MIT has an awesome open course you can download that has many of the project leaders from the Space Shuttle program discussing their respective areas. These are the folks who were there from the beginning discussing systems, structures, aero, DOD use and a bunch of other stuff. In the aerothermodynamics session it was mentioned that the shuttles nose and wing leading edges were carbon-carbon. A well known fact as the carbon-carbon could take the high heat loads and were durable. What is less well known is the carbon-carbon had little resistance to heat transfer, so to protect the underlying structure they had to have the same type of tiles as they had on the belly mounted under those panels. Kind of a heat shield from your heat shield. Here is the only pic I could find.