A study of Thermal Decomposition and Kinetic Evaluation of Boron blended Flash Powder Composition

2021 ◽  
pp. 1-9
Author(s):  
A Azhagurajan ◽  
L Prakash ◽  
K Jeyasubramanian
Keyword(s):  
Thermal Decomposition ◽  
Powder Mixture ◽  
Manufacturing Process ◽  
Ignition Temperature ◽  
Thermal Characteristics ◽  
Potassium Nitrate ◽  
Dsc Analysis ◽  
Kinetic Evaluation ◽  
Powder Composition ◽  
Critical Ignition

Abstract Herein, the thermal characteristics of flash powders of different combinations of Potassium Nitrate, Sulphur, Aluminium and Boron are reported. From the literature, it is identified that Boron implements lack of sensitiveness to flash powder mixture, which promotes the safety during the manufacturing process. But the thermal behaviour of the Boron blended compositions remain a mystery. Hence, various combinations of flash powder compositions are prepared by keeping the % of KNO3 and % of S as constant, and gradually 23% of Aluminium is reduced (23% to 0) by increasing the quantity of Boron (0 to 23%) in 19 trials, and are subjected to TGA/DSC analysis individually. The TGA and the DSC analysis reveals that the 65.65% replacement of Aluminium with Boron mixture shows predominant characteristics which is suitable for fireworks. Also, the reaction kinetics and the critical ignition temperature are calculated for the optimum composition. The performance of the fireworks product is checked with varying quantity to meet out the optimum quality.

scholarly journals EXPERIMENTAL RESEARCH OF THERMAL DISPOSAL OF CERTAIN PHARMACEUTICAL WASTE

2017 ◽  
pp. 53-60
Author(s):  
V.V. Alekseenko ◽  
O.B. Sezonenko ◽  
O.O. Vasechko ◽  
V.Yu. Nikitin
Keyword(s):  
Thermal Decomposition ◽  
Working Conditions ◽  
Ignition Temperature ◽  
Phase Transfer ◽  
Thermal Characteristics ◽  
Relative Mass ◽  
Modern State ◽  
Thermal Methods ◽  
Pharmaceutical Waste

The modern state of problem of treatment of pharmaceutical waste in Ukraine was considered. The principles of classification of pharmaceutical waste were presented. The value of quantity of primary and secondary packaging in certain samples of pharmaceutical waste was presented and influence of packaging upon character of process of thermal disposal of pharmaceutical waste was considered. The influence of change of mass of certain samples of pharmaceutical waste during their heating was investigated. The phase transfer of certain pharmaceutical waste during their heating was considered. The dependence of velocity of loss of relative mass of sample on hold-up time in combustion chamber at the temperature of 850 °С was presented. The ignition temperature and self-ignition temperature of certain samples of pharmaceutical waste were identified. The calorific values of number of samples of pharmaceutical waste were defined. The calorific values of number of samples of pharmaceutical waste were defined. The suitability of pharmaceutical waste for disposal by thermal methods was evaluated. A number of thermal characteristics of certain pharmaceutical waste, required for the development of equipment and working conditions of thermal disposal, was identified The character of the process of thermal decomposition of certain pharmaceutical waste at high temperatures of disposal was researched. Bibl. 8, Fig. 4, Tab. 4.

scholarly journals Effect of boron on HEM radiant ignition characteristics

2021 ◽  
Vol 2057 (1) ◽  
pp. 012062
Author(s):  
A G Korotkikh ◽  
I V Sorokin
Keyword(s):  
Ignition Temperature ◽  
High Energy ◽  
Butadiene Rubber ◽  
Radiant Heating ◽  
Energy Materials ◽  
High Energy Materials ◽  
Bimetallic Systems ◽  
Critical Ignition ◽  
Boron Particles ◽  
Ignition Characteristics

Abstract The paper presents the ignition characteristics of high-energy materials (HEMs) containing ammonium perchlorate, butadiene rubber, and a mixture of Al/B nanopowders with different component ratios. Bimetallic systems based on aluminum with boron increase the reactivity and intensify the ignition of boron particles, which helps to decrease the critical ignition conditions of HEMs during heating. It is shown that the use of systems based on aluminum-boron reduces the delay time (by 17–52 %) and the ignition temperature of propellants in comparison with a HEM containing aluminum powder, and increases the activation energy of HEM during radiant heating.

scholarly journals The Temperature Dependence of the Isotope Effect for Electromigration of Potassium Ions in Molten Potassium Nitrate

1968 ◽  
Vol 23 (11) ◽  
pp. 1779-1782
Author(s):  
Arnold Lundén ◽  
Alf Ekhed
Keyword(s):  
Thermal Decomposition ◽  
Temperature Dependence ◽  
Isotope Effect ◽  
Separation Factor ◽  
Mass Effect ◽  
Potassium Nitrate ◽  
Relative Difference ◽  
Potassium Ions ◽  
Heavy Isotope ◽  
Significant Enrichment

The relative difference (Δb/b) between the electromigration mobilities of 39K and 41K in molten KNO3 has been measured over the range 354° to 586°C. The mass effect, μ= (Δb/b)/(Δm/m), becomes larger when the temperature is increased, following the relation—,u =0.0385+0.000124 (t-337)where t is the temperature in °C. Due to thermal decomposition, the nitrate is partly converted to nitrite, but it is proved by performing experiments with different initial concentrations of nitrite, that the isotope effect for potassium is not influenced noticeably by the concentration of the anions.The experiment is designed to give an enrichment of the heavy isotope 41K in a small anode compartment and in the upper part of the separation tube. However, it was possible to establish that a slight, but significant, enrichment of the light isotope 39K was obtained in the lower part of the separation tube, i. e. just above the opening into the large cathode compartment. A separation factor of 1.003 was estimated for this enrichment effect, which is due to non-ideal conditions of the experiment.

Critical Ignition Temperature of Fuel-air Explosive

2004 ◽  
Vol 54 (4) ◽  
pp. 469-474
Author(s):  
Qi Zhang ◽  
Chun Hua Bai ◽  
Hai Yan Dang ◽  
Hua Yan
Keyword(s):  
Ignition Temperature ◽  
Critical Ignition

Molten lithium nitrate-potassium nitrate eutectic: the reaction of chromium(II) chloride

1982 ◽  
Vol 35 (11) ◽  
pp. 2353 ◽  
Author(s):  
DH Kerridge ◽  
SA Tariq
Keyword(s):  
Thermal Decomposition ◽  
Melting Point ◽  
Potassium Nitrate ◽  
Lithium Nitrate ◽  
Gaseous Nitrogen ◽  
Chromium Vi ◽  
Yellow Solution ◽  
Molten Lithium ◽  
Green Precipitate ◽  
Orange Solution

The strong reducing agent chromium(II) chloride reacted rapidly in molten lithium nitrate-potassium nitrate, at or above the melting point of the eutectic, initially forming a dark-brown-black solution [probably containing chromium(III) and chromium(VI)] and gaseous nitrogen dioxide, but at 200�C giving a green precipitate (Cr2O3) and an orange solution of dichromate. Above 450�C, a further slow reaction converted both compounds into a yellow solution of chromate(VI) containing nitrite partly formed by thermal decomposition of the nitrate.

scholarly journals Impact of lattice inclusion of Cu and Fe ions on thermal decomposition characteristics of ammonium perchlorate

2020 ◽  
Vol 2 ◽  
pp. e1
Author(s):  
Savitha Nair ◽  
Suresh Mathew ◽  
Reghunadhan C.P. Nair
Keyword(s):  
Thermal Decomposition ◽  
Ammonium Perchlorate ◽  
Thermal Characteristics ◽  
Ionic Species ◽  
Decomposition Temperature ◽  
Solid Rocket Propellant ◽  
Ballistic Properties ◽  
Solid Rocket ◽  
The Impact ◽  
Fe Ions

Ammonium perchlorate (AP) is the universal oxidiser in use for all the solid rocket propellant motors used for space exploration due to its high available oxygen content and thermal decomposition without any solid residue. The inclusion of reactive species in AP directly affect the viscoelastic and ballistic properties of the propellant. Variations in lattice configuration of AP change its physical and thermal characteristics dramatically. In the present work AP was doped with Copper perchlorate and Iron perchlorate through co crystallisation. The impact of inclusion of these ionic species in the lattice on the thermal decomposition characteristics of AP was examined. The incorporation affected the physical as well as the ballistic characteristics of the resultant AP. The incorporation of foreign ions into AP crystals significantly changed the crystal morphology. The decomposition temperature decreased vis-a-vis with normal AP. The activation energy remarkably decreased for the doped AP crystals.

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