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US 6,114,413 AGranted
Thermally conducting materials and applications for microelectronic packaging
AssigneeInternational Business Machines Corporation
InventorsSung Kwon Kang, Sampath Purushothaman, Eva E. Simonyi
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Abstract
A conductive paste structure is is disclosed which is a combination of a polymeric material and particles, e.g. Cu, having a thermally conductive coating, e.g. Sn. Heat is applied to fuse the coating of adjacent particles. The polymeric material is a thermoplastic. The conductive paste structure is disposed between two thermally conductive surfaces, e.g.chip and substrate pads, to provide thermal interconnection and adhesion between their pads.
Claims29
A structure comprising:
- a plurality of high thermal conductivity particles;
- each of said plurality of particles including a thermally conductive, fusible coating, said coating selected from the group consisting of Sn, Zn, In, Bi and Sb, and combinations thereof;
- at least some of said particles fused to other said particles by said thermally conductive fusible coating.
A method comprising the steps of:
- providing a paste of particles having a thermally conductive coating thereon, embedded within a polymeric material, wherein said coating is selected from the group consisting of Sn, Zn, In, Bi and Sb, and combinations thereof;
- disposing said paste of particles between a first and second thermally conductive surfaces;
- heating said paste to a first temperature sufficient to fuse said coating on adjacent particles to form a network of interconnected particles with spaces therebetween;
- and
- heating said paste to a second temperature sufficient to cure or bake said polymer in said spaces.
2 more elements
A structure comprising:
- particles of copper having a coating selected from the group consisting of Sn and In;
- and
- said particles are contained within a thermoplastic polymer precursor and a solvent.
A structure comprising:
- copper powder coated with a layer of a material selected from the group consisting of Sn, In, Bi, Sb and combinations thereof mixed with a fluxing agent.
Dependencies are inferred from the claim text.