Conductive adhesive bonding means
First Claim
1. A method of electrically and mechanically bonding a conductive surface made of a material on which unstable oxides form to a target surface using a conductive adhesive, the method comprising the steps of:
- a. preparing the conductive surface so that a microscopically rough surface is formed to insure a substantially strong mechanical bond, said microscopically rough surface being coated with an oxide layer;
b. placing the conductive adhesive between said microscopically rough surface and the target surface to form a stack, the conductive adhesive having an amount of conductive particles that have a hardness at least as hard as said microscopically rough surface, said target surface and an underlying metal of said conductive surface, said amount insuring electrical conductivity between said underlying metal of said conductive surface and said target surface; and
c. simultaneously applying heat and pressure to said stack to cure said conductive adhesive such that said conductive particles make contact with said target surface and pierce through said microscopically rough surface to make direct contact with said conductive surface thereunder.
9 Assignments
0 Petitions
Accused Products
Abstract
A method of electrically and mechanically bonding conductive surfaces with conductive adhesives, wherein at least one of the conductive surfaces is of the type upon which unstable oxides readily form. The conductive adhesives having a predetermined amount of conductive particles. The conductive particles having a rigidity at least as hard as the materials composing the conductive surfaces and any oxide formed thereon. The bonding method including the step of preparing the conductive surfaces so that a microscopically roughened oxide surface is formed thereon. The method further including the step of simultaneously applying a predetermined amount of heat and pressure to cure the conductive surface-conductive adhesive-conductive surface joint such that the conductive particles in the conductive adhesive pierce through the oxide to make direct contact with the conductive surfaces thereunder. The method controls the mechanical strength of the bond and the electrical characteristics of the bond joint. The electrical characteristics include joint resistivity and joint sensitivity to elevated temperature and/or humidity conditions.
40 Citations
31 Claims
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1. A method of electrically and mechanically bonding a conductive surface made of a material on which unstable oxides form to a target surface using a conductive adhesive, the method comprising the steps of:
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a. preparing the conductive surface so that a microscopically rough surface is formed to insure a substantially strong mechanical bond, said microscopically rough surface being coated with an oxide layer; b. placing the conductive adhesive between said microscopically rough surface and the target surface to form a stack, the conductive adhesive having an amount of conductive particles that have a hardness at least as hard as said microscopically rough surface, said target surface and an underlying metal of said conductive surface, said amount insuring electrical conductivity between said underlying metal of said conductive surface and said target surface; and c. simultaneously applying heat and pressure to said stack to cure said conductive adhesive such that said conductive particles make contact with said target surface and pierce through said microscopically rough surface to make direct contact with said conductive surface thereunder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification