Method and apparatus for improving interfacial adhesion between a polymer and a metal
First Claim
1. A method for improving an interfacial adhesion between a polymer and one of a metal surface or a metal alloy surface, comprising the steps of:
- providing the one of a metal surface or a metal alloy surface;
bombarding the one of a metal surface or a metal alloy surface with a grit material, the grit material suspended in a gaseous carrier medium; and
encapsulating a portion of the one of a metal surface or a metal alloy surface with a molding compound.
1 Assignment
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Accused Products
Abstract
A leadframe (11) and a method for improving adhesion of a polymer (17, 19) to the leadframe (11). The leadframe (11) has a flag (14) having a top surface (15) and a bottom surface (18), and leads (12). Microscopic locking features (31) are formed in the top surface (15) and the bottom surface (18) of flag (14) by bombarding the flag (14) with a grit material. Thus, the top and bottom surfaces (14, 18) are roughened. A semiconductor die (13) is attached to the flag (14) by a die attach material (17) and the flag (13), the semiconductor material (13), and portions of the leads (12) are encapsulated by a molding compound. The pits improve the adhesion of the die attach material (17) and the molding compound (19) to the leadframe (11).
46 Citations
16 Claims
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1. A method for improving an interfacial adhesion between a polymer and one of a metal surface or a metal alloy surface, comprising the steps of:
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providing the one of a metal surface or a metal alloy surface; bombarding the one of a metal surface or a metal alloy surface with a grit material, the grit material suspended in a gaseous carrier medium; and encapsulating a portion of the one of a metal surface or a metal alloy surface with a molding compound. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for improving interfacial adhesion between a polymer and a semiconductor leadframe, comprising the steps of:
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providing the semiconductor leadframe; roughening a portion of the semiconductor leadframe using a grit material carried via a gaseous medium; mounting at least one semiconductor die to the semiconductor leadframe; and encapsulating the at least one semiconductor die and a portion of the semiconductor leadframe in the polymer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification