High-temperature exothermic device
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United States of America Patent
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Oct 3, 1995
Issued Date -
N/A
app pub date -
Oct 14, 1994
filing date -
Oct 14, 1994
priority date (Note) -
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Abstract
Proposed is a compact high-temperature exothermic device by utilizing the heat of reaction of a reactive metal powder, e.g., titanium and zirconium, and a powder of boron and/or carbon mixed together in about the stoichiometric proportion forming a calorific mixture. The exothermic device is constructed by filling a hermetically sealable container of a metallic or ceramic material with the calorific mixture which is contacted at one end portion with an ignition means to cause ignition of the calorific mixture by supplying, for example, electric energy. The ignition means can be hermetically sealed in the container and the electric circuit of the ignition means comprises a switching means with a coil spring consolidated with a solder alloy in a constricted state in such a fashion that, when the solder alloy is melted down by heating from outside, the coil spring is released to close the electric circuit by bringing a contact point held thereon into contact with a couterpart contact point.
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