re: SR-71 doesnt face re-entry temps...
You may well be right- hell you probably are since this is far more your area of expertice than it is mine- I just remember stripping the titanium foil buildup off my Titanium sublimation pump and striking a spark into it and watching it burn in a white hot glare...
Of course the bulk material would be harder to ignite than a thin foil...
Just raising a point...
