Ablative Heat Shields: Materials & Uses

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Discussion Overview

The discussion focuses on the materials used in ablative heat shields for space capsules, exploring both historical and contemporary examples. Participants seek to understand the composition and evolution of these materials in the context of thermal protection systems (TPS).

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • One participant inquires about the materials used in modern ablative heat shields.
  • Another participant mentions that Iconel 617 is used in the honeycomb TPS of the X-33, along with Nextel, a ceramic material.
  • A third participant provides links to resources and describes a specific ablator made from a blend of cork wood, binder, and silica glass spheres, noting its historical use in the Viking Mars lander missions and earlier US manned space missions.

Areas of Agreement / Disagreement

Participants share information about different materials used in ablative heat shields, but no consensus is reached on a singular material or approach, as multiple examples and sources are presented.

Contextual Notes

The discussion includes references to specific materials and historical contexts, but lacks detailed technical specifications or comparisons of performance among the materials mentioned.

Who May Find This Useful

Individuals interested in aerospace engineering, materials science, or the history of space exploration may find this discussion relevant.

Flyboy
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I know that the heat shields on space capsules today are ablative, but what are they made of? :confused: Any help would be welcome.
 
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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
 
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).
 
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Thanks guys. I am glad you could help.:biggrin:
 

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