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CAN THE PARKER SOLAR PROBE TAKE THE HEAT?ByTracy Vogel / Published Aug 6 2018
Researchers at the Applied Physics Lab develop a shield strong enough to protect the spacecraft's sensitive instruments during its mission to 'touch' the sun
IMAGE CREDIT: GREG STANLEY / OFFICE OF COMMUNICATIONS(...) The front and back faces of the heat shield are made of sheets of carbon-carbon, a lightweight material with superior mechanical properties especially suited for high temperatures. At less than a tenth of an inch thick, the two carbon-carbon sheets are thin enough to bend, even if they were laid on top of each other. Between them is about 4.5 inches of carbon foam, typically used in the medical industry for bone replacement. This sandwich design stiffens everything up—like corrugated cardboard—while allowing the 8-foot heat shield to weigh in at only about 160 pounds.
The foam also performs the heat shield's most essential structural functions. Carbon itself conducts heat, but carbon foam is 97 percent air. In addition to cutting the weight of the spacecraft to help it get into orbit, the foam structure means there's just not that much material for heat to travel through. The heat shield will be 2500 degrees Fahrenheit on the side facing the sun, but only 600 degrees Fahrenheit at the back. (...)
https://hub.jhu.edu/2018/08/06/parker-solar-probe-heat-shield-explained/
Wątek: Parker Solar Probe (Przeczytany 61079 razy)