In asking this question, and researching it a little I discovered that electro-magnetic heat shields are under development. I will post the link to an article on that and the rest of my initial comment...
http://news.softpedia.com/news/New-Magnetic-Heat-Shields-Under-Development-128166.shtml
What about using a stream of plasma or an eletromagntic field from the leading end of a high speed space launch module to deflect particles that would cause friction and heat? That is, could a close plasma or electromagnetic field act as a heat shield instead of a heat resistant coating?
http://en.wikipedia.org/wiki/Plasma_(physics)
Others have considered the idea. There are numerous configurations making and shaping plasma as there are for making geometry models for calibi-yau manifolds.
http://www.physicsforums.com/archive/index.php/t-261559.html
If using an electro-magnetic accellerator to launch a space insertion module along a 30 mile launch tube in a vaccum, the spacecraft would have quite a lot of energy in it already some of which could be spent for use in a heat shield as well ass for exiting the Earth's atmosphere and gravitational field (so far as to achieve orbit).
Ablative heat shields create implicit limits on the design of space insertion modules that could be avoid with plasma or electro-magnetic shields.
http://www.economicexpert.com/a/Heat:shield.htm
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