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US 2019/0055167 A1Published application
Copper-ceramic composite
AssigneeHeraeus Deutschland GmbH & Co. KG
InventorsKai Herbst, Chrisitan Muschelknautz
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Abstract
The invention relates to a copper-ceramic composite comprising: a ceramic substrate containing alumina; a copper or copper alloy coating on the ceramic substrate; the alumina has a mean grain shape factor Ra(Al2O3), defined as the arithmetic mean of the shape factors R of the alumina grains, of at least 0.4.
Claims8
A copper-ceramic composite comprising
- a ceramic substrate containing aluminum oxide, and
- a coating composed of copper or a copper alloy present on the ceramic substrate, wherein the grains of the aluminum oxide each have a maximum grain diameter dK,max, a grain diameter dK,ortho running perpendicular to dK,max, determined on half the length of dK,max, and a shape factor RK=dK,ortho/dK,max and the aluminum oxide has an average grain shape factor Ra(Al2O3), determined as arithmetic mean of the shape factors RK of the grains, of at least 0.4.
Dependencies are inferred from the claim text.