High temperature bonding processes incorporating traces

Patent metadata

Field	Value
Publication number	US-2016339538-A1
Application number	US-201514714425-A
Country	US
Kind code	A1
Filing date	May 18, 2015
Priority date	May 18, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

A method for high temperature bonding of substrates may include providing first and second substrates and forming at least one trace onto one or more adjacent surfaces of the substrates. The trace may include at least a first configuration of a material having a high melting temperature. The material may include at least one or more chemical elements selected from a group consisting of nickel, silver, aluminum, and copper. The method may further include depositing tin on a top surface of the trace and bonding the substrates together to create a bond layer using a high temperature bonding process. The top surface of the trace may be disposable between the substrates. The trace may be incorporated into the bond layer that is dispersed between aligned and adjacent surfaces of the substrates. The first configuration may form one or more intermetallic bonds in the bond layer.

First claim

What is claimed is:

1 . A method for high temperature bonding of substrates, the method comprising:
providing a first substrate and a second substrate; forming at least one trace onto one or more adjacent surfaces of the first and second substrates, wherein the at least one trace comprises at least a first configuration of a material having a high melting temperature. wherein the material comprises at least one or more chemical elements selected from a group consisting of nickel, silver, aluminum, and copper; depositing at least a first amount of tin on a top surface of the at least one trace, wherein the top surface of the at least one trace is disposable between and facing at least one of the first substrate and the second substrate; and bonding the first and second substrates together to create a bond layer using a high temperature bonding process, wherein the at least one trace is incorporated into the bond layer that is dispersed between aligned and adjacent surfaces of the first and second substrates, and wherein the first configuration forms one or more intermetallic bonds in the bond layer.

2 . The method of claim 1 , wherein forming the at least one trace comprises printing the first configuration of the at least one trace directly onto the one or more adjacent surfaces of the first and second substrates.

3 . The method of claim 2 , wherein printing comprises utilizing a 3D printing process.

4 . The method of claim 1 , wherein forming the at least one trace comprises etching the first configuration of the at least one trace onto the one or more surfaces of the first and second substrates.

5 . The method of claim 4 , wherein at least one of the first substrate or second substrate comprises a direct bonded copper substrate.

6 . The method of claim 1 , wherein the high temperature bonding process comprises one of a transient liquid phase soldering or a diffusion soldering.

7 . The method of claim 1 , wherein the first configuration comprises a hexagon.

8 . The method of claim 1 , wherein the first configuration comprises at least one of a spiral configuration or a circular configuration.

9 . The method of claim 1 , wherein:
the first configuration comprises at least one of a square configuration or a radial configuration; and the radial configuration comprises a circular inner portion and a plurality of outer linear portions disposed around an outer perimeter of the circular inner portion and extending away from the circular inner portion.

10 . The method of claim 1 , wherein the bond layer has a thickness in a range of from about 10 μm to 200 μm.

11 . The method of claim 1 , wherein the material of the at least one trace comprises a weight percent in the range of from about 20% to about 40% and the tin comprises a respective weight percent in the range of from about 80% to about 60%.

12 . The method of claim 1 , wherein depositing the at least a first amount of tin on the top surface of the at least one trace comprises at least one of coating with tin, applying foils comprising tin, or applying a powder comprising tin.

13 . The method of claim 12 , further comprising depositing the at least a first amount of tin onto one or more adjacent surfaces of the first and second substrates via at least one of coating with tin, applying foils comprising tin, or applying the powder comprising tin.

14 . The method of claim 1 , wherein depositing the at least a first amount of tin on the top surface of the at least one trace comprises depositing a mesh tin pattern.

15 . The method of claim 1 , wherein:
forming the at least one trace onto one or more adjacent surfaces of the first and second substrates comprises depositing the at least one trace onto adjacent surfaces of the respective first and second substrates to form the first configuration on the first substrate surface and a second configuration on the second substrate surface, wherein:
the second configuration comprises a second configuration material having a high melting temperature; and
the second configuration material comprises at least one or more chemical elements selected from a group consisting of nickel, silver, aluminum, and copper;
depositing the at least a first amount of tin on the top surface of the at least one trace comprises depositing the at least a first amount of tin on a top surface of the first configuration and atop surface of the second configuration such that the at least a first amount of tin is disposed between the first and second substrates; and the top surface of the first configuration faces the second substrate and the top surface of the second configuration faces the first substrate.

16 . The method of claim 15 , wherein the at least a first amount of tin is disposed between the top surfaces of the first configuration and the top surface of the second configuration and is spaced away from the first substrate surface and the second substrate surface, wherein the first configuration is substantially aligned with and disposed above the second configuration.

17 . The method of claim 16 , wherein:
the first configuration and the second configuration form a. substantially matching configuration; and the substantially matching configuration is selected from a group consisting of hexagonal, circular, spiral, square, and radial, wherein the radial configuration comprises a circular inner portion and a plurality of outer linear portions disposed around an outer perimeter of the circular inner portion and extending away from the circular inner portion.

18 . The method of claim 1 , wherein:
the first substrate comprises at least one or more chemical elements selected from a group consisting of nickel, silver ink, and copper; and the second substrate comprises at least one or more chemical elements selected from a group consisting of nickel, silver ink, and copper.

19 . A bonding assembly comprising:
a first bonding assembly comprising:
a first substrate and a second substrate, wherein each of the first substrate and the second substrate comprises at least one or more chemical elements selected from a group consisting of nickel, silver, aluminum, and copper;
at least one trace formable onto one or more adjacent surfaces of the first and second substrates, wherein:
the at least one trace comprises at first configuration of a material having a high melting temperature; and
the material comprises at least one or more chemical elements selected from a group consisting of nickel, silver ink, and copper; and

at least a first amount of tin depositable on a top surface of the at least one trace, wherein:
the top surface is disposable between and facing at least one of the first substrate and the second substrate prior to bonding, and the at least one trace is incorporated into a bond layer after using a high temperature bonding process;
the high temperature bonding process comprises one of transient liquid phase soldering or a diffusion soldering;
the bond layer bonds the first and second substrates together and is dispersed between aligned and adjacent surfaces of the first and second substrates; and
the first configuration forms one or more intermetallic bonds in the bond layer.

20 . The bonding assembly of claim 19 , wherein:
the first configuration comprises one or more shapes; and at least one of the one or more shapes is selected from a group consisting of hexagonal, circular spiral, square, and radial; wherein the radial shape comprises a circular inner portion and a plur

Assignees

• Toyota Motor Eng & Mfg North America Inc

Inventors

• Joshi Shailesh N
• Noguchi Masao

Classifications

• B23K20/026 Primary

  with diffusion of soldering material · CPC title

• B23K35/0233

  Sheets or foils (B23K35/0244 takes precedence) · CPC title

• B23K35/262

  Sn as the principal constituent · CPC title

• C22C13/00

  Alloys based on tin · CPC title

• B23K1/00

  Soldering, e.g. brazing, or unsoldering (B23K3/00 takes precedence) · CPC title