Ablative Heat Shields: Materials & Uses

[Flyboy]

I know that the heat shields on space capsules today are ablative, but what are they made of? Any help would be welcome.

 

[NewScientist]

In the new X-33 the substance Iconel 617 is used in the honeycomb TPS (thermal protection system). Generally, Nextel (a ceramic) is used.

-Ns

 

[Astronuc]

http://www.centennialofflight.gov/essay/Evolution_of_Technology/reentry/Tech19.htm

http://marsrovers.jpl.nasa.gov/mission/ spacecraft _edl_aeroshell.html

The ablator itself is a unique blend of cork wood, binder and many tiny silica glass spheres. It was invented for the heat shields flown on the Viking Mars lander missions 25 years ago. A similar technology was used in the first US manned space missions Mercury, Gemini and Apollo.

from NASA's Mar's Rovers site (second link).

 

[Flyboy]

Thanks guys. I am glad you could help.