Alloy solder connect assembly and method of connection
First Claim
1. A method of forming a melted alloy connection to a faying surface of a substrate, the method comprising the steps of:
- (a) depositing a first alloy solder having a first melting point onto the faying surface;
(b) placing a second alloy solder formed of a material more compliant than the first alloy solder in contact with the first alloy solder, the second alloy solder having a second melting point greater than the first melting point; and
(c) heating the first alloy solder and the second alloy solder to a temperature between the first melting point and the second melting point sufficient to dissolve the material more compliant than the first alloy solder from the second alloy solder into the first alloy solder and transform the first alloy solder into a third alloy solder that is elementally different from the first alloy solder.
18 Assignments
0 Petitions
Accused Products
Abstract
An electronic assembly (100) includes multiple solder connections (101) coupling faying surfaces (202, 204) of two substrates (106, 108). A solder connection (201) is fabricated by reflow heating of a first, less compliant solder paste (312, 314) and a compliant preform (210) so as to cause compliant material of the preform (210) to dissolve into the solder paste (312, 314). Upon solidification of the solder paste (312, 314), blended regions (520, 522), having a gradual, changing concentration of compliant material form between resulting fillets (212, 214) and the preform (210). The blended regions (520, 522) transfer temperature induced shear stresses, caused by thermal cycling of the electronic assembly (100), from the fillets (212, 214) into the compliant preform (210).
88 Citations
27 Claims
-
1. A method of forming a melted alloy connection to a faying surface of a substrate, the method comprising the steps of:
-
(a) depositing a first alloy solder having a first melting point onto the faying surface; (b) placing a second alloy solder formed of a material more compliant than the first alloy solder in contact with the first alloy solder, the second alloy solder having a second melting point greater than the first melting point; and (c) heating the first alloy solder and the second alloy solder to a temperature between the first melting point and the second melting point sufficient to dissolve the material more compliant than the first alloy solder from the second alloy solder into the first alloy solder and transform the first alloy solder into a third alloy solder that is elementally different from the first alloy solder. - View Dependent Claims (5, 6, 7, 8)
-
-
2. A method of forming a melted alloy connection to a faying surface of a substrate, the method comprising the steps of:
-
(a) depositing a first alloy solder having a first melting point onto the faying surface; (b) placing an indium alloy solder in contact with the first alloy solder, the indium alloy solder having a second melting point greater than the first melting point; and (c) heating the first alloy solder and the indium alloy solder to a temperature between the first melting point and the second melting point sufficient to dissolve indium from the indium alloy solder into the first alloy solder and transform the first alloy solder into a third alloy solder that is compositionally different from the first alloy solder and the indium alloy solder. - View Dependent Claims (3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method of forming a melted alloy connection to a faying surface of a substrate, the method comprising the steps of:
-
(a) depositing a substantially indium-free alloy solder having a first melting point onto the faying surface; (b) placing an indium alloy solder in contact with the indium-free alloy solder, the indium alloy solder having a second melting point greater than the first melting point; and (c) heating the indium-free alloy solder and the indium alloy solder to a temperature between the first melting point and the second melting point sufficient to combine indium from the indium alloy solder into the substantially indium-free alloy solder. - View Dependent Claims (25, 26, 27)
-
Specification