Toughest ever heat shields made of springy sponge-like stuff

 作者:翁镀     |      日期:2019-03-14 02:16:00
NASA By Paul Marks The first highly compressible yet heat-resistant material for spacecraft heat shields has been developed – and in early tests, it is proving five times more resilient to vibration and shock damage than any previous material. Heat shield tiles like those used on NASA’s space shuttle, which prevented it from being incinerated on re-entry, were often found to be heavily damaged when the spacecraft landed. This made reuse of the shuttle a slow and expensive business. The damage was due to the fragile nature of the ultralight,