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US 6,326,685 B1Granted
Low thermal expansion composite comprising bodies of negative CTE material disposed within a positive CTE matrix
AssigneeAgere Systems Guardian Corp.
InventorsSungho Jin, Hareesh Mavoori
Life of this patent
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Abstract
A reduced CTE composite structure is made by providing a matrix material whose CTE is to be reduced, adding negative CTE bodies to the matrix material and mechanically coupling the matrix material to the negative CTE bodies as by deforming the composite structure. A preferred application is to make an improved composite material for use as a heat sink for semiconductor substrates with a minimum of thermal expansion mismatch.
Claims10
A composite structure comprising:
- a matrix material having a positive coefficient of thermal expansion (CTE);
- and
- disposed within said matrix material, a plurality of bodies of a material having a negative coefficient of thermal expansion comprising an alloy selected from the group consisting of Ni—Ti, Cu—Al—Ni, Cu—Zn—Al, Au—Cu—Zn, Cu—Zn—Si, Cu—Zn—Sn and Cu—Sn, said bodies mechanically coupled to said matrix material whereby said composite structure exhibits in at least one direction a reduced coefficient of thermal expansion as compared with said matrix material.
Dependencies are inferred from the claim text.