now we are getting waaay off topic... but I just can't help myself... the armour used in tanks etc. to defeat projectile weapons... I would have thought that it would be a multi-layered composite - like extra heavy duty kevlar... with layers including MMC (metal matrix composites)... there are plenty of materials with both toughness and strength and high temperature properties that are cheap enough for an advaned army... Tantalum wire wrapped ceramic composites for instance would have excellent toughness and strength... and resist temoperatures in excess of 2000 oC
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