CPC B64G 1/58 (2013.01) [B32B 15/017 (2013.01); B64G 1/543 (2013.01); B64G 1/546 (2013.01); C22C 14/00 (2013.01); C23C 4/08 (2013.01); C23C 4/134 (2016.01); C23C 4/137 (2016.01); C23C 28/028 (2013.01); G21F 1/12 (2013.01); G21F 1/125 (2013.01)] | 20 Claims |
1. An apparatus comprising a Z-grade material having multiple layers, the Z-grade material comprising:
a first layer of a first material having a higher atomic number;
a second layer of a second material having a lower atomic number; and
a third layer of a third material, wherein the third layer:
is comprised of an alloy of the first and second materials;
is positioned between the first and second layers;
is at least 0.5 mil in thickness; and
a density of material in the third layer increases along a gradient along a distance between the first layer to the second layer.
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