Electrical contact composites and method for producing electrical contact composites
An electrical contact composite is described. The electrical contact composite has a substrate and an electrically conductive coating applied to the substrate, which coating is connected to an electrode. A metal contact element is connected to the electrode, which contact element is used to connect the conductive coating to a current/voltage source. Furthermore, at least one sprayed layer produced by means of a thermal spraying method, in particular gas dynamic cold spray, and is provided with at least one metal and/or metal alloy, the sprayed layer being arranged between the conductive coating and the contact element. The sprayed layer has a coefficient of thermal expansion that is between the coefficients of thermal expansion of the carrier and of the contact element. The sprayed layer can also be used as the electrode for the conductive coating.
1. An electrical contact composite, comprising, in order:
a flat substrate with an electrically conductive coating applied thereon,
an electrode that is electrically connected to the conductive coating and mechanically connected to the conductive coating by way of a printing method,
a sprayed layer that is produced by a thermal spraying method onto the electrode,
a solder layer; and
a metal contact element that is electrically connected to the electrode and mechanically connected to the sprayed layer by way of the solder layer, the metal contact element serving for electrical connection of the conductive coating to an electrical component,
wherein said sprayed layer comprises at least one metal and/or at least one metal alloy, and
wherein the sprayed layer contains at least one electrically insulating material.
2. The contact composite according to claim 1 , wherein a coefficient of thermal expansion of the sprayed layer is in a range of a middle third of a value range for coefficients of thermal expansion bounded by coefficients of thermal expansion of the flat substrate and the contact element.
3. The contact composite according to claim 2 , wherein the coefficient of thermal expansion of the sprayed layer corresponds at least approximately to a mean value formed from the coefficients of thermal expansion of the flat substrate and the contact element.
4. The contact composite according to claim 1 , wherein the sprayed layer has a layer thickness 2 to 50 times that of the electrode.
5. The contact composite according to claim 1 , wherein the sprayed layer comprises one or a plurality of metals and/or metal alloys, selected from silver, copper, gold, aluminum, sodium, tungsten, brass, iron, chromium, lead, bismuth, titanium, tin, zinc, molybdenum, indium, nickel, platinum, vanadium, cobalt, thallium, and niobium.
6. An electrical structure with a flat substrate and an electrically conductive coating applied on the flat substrate, the electrical structure comprising at least one electrical contact composite according to claim 1 .