FR2524630A1 - PYROTECHNIC LIGHTING CHARGE FOR TELEGUIDE MISSILES - Google Patents

Abstract

PYROTECHNICAL LIGHTING CHARGE FOR TELEGUID MISSILES. IN A PYROTECHNIC LIGHTING CHARGE 1 INTENDED FOR TELEGUID MISSILES AND EQUIPPED WITH A METAL COATING COVERING THE INCANDESCENT CHARGE 2 ON THE OBSERVER'S SIDE, A PROTECTIVE LAYER 3 APPLIED ON THE METAL COATING 4 OF THE INCANDED SIDE TURNED LOAD 2 PREVENTS PERFORATION OF THE COATING BEFORE THE END OF THE COMBUSTION OF THE SAID INCANDESCENT LOAD 2.

Description

Pyrotechnic lighting charge for unmanned missiles. The current

  invention relates to a pyrotechnic charge for missiles which are directed at the objective by a shooter who guides them and / or

  using an electro-optical tracking device.

  It is essential that, throughout the flight phase of the missile, these lighting charges

  light as constant as possible in the

infrared.

  Current illuminating charges with internal charges

  burning candles on a bare fire only fill

  This condition is not uncommon, and it is not uncommon that, with such flashing charges, the missile guidewire is damaged by the incandescent material falling apart. In order to overcome this disadvantage, the German patents 1,473,914 and 1,957,524. have already proposed illuminating charges in which a material, burning without substantially increasing the pressure, is covered vis-à-vis an observer of a thin wall of metal, oxidized ceramic or graphite, the walls

  in tantal Jayant so far gave excellent results.

  As a result of the high combustion temperatures of the incandescent charges used for the high-efficiency and low-weight flash fillers, the known walls, with which the combustible material is isolated from an observer and a cable of guidance, are still relatively often destroyed before the end of the

  combustion of the illuminating charge, the substances

  descending descents that could either cause

  truction of a guide wire, either lure the shooter

  or a device for tracking the electro-optical lens.

  It is therefore an object of the invention, without increasing its weight or decreasing its efficiency, to improve an illuminating charge of the aforementioned type so that until the end of its combustion, no projection of materials can occur. 5 lants from the disintegration of its incandescent charge or coating. With a pyrotechnic charge

  guided missiles and metal-coated

  of the combustible material, this result is achieved according to the invention by the fact that the

  metal coating that is turned towards the charge to in-

  candescence is covered with a layer which, at the combustion temperature of this incandescent charge, burns more slowly than the material of the metallic coating, this

  layer which can be made of a metal, a compound

  metallic or ceramic material.

  According to another advantageous feature of the invention, the slower burning layer may contain silicon, carbon or nitrogen. This slower burning layer may also be formed by diffusion of a foreign material into the metal coating.

  the latter case, it is advantageous that these foreign

  be a product of the addition of the charge to

  descence. Compared with the metal-coated illuminants applied on the observer's side, all the aforementioned embodiments have the advantage, for the same overall weight, of having a better coefficient of luminous efficiency and of presenting greater security. against

  the materials are disintegrating for the duration of use

the illuminating charge.

  The invention will be better understood using the

  description of embodiments taken as examples,

  but not limiting, and illustrated by the accompanying drawing.

  Figures 1 and 2 of the drawing show

  details of illuminating charges of any shape

  respectively a part of the incandescent charge and

of its coating.

  In an illuminating charge 1 according to FIG. 1, an incandescent charge 2 burning with low gas emission is in direct thermal contact with a layer 3 of its metallic coating. The material of this layer 3 is chosen so that at the temperature of combustion of the incandescent charge 2, it burns more slowly than the metal coating 4 so that the projection of incandescent materials from the

  load 2 and premature perforation of the coating 4.

  While the metal coating 4 is preferably pure crystalline metal, for example tantalum, the layer 3 may be made of another material, metallic, ceramic or containing silicon, carbon or nitrogen, satisfying the aforementioned conditions ; In the illuminating charge 8 according to FIG. 2, a layer 5 with appropriate characteristics is formed on a metal coating 6 by modifying the structure of the crystalline pure metal constituting it. This modification of the structure is carried out by diffusion of a foreign material into the pure metal of the coating 6, and this, before the assembly of the illuminating charge or during the combustion of the incandescent charge 7 by diffusion of the materials

  added to it.

  Although during the combustion of

  As described above, the material of the metal coating burns faster than its protective layer placed on the side of the incandescent charge, so far no disturbing light burst or destruction of the cable has been observed.

  guiding the effects of disintegrating materials.

Claims (5)

  1 Pyrotechnic lighting charge for telecom missiles with metal coating,   characterized by the fact that the side of the metal coating   that (4,6) which is turned towards the incandescent charge (2,7) is covered with a layer (3,5) which, at the combustion temperature of this incandescent charge (2,7), burns more slowly that the material of the metal coating (4,6).   2 Pyrotechnic lighting charge according to the claim   1, characterized in that the layer (3,5) burning more slowly is constituted by a metal or a intermetallic compound.   3 Pyrotechnic lighting charge according to the   1, characterized in that the layer (3) burning more slowly is constituted by a ceramic material.   4 Pyrotechnic lighting charge according to the   1, characterized in that the slower burning layer (3) contains silicon, carbon or nitrogen.   Pyrotechnic lighting charge according to Claim 2, characterized in that the slower burning layer (5) is formed by diffusion of a   foreign matter in the metal coating (6).   6 Pyrotechnic lighting charge according to the   5, characterized in that the foreign materials are formed by an adduct of the incandescent charge (7).