Coated abrasives

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 3/14 (2006.01)

Patent

CA 2553566

A coated super-hard abrasive comprises a core of super-hard abrasive material, which is typically diamond or cBN based, an inner layer of a metal carbide, nitride, boride or carbonitride chemically bonded to an outer surface of the super-hard abrasive material and an outer layer of a metal carbonitride, in particular titanium carbonitride. The outer layer is preferably applied by physical vapour deposition. The inner layer is formed from an element capable of forming (singly or in combination) carbides, nitrides or borides to the surface(s) of the abrasive material when applied using a hot coating process.

L'invention porte sur un abrasif extra-dur comprenant: un corps de matériau abrasif extra-dur, normalement à base de diamant ou de cBN (nitrure de bore cubique); une couche intérieure de carbure, nitrure, borure, ou carbonitrure métallique chimiquement lié à la surface extérieure du matériau abrasif extra-dur; et une couche extérieure de carbonitrure métallique, en particulier de carbonitrure de titane. La couche extérieure est de préférence appliquée par dépôt physique en phase vapeur. La couche intérieure est constituée d'un élément capable de former (seul ou en association) des carbures, nitrures, ou borures sur la ou les surfaces du matériau abrasif lors qu'appliquée par un procédé de revêtement à chaud.

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