SCRATCH-RESISTANT COATINGS, SUBSTRATES HAVING SCRATCH-RESISTANT COATINGS AND METHODS FOR PRODUCING SAME

摘要

The present invention relates to a substrate having a coating for improving scratch resistance, said coating comprising at least one layer of a high refractive index transparent hard material. The hard material layer comprises crystalline aluminum nitride having a hexagonal crystal structure exhibiting a predominant (001) preferred orientation of hexagonal symmetry. The present invention also relates to a process for the preparation of such coated substrates and to their use.