Ceramite
Ceramite is a fictional material of the Warhammer 40,000 universe, used by the Imperium of Man. It is a composite made from Ceramic and Titanium.
Power Armour (but not most suits of Terminator Armor) is made from it, and vehicles making orbital drops (like Thunderhawks, Stormravens, Storm Eagles, and Stormtalons) are often plated with ceramite tiles to protect them from the heat of re-entry. This ceramite plating has the effect of protecting such vehicles from the extra armor-penetrating ability of melta weapons. The Land Raider Achilles was built with ceramite plating for just such a reason.