the production of effective smoke masking materials in the infrared range, is that it becomes possible to use metal powders having a lower temperature resistance. than that of Copper or Brass (such as Aluminum). The coating will maintain the average particle size of the aluminum even after dispersion with mineral oil sprayed at 400 "C.
Un autre avantage est que les procédés d'enrobage connus peuvent être adaptés à des poudres en matériaux non métal- liques tels les matières plastiques ou bien le carbone.Another advantage is that the known coating methods can be adapted to powders made of non-metallic materials such as plastics or carbon.
Il devient ainsi possible d'employer pour réaliser le masquage infra-rouge des matériaux plus légers que les poudres métalliques ce qui assurera une meilleure tenue du nuage dans le temps, on peut par exemple envisager l'enrobage de graphite ou de polytetrafluoréthylène (plus connu sous la marque déposée Teflon).It thus becomes possible to use to carry out the infrared masking of materials lighter than metallic powders which will ensure better resistance of the cloud over time, one can for example consider the coating of graphite or polytetrafluoroethylene (better known under the Teflon trademark).
La figure annexée montre un dispositif permettant de disperser le matériau pulvérulent de façon à réaliser un masquage fumigène. Le dispositif comprend une cuve 1 fermée par un couvercle 4 et à l'intérieur de laquelle est disposé le matériau pulvérulent mélangé à un liquide vecteur 2.The attached figure shows a device for dispersing the pulverulent material so as to achieve smoke masking. The device comprises a tank 1 closed by a cover 4 and inside which is placed the pulverulent material mixed with a carrier liquid 2.
Ce dernier est choisi de manière connue parmi les composés tels le Gasoil ou les huiles de faible viscosité (inférieure à 13 Centistokes à 37,8'C).The latter is chosen in a known manner from compounds such as diesel or oils of low viscosity (less than 13 Centistokes at 37.8 ° C.).
Ces composés présentent la caractéristique de pouvoir être vaporisés en fines gouttelettes (de l'ordre du micron) par un courant d'air chaud (de l'ordre de 400°C).These compounds have the characteristic of being able to be vaporized into fine droplets (of the order of a micron) by a current of hot air (of the order of 400 ° C.).
On utilisera de façon préférentielle un gasoil dans lequel est mise en suspension une masse de 50 à 250 grammes de matériau pulvérulent par litre de gasoil. Une canalisation 7 relie le fond du réservoir a une électropompe 8, une autre canalisation 9 amenant à une tuyère de dispersion 10 la suspension du matériau dans le liquide vecteur. Cette tuyère assure la vaporisation du liquide vecteur portant les grains du matériau de masquage infra rouge et donc la production d'un nuage 14.Preferably, a gas oil will be used in which a mass of 50 to 250 grams of pulverulent material is suspended per liter of gas oil. A pipe 7 connects the bottom of the tank to an electric pump 8, another pipe 9 bringing the suspension of the material in the carrier liquid to a dispersion nozzle 10. This nozzle ensures the vaporization of the carrier liquid carrying the grains of the infrared masking material and therefore the production of a cloud 14.
Elle est disposée à la sortie d'une turbine 11 connue qui ne sera pas décrite plus en détail et qui produit un courant d'air chaud (T de l'ordre de 400"C et débit d'air de l'ordre de 1 m3/seconde).It is disposed at the outlet of a known turbine 11 which will not be described in more detail and which produces a current of hot air (T of the order of 400 "C and air flow of the order of 1 m3 / second).
Afin d'assurer l'homogénéité de la suspension du matériau pulvérulent dans le liquide vecteur, le réservoir 1 comporte un mélangeur 3, comprenant deux pales portées par un axe qui traverse le couvercle 4 au niveau d'un palier 6. Ce mélangeur est actionné par un moteur électrique δ.In order to ensure the homogeneity of the suspension of the pulverulent material in the carrier liquid, the reservoir 1 comprises a mixer 3, comprising two blades carried by an axis which passes through the cover 4 at a bearing 6. This mixer is actuated by an electric motor δ.
Un boîtier de commande 12 assure le pilotage du fonctionnement du dispositif de dispersion au moyen de liaisons électriques 13a, 13b et 13c. Le fonctionnement du dispositif est le suivant:A control box 12 controls the operation of the dispersing device by means of electrical connections 13a, 13b and 13c. The operation of the device is as follows:
Tout d'abord le moteur 5 du mélangeur est mis en marche. Un câblage logique (non représenté) du boîtier de com¬ mande interdit tout démarrage de la turbine si le mélangeur ne fonctionne pas, ce qui garantit l'homogénéité de la suspension au moment de sa dispersion.First of all the motor 5 of the mixer is started. Logical wiring (not shown) of the control box prevents any starting of the turbine if the mixer does not work, which guarantees the homogeneity of the suspension when it is dispersed.
Ensuite la turbine 11 est à son tour mise en marche. Lorsque la température de l'air éjecté par la turbine, qui est mesurée par un moyen approprié au niveau de la turbine, atteint la valeur nécessaire pour que le liquide vecteur puisse être vaporisé, un autre câblage logique du boîtier de commande autorise la commande de 1'électropompe 8 dont l'action entraîne l'émission du nuage de camouflage 14. Un tel dispositif est installé de préférence sur un véhicule dont la mobilité permet la réalisation rapide d'écrans de camouflage de grandes dimensions. Il est également possible de prévoir des moyens permettant de faire varier le débit du mélange arrivant à la tuyère (réglage électronique du débit de 1'électropompe ou batterie de plusieurs électropompes en parallèle.Then the turbine 11 is in turn started. When the temperature of the air ejected by the turbine, which is measured by an appropriate means at the level of the turbine, reaches the value necessary for the carrier liquid to be vaporized, another logic wiring of the control box authorizes the control of 1'electropump 8 whose action causes the emission of the camouflage cloud 14. Such a device is preferably installed on a vehicle whose mobility allows the rapid production of large camouflage screens. It is also possible to provide means making it possible to vary the flow rate of the mixture arriving at the nozzle (electronic adjustment of the flow rate of the electric pump or battery of several electric pumps in parallel.
Ce qui permet d'optimiser la quantité de mélange solide/liquide en fonction de la température de la cible à camoufler. This optimizes the amount of solid / liquid mixture depending on the temperature of the target to be camouflaged.

Claims

REVENDICATIONS
1-Matériau pulvérulent destiné à être répandu par des moyens de dispersion de façon à produire un nuage de camouflage efficace dans le domaine infra-rouge, matériau caractérisé en ce qu' il comprend au moins une poudre dont les grains sont recouverts d'un enrobage chimiquement inerte vis à vis du grain, résistant aux températures inférieures ou égales à la température de dispersion, et ne sOxydant pas à l'air libre.1-Powdery material intended to be spread by means of dispersion so as to produce an effective camouflage cloud in the infrared range, material characterized in that it comprises at least one powder, the grains of which are covered with a coating chemically inert with respect to the grain, resistant to temperatures lower than or equal to the dispersion temperature, and not oxidizing in the open air.
2- atériau selon la revendication 1, caractérisé en ce l'enrobage est un composé de Silice et d'Alumine.2- material according to claim 1, characterized in that the coating is a compound of Silica and Alumina.
3-Matériau selon une des revendications 1 ou 2, carac¬ térisé en ce que la granulomètrie moyenne de la poudre enrobée est comprise entre lμm et 15μm.3-Material according to one of claims 1 or 2, charac¬ terized in that the average particle size of the coated powder is between lμm and 15μm.
4-Matériau selon une des revendications 1 à 3, caracté- risé en ce que la poudre contient au moins un des composants suivants: Fer, Aluminium, Zinc, Bore, Cuivre, Chrome, alliages ou oxydes de ces métaux, carbone, polytetrafluo¬ réthylène.4-Material according to one of claims 1 to 3, characterized in that the powder contains at least one of the following components: Iron, Aluminum, Zinc, Boron, Copper, Chromium, alloys or oxides of these metals, carbon, polytetrafluo¬ retethylene.
5-Matériau selon la revendication 4, caractérisé en ce que la poudre est une poudre de laiton dont la granulomètrie moyenne après enrobage est comprise entre lμm et lδμm.5-Material according to claim 4, characterized in that the powder is a brass powder whose average particle size after coating is between lμm and lδμm.
6-Dispositif générateur de fumée utilisant le matériau selon une des revendications 1 à 5, caractérisé en ce que le matériau est en suspension dans un liquide vecteur, et en ce que l'enrobage ne s'oxyde pas au contact de ce liquide et pour des températures inférieures ou égales à la température de dispersion.6-Smoke generating device using the material according to one of claims 1 to 5, characterized in that the material is suspended in a carrier liquid, and in that the coating does not oxidize on contact with this liquid and for temperatures less than or equal to the dispersion temperature.
7-Dispositif selon la revendication 6, caractérisé en ce que le liquide vecteur est choisi parmi les composés suivants: Gasoil, huile de faible viscosité.7-Device according to claim 6, characterized in that the carrier liquid is chosen from the following compounds: Diesel, oil of low viscosity.
8-Dispositif selon la revendication 7 caractérisé en ce qu'il comprend une masse de 50 g à 250 g de matériau pulvérulent par litre de gasoil.8-Device according to claim 7 characterized in that it comprises a mass of 50 g to 250 g of pulverulent material per liter of diesel.
9-Dispositif selon une des revendications 6 à 8, caractérisé en ce que les moyens de dispersion comprennent au moins une turbine (11) génératrice de gaz chaud équipée d'une tuyère (10), un réservoir (1) équipé d'un mélangeur { 3 ) et recevant le matériau pulvérulent en suspension dans le liquide vecteur, le réservoir étant relié à la tuyère (10) par une électropompe (8). 10-Dispositif selon la revendication 9, caractérisé en ce que la commande de la turbine (11) n'est autorisée que lorsque le mélangeur (3) est en fonction. 9-Device according to one of claims 6 to 8, characterized in that the dispersion means comprise at least one turbine (11) generating hot gas equipped a nozzle (10), a reservoir (1) equipped with a mixer {3) and receiving the pulverulent material in suspension in the carrier liquid, the reservoir being connected to the nozzle (10) by an electric pump (8). 10-Device according to claim 9, characterized in that the control of the turbine (11) is only authorized when the mixer (3) is in operation.
EP92900300A 1990-11-22 1991-11-21 Masking material effective in the infrared Withdrawn EP0512100A1 (en)

Applications Claiming Priority (2)

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FR9014561A FR2669625B1 (en) 1990-11-22 1990-11-22 EFFECTIVE MASKING MATERIAL IN THE INFRARED FIELD.
FR9014561 1990-11-22

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ZA919125B (en) 1992-08-26
US5340395A (en) 1994-08-23
AU9041291A (en) 1992-06-25
FR2669625B1 (en) 1994-06-03
CA2072979C (en) 1999-04-20
JPH05503685A (en) 1993-06-17
WO1992009544A1 (en) 1992-06-11
AU645162B2 (en) 1994-01-06
NO179139B (en) 1996-05-06
CA2072979A1 (en) 1992-05-23
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FR2669625A1 (en) 1992-05-29
NO179139C (en) 1996-08-14

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