| abstract |
A copper-ceramic composite comprising - a ceramic substrate containing alumina, - a coating of copper or a copper alloy present on the ceramic substrate, the grains of the alumina each having a maximum grain diameter dK, max, a grain diameter dK perpendicular to dK, max , ortho, determined at half the length of dK, max, and having a shape factor RK = dK, ortho / dK, max and the alumina has a mean grain form factor Ra (Al2O3) which is the arithmetic mean of the shape factors RK of the grains, of at least 0.4. |