Abstract

The chemical state of submicron cubic boron nitride (cBN) powder surface has been studied. It has been shown that on the surface of cBN powders there are present water vapours, atomic and molecular oxygen, nitrogen, ammonia, oxides and dioxides of nitrogen and boron, magnium oxide and boron hydride. It has been established that on the surface of submicron powders of 0.25/0 granularity within the temperature range of 25–100°C two maxima of water vapour desorption are observed: at 25°C and at 75°C that indicates the presence of chemically adsorbed water. At temperatures above 150°C on the surface of cBN the desorption of chemically adsorbed water takes place. The quantity of atomic oxygen is higher than that of molecular oxygen. The maximum of atomic oxygen desorption is observed at 450°C and is due to dissociative chemisorption of hydroxyl groups.

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