초록 ▼

A cutter element for use in a drill bit, comprising a substrate and a plurality of layers thereon. The substrate comprises a grip portion and an extending portion. The layers are applied to the extending portion such that at least one of the layers is harder than at least one of the layers above it.

A cutter element for use in a drill bit, comprising a substrate and a plurality of layers thereon. The substrate comprises a grip portion and an extending portion. The layers are applied to the extending portion such that at least one of the layers is harder than at least one of the layers above it. The layers can include one or more layers of polycrystalline diamond and can include a layer in which the composition of the material changes with distance from the substrate.

대표청구항 ▼

[ What is claimed is:] [8.]8. An insert for use in a drill bit, comprising:a substrate supporting a cutting layer having a cutting surface, said cutting layer comprising:an ultrahard layer;a relatively soft layer comprising a material that is less wear resistant than said ultrahard material; anda fi

[ What is claimed is:] [8.]8. An insert for use in a drill bit, comprising:a substrate supporting a cutting layer having a cutting surface, said cutting layer comprising:an ultrahard layer;a relatively soft layer comprising a material that is less wear resistant than said ultrahard material; anda first additional layer;wherein at least one of said layers interrupts a gradient in a mechanical property of the layers, the mechanical property being selected from: the moduli of elasticity, wear resistances, hardnesses, strengths, and coefficients of thermal expansion of the layers; and wherein said first additional layer is between said ultrahard layer and said relatively soft layer, and said relatively soft layer is more wear resistant than said substrate.