Abstract
There is a need for simple and reliable pyrotechnic devices for spacecraft component release. In this work, a pyrotechnic joint was formed between lapped aluminum plates, with the lower plate having a partially thermite-filled cylindrical channel axially parallel to the tool path. Using friction stir extrusion (FSE), material from the top plate flowed into the channel and formed a mechanical interlock, encasing the thermite inside. Joints with various channel radii were prepared and ignited. Successful thermite reaction propagation was observed. Once this technology matures, FSE pyrotechnic joints may be an alternative to current pyrotechnic release mechanisms utilizing no moving parts.
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