Ceramic moldings composed of aluminum oxide having high metallization adhesion

摘要

Ceramic moldings composed of aluminum oxide which have a proportion of intercrystalline fracture of more than 50%, an average pore radius of more than 4 mu m and a porosity of more than 2%, are obtained by: a) grinding aluminum oxide which is at least 99.5% pure and has an average primary crystal size of 1 to 4 mu m to an average fragment size of 2 to 7 mu m, b) adding a source of magnesium oxide, silicon oxide and calcium oxide in amounts such that the magnesium oxide content is 0.2 to 2.5%, the silicon dioxide content is 1 to 6% and the calcium oxide content is 0.1 to 2.5%, in each case with respect to the amount of Al2O3, c) shaping a green compact and d) sintering.