A tool of a surface-coated boron nitride sintered compact

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 16/30 (2006.01) B24D 3/00 (2006.01) B26D 7/00 (2006.01) C04B 41/52 (2006.01) C04B 41/89 (2006.01) C23C 14/02 (2006.01) C23C 14/22 (2006.01)

Patent

CA 2356042

The object of the present invention is to provide a cutting tool con-sisting of a suface-coated high pressure phase type boron nitride sintered compact, having a markedly improved adhesive strength of a hard coated layer to a cBN sintered compact substrate. The feature consists in a surface-coated boron nitride sintered compact tool, in which at least a part of the tool edge related with cutting is based on a substrate of a high pressure phase type boron nitride, and a surface- coated layer is allowed to be present on the surface thereof, the said surface-coated layer comprising an intermediate layer being present in discontinuous manner to the interface of the said high pressure phase boron nitride sintered compact substrate and a hard coated layer formed further thereon or in the form of dispersed particles, the said intermediate layer consisting of at least one element selected from the Group 4a, 5a and 6a of Periodic Table.

L'objet de la présente invention est de fournir un outil de coupe composé d'une pastille frittée de nitrure de bore de type à phase haute pression dont la surface a une couche de protection, ayant une adhérence notablement améliorée d'une couche de revêtement dur à un substrat de pastille frittée cBN. Il s'agit d'un outil de pastille frittéede nitrure de bore dont la surface a une couche de protection, dans laquelle au moins une partie du bord de l'outil liée à la coupe est basée sur un substrat de nitrure de bore de type à phase haute pression, et une couche à surface enduite peut être présente sur la surface de celui-ci, ladite couche à surface enduite comprenant une couche intermédiaire étant présente de manière discontinue à l'interface de pastille frittéede nitrure de bore à phase haute pression et une couche de revêtement dur formé à partir de celle-ci ou sous la forme de particules dispersées, ladite couche intermédiaire étant constituée d'au moins un élément choisi parmi le groupe 4a, 5a et 6a du tableau périodique.

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