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    • 4. 发明公开
    • INTERFACE LAYER WITH WIRE MESH AND SINTER PASTE AND ITS USE FOR JOINING ELECTRONIC COMPONENTS
    • EP3806147A1
    • 2021-04-14
    • EP20200590.6
    • 2020-10-07
    • Aptiv Technologies Limited
    • Brandenburg, Scott D.
    • H01L23/488H01L21/60B23K35/12
    • An interface layer (20) includes an electrically conductive compressible mesh (22) having wires (22a) that are interwoven and pores (24) between the wires (22a). A dried sinter paste (26) is immobilized in the pores (24), the sinter paste (26) including electrically conductive particles (28). The wires (22a) may be copper wires. The electrically conductive particles (28) may have a composition of greater than 99% copper by weight. The mesh (22) may have a mesh size of 50-80. The wires (22a) may have a wire diameter of 0.05 millimeters to 0.5 millimeters. The mesh (22) may be a plain weave. The interface layer (20) may be fabricated by providing the mesh (22) on a carrier sheet (36); introducing the sinter paste (26) onto the mesh (22), e.g. using a screen printing process; and drying the sinter paste (26) to immobilize (interlock) the sinter paste (26) in the pores (24), for example, in a chamber at a temperature of 60 °C to 125 °C for approximately 10 minutes or more, wherein the steps above may be repeated over multiple iterations to completely fill the pores (24). A method of fabricating an electronic device (40) comprises: compressing the interface layer (20) between first and second components (32, 34) to reduce a thickness of the interface layer (20); and heating the interface layer (20) to consolidate the electrically conductive particles (28) into sintered bodies (42) in the pores (24). The heating may be conducted under an inert cover gas at a temperature of 225 °C to 300 °C. The heating may be pressureless heating or may be conducted under a pressure of 10 MPa to 40 MPa. The components (32, 34) may be uneven such that the interface surfaces of the components (32, 34) are non-parallel.