Electronic power module, and method for manufacturing said module
Said electronic power module ( 10 ) includes: a stack ( 14 ) comprising a metal layer forming an electric circuit ( 26 ) and intended for supporting an electronic power component ( 18 ) such as a semiconductor; a metal body forming a heat drain ( 20 ); and a dielectric material layer ( 22 ) forming an electric insulator and inserted between the electric circuit ( 26 ) and the heat drain ( 20 ). The stack ( 14 ) includes a composite material body ( 24 ) having a carbon-charged metal matrix. The carbon charge is between 20 and 60 volume percent. Said composite body ( 24 ) is inserted between an area of the electric circuit ( 26 ) and the electric insulator ( 22 ), said area being intended for supporting the electronic power component ( 18 ).
1. A power electronic module, comprising: a stack, comprising:
a metal layer forming an electrical circuit for carrying a power electronic component;
a metal mass forming a heat sink;
a layer of dielectric material forming an electrical insulator interposed between the electrical circuit and the heat sink; and
a mass of composite material with a carbon-loaded metal matrix, the carbon loading being in a range between 20% and 60% by volume, the mass of composite material being interposed between a region of the electrical circuit and the electrical insulator,
wherein the mass of composite material forms an insert in the metal layer forming the electrical circuit.
2. The module as claimed in claim 1 , in which the metal matrix comprises copper or aluminum and the carbon loading comprises one selected form a group consisting of short graphite fibers comprising a length less than 30 μm, graphenes or exfoliated graphite.
3. The module as claimed in claim 1 , wherein the layer of dielectric material comprises silicone and a loading which improves thermal conductivity of the layer of dielectric material.
4. The module as claimed in claim 1 , further comprising a clamping means that rigidly hold elements of the stack together.
5. The module as claimed in claim 4 , further comprising a housing accommodating at least part of the electrical circuit, the housing being formed at least in part by the stack and by a housing body, wherein the clamping means rigidly hold the housing body and the stack together.
6. A method for the manufacture of a power electronic module as claimed in claim 1 , the method comprising:
forming a sub-assembly, the sub-assembly comprising:
the metal layer designed to form the electrical circuit; and
the mass made of composite material; and
forming the stack by stacking the sub-assembly, the layer of dielectric material, and the heat sink,
wherein the mass of composite material is interposed between the region of the electrical circuit designed to carry the power electronic component and the electrical insulator, and
wherein the mass of composite material forms an insert in the metal layer forming the electrical circuit.
7. The method as claimed in claim 6 , in which formation of the composite material comprises:
mixing a powdered metal with a carbon load;
depositing a layer of the mixed powdered metal and carbon load into a mold; and
sintering the mixed powdered metal and carbon load by heating the mixed powdered metal and carbon load to a temperature in a range between, depending on the metal, 400° C. and 1100° C., preferably in a range between 400° C. and 900° C., and by compressing the mixed powdered metal and carbon load at a pressure in a range between 10 MPa and 80 MPa, preferably in a range between 50 MPa and 80 MPa.
8. The method as claimed in claim 7 , in which the stack sub-assembly is formed by co-laminating the composite mass with the metal layer designed to form the electrical circuit.
9. The method as claimed in claim 7 , further comprising:
depositing a powdered metal overlayer on the layer of the mixed powdered metal and carbon load,
wherein the sintering the layer of the mixed powdered metal and carbon load together further includes the powdered metal overlayer, and
wherein, after the sintering, the stack sub-assembly is obtained in which the mixture layer forms the composite material and the overlayer of powdered metal forms the metal layer designed to form the electrical circuit.
10. The method as claimed in claim 7 , further comprising:
depositing the layer of the mixed powdered metal and carbon load onto a conducting metal foil,
wherein the sintering the layer of the mixed powdered metal and carbon load together further comprises the conducting metal foil, and wherein, after the sintering, the stack sub-assembly is obtained in which the mixture layer forms the composite material and the conducting metal foil forms the metal layer designed to form the electrical circuit.