Abstract: The present invention relates to a method for reducing structural damage to the surface of monocrystalline aluminium-nitride substrates, according to which the substrate undergoes thermal treatment in a crucible in an autoclave, during which treatment the aluminum-nitride substrate is sublimated in the damaged regions of the surface of the substrate and is removed. The method is used to prepare the surface of monocrystalline aluminium-nitride (AlN), in particular the aim of the invention is to eliminate, or at least significantly reduce near-surface structural damage to the monocrystalline material caused by mechanical processing. The invention also relates to aluminium-nitride substrates that are treated in this way.

Abstract: The present invention relates to aqueous suspensions containing 30 to 95 wt.-% metal carbide particles and a dispersant, and to a process for coating substrates using said aqueous suspensions. The invention also relates to the coated substrates that can be produced by the process according to the invention and to the uses thereof.

Abstract: A method for cutting a single crystal having a first polar axis includes the steps of arranging the single crystal relative to a cutting tool in such a way that the first polar axis is oriented perpendicular to an intended cutting plane; arranging at least one further single crystal having a second polar axis in such a way that the first and the second polar axis are oriented substantially parallel but opposite one another; and simultaneously guiding a cutting tool through the single crystal and the at least one further single crystal along the intended cutting plane.