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A superhard structure and method of making same

A super-hard structure, polycrystalline super-hard technology, applied in the field of wear-resistant components, can solve the problems of reducing the service life of the drill bit, tool failure, PCD breakage, etc.

Inactive Publication Date: 2014-01-29
ELEMENT SIX ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A crack propagating towards and through the free surface of the tool will cause the tool to split and bulky PCD will break away from the PCD cut face
The result of this phenomenon can reduce the service life of the drill bit and lead to serious failure of the tool

Method used

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  • A superhard structure and method of making same
  • A superhard structure and method of making same
  • A superhard structure and method of making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116] manufacturing based on Figure 2a , Figure 2b Example of a PCD cutter. Figure 15 is a graphic of the specific design used by these knives. The final PCD section thickness was 2.2 mm, bonded to a tungsten carbide, 13% by weight cobalt hard metal substrate, and a length of 13.8 mm. The straight cylindrical tool has a diameter of 16 mm, an overall length of 16 mm, and a flat interface between the PCD facet and the carbide substrate.

[0117] refer to Figure 15 , different PCD material volumes 1 to 6 were fabricated using tape casting manufacturing techniques known in the art. Green state disks or washers of six different diamond powders were fabricated using a water-soluble binder. In each case, the disc and gasket are assembled to form a Figure 15 The geometry is housed in a refractory metal cup, which is subsequently fixed on a cylinder of pre-sintered tungsten carbide / cobalt hard metal. These assemblies are then vacuum degassed in the furnace at a temperature...

example 2

[0146] manufacturing based on Figure 7 Example of a PCD cutter. Figure 17 is a graphic of the specific design used by these knives. As in Example 1, the final PCD facet thickness was 2.2 mm, bonded to tungsten carbide, a cobalt hard metal substrate with a weight ratio of 13%, and a length of 13.8 mm. The straight cylindrical tool has a diameter of 16mm, an overall length of 16mm, and has a flat interface between the PCD facet and the carbide substrate.

[0147] In this example, PCD facets are fabricated from volumes of only two different PCD materials. The PCD material with the largest coefficient of thermal expansion forms a disk at Figure 17 Marked as 1, through Figure 17 The volume of PCD material with a lower coefficient of thermal expansion, marked 12, is partially separated from the base interface, top surface and circumferential free surface of the PCD cut plane. The discontinuity in zone 12, through which the material forming disc 1 extends to the peripheral f...

example 3

[0164] according to Figure 18a Manufactures PCD cutting tools, which are based on Figure 5 A specific design of an embodiment where the PCD facets are fabricated from three volumes of different PCD materials. The PCD material with the highest coefficient of thermal expansion and the highest metal content forms a disc at Figure 16a Marked as 13, its center is located at the base interface and arranged symmetrically around the central axis of the tool. Material volume made from PCD material with minimum thermal expansion coefficient and metal content, at Figure 18a 15 , which extends across the top free surface of the PCD facet and most of the peripheral free surface, except for a portion forming a discontinuity through which the PCD material of maximum coefficient of thermal expansion extends (not shown). and Figure 18a The PCD material (labeled 14 ) made of a material with an intermediate coefficient of thermal expansion and metal content occupies the volume separatin...

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Abstract

A superhard structure comprises a body of polycrystalline superhard material comprising a first region and a second region. The second region is adjacent an exposed surface of the superhard structure and comprises a diamond material or cubic boron nitride with a density greater than 3.4×103 kilograms per cubic metre when the second region comprises diamond material. The material(s) forming the first and second regions have a difference in coefficient of thermal expansion, the first and second regions being arranged such that this difference induces compression in the second region adjacent the exposed surface. The first / a further region has the highest coefficient of thermal expansion of the polycrystalline body and is separated in part from a peripheral free surface of the body by the second region or one or more further regions formed of a material(s) of a lower coefficient of thermal expansion. The regions comprise a plurality of grains of polycrystalline superhard material. The second region is peripherally discontinuous with a gap therein through which a portion of the region formed of the material of highest coefficient of thermal expansion extends to the free surface of the superhard structure. There is also disclosed a method for making such a structure.

Description

technical field [0001] The present invention relates to a superhard structure comprising a body of polycrystalline material, a method of manufacturing a superhard structure, and a wear-resistant element comprising a polycrystalline superhard structure. Background technique [0002] Polycrystalline diamond (PCD) material is produced by subjecting a quantity of diamond particles of a selected average particle size and size distribution to high pressure and high temperature while in contact with a pre-existing hard metal substrate. Pressures typically used in this process are in the range of about 4 to 7 GPa, although higher pressures up to 10 GPa or more may be used in practice. The temperature employed is above the melting point of the transition metal binder of the hard metal substrate at this pressure. In the typical case where a tungsten carbide / cobalt substrate is used, temperatures above 1395° C. are sufficient to melt the metal, such as cobalt, in the binder which infi...

Claims

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Application Information

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IPC IPC(8): C22C26/00B22F7/06
CPCB24D3/06B22F7/062C22C26/00B01J3/062C01B32/25C01B32/28C04B35/52C04B35/5831C30B29/04C30B29/38
Inventor 穆萨·马霍姆·阿迪亚杰弗里·约翰·戴维斯大卫·克里斯蒂安·鲍思
Owner ELEMENT SIX ABRASIVES
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