Copper-ceramic composite
AssigneeHeraeus Deutschland GmbH & Co. KG
InventorsKai Herbst, Christian Muschelknautz, Alexander ROGG
Life of this patent
Estimating the term…
Abstract
The invention relates to a copper-ceramic composite, comprising a ceramic substrate, which contains aluminum oxide, a coating on the ceramic substrate made of copper or a copper alloy, wherein the aluminum oxide has an average grain form factor Ra(Al2O3), determined as an arithmetic average value from the form factors of the grains of the aluminum oxide, the copper or the copper alloy has an average grain form factor Ra(Cu), determined as an arithmetic average of the form factors of the grains of the copper or copper alloy, and the average grain form factors of the aluminum oxide and copper or copper alloy meet the following condition: 0.5≤Ra(Al2O3)/Ra(Cu)≤2.0.
Claims9
A copper-ceramic composite comprising
- a ceramic substrate containing aluminum oxide,
- 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 diameter dKmax, a diameter dK,ortho running perpendicular to dK,max, determined on half the length of dK,max, and a shape factor RK(Al2O3)=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(Al2O3) of the grains of the aluminum oxide,
- the grains of the copper or of the copper alloy each have a maximum diameter dK,max, a diameter dK,ortho running perpendicular to dK,max, determined on half the length of dK,max, and a shape factor RK(Cu)=dK,ortho/dK,max and the copper or the copper alloy has an average grain shape factor Ra(Cu), determined as arithmetic mean of the shape factors RK(Cu) of the grains of the copper or of the copper alloy,
- where the average grain shape factors of the aluminum oxide and of the copper or the copper alloy satisfy the following condition:
- 0.5≤Ra(Al2O3)/Ra(Cu)≤2.0.
Dependencies are inferred from the claim text.