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I added a bit about the use of cermets as future spacecraft shielding. I saw it on a science news show once, and it was very impressive. A high speed impactor completely destroyed a series of five one inch thick aluminum plates, a smaller number of steel plates (four IIRC), and only managed to severely mangle the first cermet plate (It was not breached).
I am trying to find a link to something about it and as soon as I find it, I'll add the link.