Thermoanalytical investigation of relative reactivity of some nitrate oxidants in tin-fueled pyrotechnic systems

Hosseini, Seyed Ghorban; Eslami, Abbas

doi:10.1007/s10973-010-0813-x

Cited by 40 publications

(19 citation statements)

References 24 publications

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“…When KNO 3 was heated above 600 °C, it released oxygen and formed potassium nitrite (KNO 2 ). KNO 2 decomposition started above 700 °C and formed K 2 O and O 2 [25]. The DTG curve (Figure 4b) shows two decomposition peaks in the temperature range 600-850 °C, first at 684 °C for KNO 3 , and second at 712 °C for KNO 2 .…”

Section: Dsc and Tg-dtg Of An And Kdnmentioning

confidence: 98%

Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts

Kumar¹,

Joshi²

2017

Cent. Eur. J. Energ. Mater.

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Potassium dinitramide (KDN) was incorporated in ammonium nitrate (AN) crystals in AN/KDN ratio of 90/10, 75/25 and 50/50 by a co-crystallization method. These mixtures were subjected to thermal decompositional studies (DSC-TG) using a Simultaneous Thermal Analyzer (STA). The catalysts used for the present studies were: i) cupric(II) oxide (CuO) and, ii) copper-cobalt based metal oxide (Cu-Co * ). For all catalytic samples, 2% by weight percent of catalyst was added to the total weight of the samples. Thermal decomposition studies were carried out for all the oxidizer samples prepared. Thermal decompositional studies were carried out at three different heating rates, i.e. 3 K/min, 5 K/min and 10 K/min, and the kinetic parameters were computed using the model free FlynnWall-Ozawa equation. It has been observed that 50% KDN addition resulted in complete suppression of endothermicity indicating total supression of the phase changes of AN in this temperature range. Further, it was noticed that CuO acts as a better phase stabilizer for AN as compared to Cu-Co * . However, Cu-Co * considerably increased the net exothermic decompositional heat release (J/g) of AN.

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Section: Dsc and Tg-dtg Of An And Kdnmentioning

confidence: 98%

Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts

Kumar¹,

Joshi²

2017

Cent. Eur. J. Energ. Mater.

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“…The oxygen is released during the thermal decomposition of the oxidizers and reacts with the fuel to ignite the pyrotechnic mixture. Nature of both the fuel and the oxidizer play an important role in the ignition behaviour . Factors such as temperature, humidity, impact, thermal shock etc.…”

Section: Introductionmentioning

confidence: 99%

Accelerated ageing of SR‐562 pyrotechnic composition and investigation of its thermo kinetic parameters

Babar

Malik

2016

Fire and Materials

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Summary Pyrotechnics are used to produce some special effects in various military and civilian applications. High temperatures and elevated humidity levels influence the thermal decomposition and kinetic behaviour of pyrotechnics. The present work describes the effect of ageing on SR‐562 military pyrotechnic composition. The composition contains magnesium, sodium nitrate and calcium oxalate and it is used as a flare. The composition was aged for 30 days at a temperature of 70 °C and relative humidity (RH) of 70%. The experimental results show noteworthy variations in the thermal cum kinetic behaviour as well as in the morphology of the aged composition. Activation energy of the aged composition decreased to 189 kJ mol−1 from 239 kJ mol−1 for the fresh composition. Thermal decomposition temperature was found to increase by 51 °C after the ageing. X‐ray diffraction results confirm the presence of magnesium hydroxide in the aged composition showing that some of the magnesium reacted with water vapours at high temperatures. Some micro sized cracks have been seen in the scanning electron microscopy micrographs of the aged composition. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Ap yrotechnicm ixture is usually composed of one or more oxidizers with one or more reductants (fuels) [1].T he solidstate redox reactionsa ssociated with pyrotechnics mixtures are accompanied with generation of heat, light, or color, which can be applied in emergency signalling, fireworks, gas generator, and special effects devices for the entertainment industry [2][3][4].F or such ac hemical system the ignition temperature is defined as onsett emperature for ar apid, self-propagating reaction between oxidizer and fuel [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermoanalytical Investigation of Some Binary Pyrotechnic Mixtures of Ammonium Azide as Chemical Gas Generating Systems

Hosseini

Eslami

2016

Propellants Explo Pyrotec

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The conventional NaN3/oxidants gas generator pyrotechnic mixtures suffer from leaving undesirable solid residues. The presented investigation aimed to overcome this problem through mixing of NH4N3 particles with some metallic components, and to introduce some new gas generator pyrotechnic mixtures. In this work, volatile ammonium azide particles were initially stabilized via microencapsulation technique, and blended with Zr, Ti, ZrH2, and TiH2 powders to produce different gas generation mixtures. Thermal properties and kinetic parameters of these pyrotechnic mixtures were investigated by using thermal analysis (TG/DTA and DSC) techniques. The apparent activation energy (E), ΔG#, ΔH#, ΔS#, and critical ignition temperature (Tb) of the ignition processes of the mixtures were obtained from the DSC experiments. Among the investigated mixtures, NH4N3/ZrH2 composition was found to show desirable efficiency, and also it can be considered as a safe pyrotechnic composition for gas generation property, due to its moderate ignition temperature.

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Thermoanalytical investigation of relative reactivity of some nitrate oxidants in tin-fueled pyrotechnic systems

Cited by 40 publications

References 24 publications

Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts

Thermal Decomposition and Kinetics Studies of AN, KDN and Their Mixtures with and without Catalysts

Accelerated ageing of SR‐562 pyrotechnic composition and investigation of its thermo kinetic parameters

Thermoanalytical Investigation of Some Binary Pyrotechnic Mixtures of Ammonium Azide as Chemical Gas Generating Systems

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