COMPONENT HAVING A CERAMIC BASE THE SURFACE OF WHICH IS METALIZED
A component having a ceramic base the surface of which is covered in at least one area by a metalized coating, the ceramic base being spatially structured and the partial discharge resistance between at least two layers of a metalized structure produced from the same or different materials and between the layer of a metalized structure and the ceramic being <20 pC.
1 . A component having a ceramic body which is covered in at least one region on its surface with a metallized coating, wherein the partial-discharge resistance between at least two layers of a metallized coating of the same kind of or different materials as well as between the layer of a metallized coating and the ceramic material is <20 pC, and in that the ceramic body is spatially structured.
2 . A component according to claim 1 , wherein defects forming cavities at the transition between two metallized coatings, at the transition between a metallized coating and the ceramic body and also at the transition between a connected component and the metallized coating do not go beyond a diameter of 100 μm and a height of 100 μm.
3 . A component according to claim 1 , wherein defects formed by the structured metallized coating in the form of projections or recesses on the surface of the component have an edge course whose radius of curvature does not fall short of 10 μm.
4 . A component according to claim 1 , wherein metals in the form of coatings or foils or metal sheets are connected as the metallized coating to the ceramic body over the whole or part of the surface in a substance-locking manner or by means of mechanical form-locking, the metals having the same or different thermal conductivity as or from the carrier body.
5 . A component according to claim 1 , wherein the metallized coating consists of tungsten, silver, gold, copper, platinum, palladium, nickel, aluminium or steel of pure or industrial quality or of mixtures of at least two different metals or, additionally or merely, consists of reaction solders, soft solders or hard solders.
6 . A component according to claim 1 , wherein adhesion-promoting substances or other additives are added to or used to coat the metals of the metallized coating in the form of coatings or foils or metal sheets.
7 . A component according to claim 1 , wherein the metallized coating on the ceramic body consists of at least one layer, and in that this layer is put on the surface of the body on opposing or adjacent faces with the use of a Direct Copper Bonding (DCB) method or an Active Metal Brazing (AMB) method or a screen-printing method or an electrolytic method or chemical deposition or a vaporization method or by means of adhesion or gluing or a combination of these methods.
8 . A component according to claim 1 , wherein the metallized coating as a metal body covers over the surface of the ceramic body over part of or the whole surface or partly or completely in a plane-parallel or almost plane-parallel form or in a manner protruding in any geometrical form or in combinations of the forms.
9 . A component according to claim 1 , wherein applied to at least one metallized coating on the ceramic body there is at least one further metallized coating which covers over part of or the whole surface thereof.
10 . A component according to claim 1 , wherein the layer thickness of a metallized coating lies below 2 mm.
11 . A component according to claim 1 , wherein one or more metallized coatings on the ceramic body comprises or consists of copper, and in that the connection with the ceramic body is effected by means of the screen-printing method with subsequent thermal treatment or the DCB method.
12 . A component according to claim 1 , wherein one or more metallized coatings on the ceramic body is or are just of aluminium, and in that the connection with the ceramic body is effected by means of the screen-printing method with subsequent thermal treatment or the AMB process.
13 . A component according to claim 1 , wherein the binding of the at least one metallized coating or a further metallized coating to the ceramic body is greater than 90%.
14 . A component according to claim 1 , wherein the at least one metallized coating is connected to the ceramic body with an adhesive strength of at least 12 N/cm.
15 . A component according to claim 1 , wherein the thickness of a layer of the metallized coating amounts to ≦2 mm.
16 . A component according to claim 1 , wherein an intermediate layer is put on at least one surface of the ceramic body or a metallized coating for promoting the adhesion of a further layer or a component.
17 . A component according to claim 16 , wherein the thickness of the intermediate layer amounts to ≦20 μm.
18 . A component according to claim 16 , wherein the intermediate layer comprises Al 2 O 3 .
19 . A component according to claim 1 , wherein the ceramic material contains as a main component 50.1% by weight to 100% by weight ZrO 2 /HfO 2 or 50.1% by weight to 100% by weight Al 2 O 3 or 50.1% by weight to 100% by weight AlN or 50.1% by weight to 100% by weight Si 3 N 4 or 50.1% by weight to 100% by weight BeO, 50.1% by weight to 100% by weight SiC or a combination of at least two of the main components in any combination in the specified range of proportions and also as a secondary component the elements Ca, Sr, Si, Mg, B, Y, Sc, Ce, Cu, Zn, Pb in at least one oxidation stage or compound with a proportion of ≦49.9% by weight individually or in any combination in the specified range ofproportions, and in that the main components and the secondary components, with removal of a proportion of impurities of ≦3% by weight, can be combined with each other in any combination with each other to give a total composition of 100% by weight.
20 . A component according to claim 1 , wherein the ceramic body, provided with cooling ribs, is formed as a heat sink.