Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: magnesium-aluminium powder

Sortuj według:

Ogranicz wyniki do:

Study of Explosion Properties of the Mg-Al/PTFE Composition

Zygmunt B.

Archivum Combustionis

2007

Vol. 27 nr 1-2

1-7

The object of the research are explosive properties of the pyrotechnic composition consist of fine grade magnesium-aluminium powder (PAM) and highly dispersed polytetrafluorethylene (PTFE). The composition reveals high resistance to all mechanical and thermal impulses and is extremely sensitive to hot sparks and open fire. The burning rate of the composition changes from l cm/s to 100 m/s along with decreasing its density. Charges of the composition of density below 1g/cm3 burn so violently, that the phenomena is similar to explosion. Charges of density above 1,1 g/cm3 burn relatively rapidly and stably. The main part of the paper concerns the research of pressure impulses in the air generating after high-rate burning of the composition of bulk density. The nature of the generated pressure impulse is not that of a typical shock wave. A rise of pressure over the distance from the point of explosion to the maximum value lasts 50-100 milliseconds, while for shock waves this factor is less than a microsecond for equivalent charges. The methods of initiation of the composition influence the shape and parameters of the pressure impulse. The explanation the nature of great changes of the composition burning rate have been proposed.