Heraeus Deutschland Gmbh & Co Kg

Kai Herbst

Christian Muschelknautz

Alexander Rogg

Christina Modes

Anton Miric

Melanie Bawohl

Paul Gundel

Gabriel Zier

A copper-ceramic composite: includes a ceramic substrate containing alumina and a copper or copper alloy coating on the ceramic substrate. The alumina has a mean grain shape factor R(AlO), defined as the arithmetic mean of the shape factors R of the alumina grains, of at least 0.4.

Copper-ceramic composite

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 R(AlO), 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 R(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&#x2264;R(AlO)/R(Cu)&#x2264;2.0.

The invention relates to a copper-ceramic composite comprising: a ceramic substrate; and a copper or copper alloy coating on the ceramic substrate, the copper or copper alloy having grain sizes of 10 &#x3bc;m to 300 &#x3bc;m.

The invention relates to a copper/ceramic composite comprising&#x2014;a ceramic substrate which contains aluminum oxide, &#x2014;a coating which lies on the ceramic substrate and which is made of copper or a copper alloy, wherein the copper or the copper alloy has a particle size number distribution with a median value d, an arithmetic mean value d, and a symmetry value S(Cu)=d/d; the aluminum oxide has a particle size number distribution with a median value d, an arithmetic mean value d, and a symmetry value S(AlO)=d/d; and S(AlO) and S(Cu) satisfy the following condition: 0.7&#x2264;S(AlO)/S(Cu)&#x2264;1.4.

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Erlangen, Germany

Kai Herbst