Study on the thermal behavior of the mixture of cal- cium peroxide, aluminum and poly−oxymethylene

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―岩盤破砕剤の基礎研究第２報―

永石俊幸^＊†，佐野洋一^＊，園田真也^＊＊，水野敏博^＊＊＊，福井久明^＊＊＊＊

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†corresponding address : nagaishi@ip.kyusan-u.ac.jp

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Fig.% Ignition delay test for POM, CaO1*Al and CaO1*AlPOM.

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(4)

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Fig.' Timepressure curves of various mixtures.

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(6)

Study on the thermal behavior of the mixture of cal- cium peroxide, aluminum and poly−oxymethylene

（Study on rock breaking powder, Part２）

Toshiyuki NAGAISHI

^＊†

, Youichi SANO

^＊

, Shinya SONODA

^＊＊

, Toshihiro MIZUNO

^＊＊＊

, and Hisaaki FUKUI

^＊＊＊＊

Thermal analysis, combustion pressure measurement, friction test, fall hammer test and cap sensitivity test were car- ried 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*&$pure calcium peroxide was used instead of(&$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')&#and then the depolymerization occurs to form formaldehyde. In thermal analysis, the re- action 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.

Keywords

: calcium peroxide, aluminum, polyoxymethylene, combustion, sensitivity tests

%Faculty of Engineering, Kyushu Sangyo University, Matsukadai 2-3-1,Higashiku, Fukuoka 813-8503,JAPAN

†corresponding address : nagaishi@ip.kyusanu.ac.jp

%%CHUGOKU KAYAKU Co.Ltd,5-1-1 Kouyou, Etajimamachi, Etajimashi, Hiroshima 737-2121 JAPAN

%%%KAWAI SETSUKAI Co. Ltd, Akasakamachi 2093,Oogakishi, Gifu 503-2291,JAPAN

%%%%Rox·Japan Co. Ltd, Fuji Build.713,Marunouchi 3-2-3,Chiyodaku, Tokyo 1005-0005