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Hello to everyone, I'm new into this forum.

Why does aluminum react exothermically with palladium?
http://en.wikipedia.org/wiki/Pyrotechnic_initiator

   Palladium-aluminium

    Palladium-clad aluminium wires can be used as a fuse wire, known as Pyrofuze. The reaction is initiated by heat, typically supplied by electric current pulse. The reaction begins at 600 °C, the melting point of aluminium, and proceeds violently to temperature of 2200-2800 °C. The reaction does not need presence of oxygen, and the wire is consumed.

There is also a video:
http://www.youtube.com/watch?v=uiLUjlvau38