Performance evaluation of mechanically pressed Magnesium/Teflon/Viton (MTV) decoy flare pellets

Abstract

Infra-red decoy flares constituting of Magnesium, Teflon and Viton or MTV, is the most widely acceptable off-board counter measures among majority of the defence forces across the world. These flares are essentially pyrotechnic compositions operating in the range of 3–5µm wavelength owing to the selective emission of the combustion products (MgO, MgF2 and oxides of carbon namely CO and CO2). However, literature on manufacturing techniques and performance characteristics of standard configurations flare pellets developed and supplied by few firms globally is somewhat restricted. Hence, this study is an attempt to evaluate the performance of mechanically pressed 50 mm diameter cylindrical MTV pellets. While varying the process parameters viz. charge mass and applied load for pelleting, the cross-sectional area of the pellets and dwell time of applied load have been maintained constant. With increase in applied load, elastic/brittle fracture of the particles occur which increases surface area of contacts between particles. The optimum density was achieved at 8 tons of load. Similarly, the improvement in density with increase in charge mass was observed till L/D ratio of unity was achieved. SEM images confirmed the increase in contact surfaces and reduction in size of particles owing to elastic/brittle fracture. With increase in applied load, the available surface area decreased and there was a conspicuous increase in burn time. With increase in charge mass, the quantity of pyrotechnic mixture available for burning increased leading to increase in burn time.

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Correspondence to Sukamal Adhikary.

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Adhikary, S., Sekhar, H. & Thakur, D.G. Performance evaluation of mechanically pressed Magnesium/Teflon/Viton (MTV) decoy flare pellets. Sādhanā 45, 45 (2020). https://doi.org/10.1007/s12046-020-1273-z

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Keywords

  • Pyrotechnic
  • MTV
  • density
  • burn time
  • infra-red intensity