Patent ID: 11969796
Assignee: THE BOEING COMPANY
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 0:
1. A graded multilayered composite, comprising:
a sintered metal matrix material, having a first edge on a first side of the sintered metal matrix material and a second edge on a second side of the sintered metal matrix material, opposite the first side, the sintered metal matrix material having a sintered metal matrix throughout the sintered metal matrix material from the first edge to the second edge;
a first layer of hollow microspheres, located on the first side of the sintered metal matrix material;
a second layer of hollow microspheres, located on the second side of the sintered metal matrix material; and
one or more cooling channels in the sintered metal matrix material between the first edge and the second edge,
wherein:
hollow microspheres of the first layer of hollow microspheres are spatially distributed relative to each other according to a first spatial gradation, each hollow microsphere having a void therein defining a void volume,
hollow microspheres of the second layer of hollow microspheres are spatially distributed relative to each other according to a second spatial gradation, each hollow microsphere having a void therein defining a void volume,
the first spatial gradation is based upon one of a number of the hollow microspheres in the first layer of hollow microspheres or a size of the hollow microspheres in the first layer of hollow microspheres, and
the second spatial gradation is based upon one of a number of the hollow microspheres in the second layer of hollow microspheres or a size of the hollow microspheres in the second layer of hollow microspheres,

wherein a total void volume fraction of the second layer is less than a total void volume fraction of the first layer.