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Science and Technology of Energetic Materials

Vol.70, No.1 (2009)

Research paper

Study on the thermal behavior of the mixture of calcium peroxide, aluminum and polyoxymethylene (Study on rock breaking powder, Part2)(*in Japanese)
Toshiyuki Nagaishi, Youichi Sano, Shinya Sonoda, Toshihiro Mizuno,
and Hisaaki Fukui
p.10-15

Abstract

Thermal analysis, combustion pressure measurement, friction test, fall hammer test and cap sensitivity test were carried out to clarify the thermal behavior and sensitivity of the mixture of calcium peroxide, aluminum and polyoxymethylene (POM) known as a rock breaking agent. In this experiment, synthesized 80 % pure calcium peroxide was used instead of 50 % pure commercial reagent calcium peroxide. It was suggested that synthesized calcium peroxide may be stable against heat or mechanical stimuli. It was observed that POM melts at 170 ℃ and then the depolymerization occurs to form formaldehyde. In thermal analysis, the reaction between calcium peroxide and aluminum was not observed. In ignition delay test, ignition was observed for both the mixture of calcium peroxide and aluminum, and the mixture of calcium peroxide, aluminum and POM. This suggests that the ignition of POM is the rate determination step for the mixture of calcium peroxide, aluminum and POM. The pressure measurement showed that the maximum pressure for the mixture of calcium peroxide, aluminum and POM is higher than that of black powder. Each of the friction test, fall hammer test and cap sensitivity test is low for the mixture of calcium peroxide, aluminum and POM.

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Keywords

Calciumperoxide, Aluminum, Polyoxymethylene, Combustion, Sensitivity tests.

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