02-05-2019 дата публикации
Номер: US20190126349A1
Принадлежит:
A structured three-phase composite which include a metal phase, a ceramic phase, and a gas phase that are arranged to create a composite having low thermal conductivity, having controlled stiffness, and a CTE to reduce thermal stresses in the composite when exposed to cyclic thermal loads. The structured three-phase composite is useful for use in structures such as, but not limited to, heat shields, cryotanks, high speed engine ducts, exhaust-impinged structures, and high speed and reentry aeroshells. 1. A three- or more phase composite which includes a ceramic phase , a gas phase , and a metal phase , where said gas and ceramic phases are segregated into isolated pockets forming a discontinuous phase in said composite , said metal phase is continuous phase in said composite , said composite having a combination of compression modulus and coefficient of thermal expansion that combined to be at least 40% less than a modulus of said metal forming said metal phase , said composite also having a thermal conductivity that is at least 40% less than a thermal conductivity of said metal that forms said metal phase , said composite having a density that is at least 20% lower than a density of said metal that forms said metal phase.2. The three-phase composite as defined in claim 1 , wherein a plurality of said ceramic phase is formed of ceramic particles that include a central cavity or plurality of cavities that are filled with a portion of said gas phase.3. The three-phase composite as defined in claim 1 , wherein said ceramic phase is formed of one or more materials selected from the group consisting of carbon claim 1 , SiAlON claim 1 , SiN claim 1 , SiC claim 1 , SiOC claim 1 , SiO claim 1 , AlO claim 1 , aluminates claim 1 , zirconates claim 1 , aluminosilicates claim 1 , and ZrO4. The three-phase composite as defined in claim 1 , wherein said gas phase is a vacuum that does not include a gas or includes one or more gasses selected from the group consisting of air claim ...
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