Pyrotechnic materials

C - Chemistry – Metallurgy – 06 – B

Patent

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Details

C06B 45/14 (2006.01) C06C 5/00 (2006.01) C23C 14/20 (2006.01) F02K 9/14 (2006.01)

Patent

CA 2048641

A pyrotechnic material consists of an oxidisable metal vapour-deposited onto an oxidising polymeric substrate, the metal and polymeric substrate being conjointly capable of exothermic reaction on ignition. The substrate may be provided in flexible film tape form and coated on both sides with metal to provide a flash transfer medium with flash velocities typically within the range 10-100 ms-1. Alternatively the substrate may be sheet or plate material coated with tracks of metal overlaid with alternating films of oxidisable and oxidising materials, to provide a pyrotechnic delay train. The substrate is preferably PTFE and the metal magnesium.

Une matière pyrotechnique se compose d'un métal oxydable déposé en phase vapeur sur un substrat polymère oxydant, le métal et le substrat polymère étant capable conjointement d'une réaction exothermique lorsqu'on les allume. Le substrat peut se présenter sous la forme d'un ruban de film souple revêtu de métal sur les deux côtés afin de produire un milieu de transfert éclair ayant des vitesses éclair typiquement dans une plage comprise entre 10 et 100 ms-1. Dans un autre mode de réalisation le substrat peut se présenter sous la forme d'une feuille ou d'une plaque revêtue de pistes de métal recouvertes de films alternés de matières oxydantes, afin de produire un train de temporisation pyrotechnique. Le substrat est de préférence du PTFE et le métal du magnésium.

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