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8 results on '"Marcin Hara"'

1. Tungsten and Copper (II) Oxide Mixtures as Gasless Time Delay Compositions for Mining Detonators

Author

Marcin Gerlich, Marcin Hara, and Waldemar A. Trzciński

Subjects
time delay compositions, detonators, solid state reactions, burning rate, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

The widespread use of pyrotechnic compositions in time delay detonators is the reason for research aimed at expanding knowledge of the combustion properties of new pyrotechnic mixtures, whose components react with each other in the solid or liquid state. Such a method of combustion would make the rate of combustion independent of the pressure inside the detonator. This paper presents the effect of the parameters of W/CuO mixtures on their properties of combustion. As this composition has not been the subject of previous research and is not described in the literature, the basic parameters, such as the burning rate and the heat of combustion, were determined. In order to determine the reaction mechanism, a thermal analysis was performed, and the combustion products were determined using the XRD technique. Depending on the quantitative composition and density of the mixture, the burning rates were between 4.1–6.0 mm/s and the heat of combustion in the range of 475–835 J/g was measured. The gas-free combustion mode of the chosen mixture was proved using DTA and XRD. Determination of the qualitative composition of the combustion products and the heat of combustion allowed estimation of the adiabatic combustion temperature.

Published
2023
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2. Some Aspects of the Burning Process of Antimony and Potassium Manganate(VII) Compositions

Author

Marcin Gerlich, Waldemar Trzciński, and Marcin Hara

Subjects
delay composition, burn rate, gasless combustion, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

Antimony and potassium manganate(VII) compositions are widely used in time delay elements of detonators. Despite the existing literature on such systems, there is no complete information on the burning process of Sb/KMnO4 compositions in closed systems. There are also no data on the heat of their combustion in conditions of increased pressure without the access of oxygen from the air and on the composition of solid combustion products. These issues are the subject of the presented work.

Published
2022
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4. Some Aspects of the Burning Process of Antimony and Potassium Manganate(VII) Compositions

Author

Waldemar Trzciński, Marcin Hara, and Marcin Gerlich

Subjects
delay composition, burn rate, gasless combustion, General Materials Science
Abstract

Antimony and potassium manganate(VII) compositions are widely used in time delay elements of detonators. Despite the existing literature on such systems, there is no complete information on the burning process of Sb/KMnO4 compositions in closed systems. There are also no data on the heat of their combustion in conditions of increased pressure without the access of oxygen from the air and on the composition of solid combustion products. These issues are the subject of the presented work.

Published
2022

7. Synthesis of nitrogen-rich compounds and their use in novel composite propellants

Author

Leszek Szymańczyk, Marcin Hara, Mateusz Szala, and Zbigniew Surma

Subjects
Propellant, chemistry.chemical_compound, Thermogravimetric analysis, animal structures, Materials science, chemistry, Chemical engineering, Dibutyl phthalate, Differential thermal analysis, Composite number, Plasticizer, Volatility (chemistry), Nitrocellulose
Abstract

High-nitrogen azotetrazole salts were synthesized, characterized and used as nitrogen-rich compounds for the preparation of novel composite propellants. Triaminoguanidinium and guanidinium azotetrazolate (TAGAZ, GUAZ) were selected based on the results of thermic and sensitivity measurements. Nitrocellulose was used as a traditional ingredient of propellants, while dibutyl phthalate and 3-methyl-3-nitroxymethyloxetane (NIMMO) was used as a plasticizer. The ingredients and resulting propellants were tested using differential thermal analysis coupled with a thermogravimetric method. Standard pyrostatic tests in a closed chamber were also conducted and characteristic ballistic parameters were calculated. Both of the high-nitrogen compounds that were tested could be potential ingredients of future propellants. The pressure rise rate for the tested propellants is simply correlated with the amount of TAGAZ/GUAZ. NIMMO is an interesting new plasticizer for nitrocellulose, although it exhibits relatively high volatility during DTA-TG tests which limits its utility.

Published
2020

8. Preliminary Study of New Propellants Containing Guanidinium or Triaminoguanidinium Azotetrazolate

Author

Leszek Szymańczyk, Mateusz Szala, Marcin Hara, and Zbigniew Surma

Subjects
Propellant, animal structures, Materials science, 010304 chemical physics, Dibutyl phthalate, musculoskeletal, neural, and ocular physiology, General Chemical Engineering, technology, industry, and agriculture, Plasticizer, macromolecular substances, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, body regions, chemistry.chemical_compound, chemistry, Friction sensitivity, 0103 physical sciences, Polymer chemistry, 0210 nano-technology, Nitrocellulose, Maximum pressure, Nuclear chemistry
Abstract

Guanidinium and triaminoguanidinium azotetrazolate (GUAZ, TAGAZ) were used as high-nitrogen compounds for the preparation of new propellants bound with nitrocellulose and plasticized with dibutyl phthalate and 3-methyl-3-nitroxymethyloxetane. The new propellant compositions were tested by using a differential thermal analysis-thermogravimetric technique, friction sensitivity and impact were ascertained and pyrostatic tests were conducted. Regardless of the amount of TAGAZ and plasticizer type, the propellants exhibit similar maximum pressure of the gases which allow for the replacement of NC in propellants by TAGAZ.

Published
2017

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