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Superhard constructions and methods of making same

A technology of structure and superhard phase, which is applied in the direction of manufacturing tools, earthwork drilling, abrasives, etc., and can solve the problems of reduced impact resistance of composite materials

Inactive Publication Date: 2015-04-08
ELEMENT SIX ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Methods used to improve wear resistance of PCD composites often result in reduced impact resistance of the composite

Method used

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  • Superhard constructions and methods of making same
  • Superhard constructions and methods of making same
  • Superhard constructions and methods of making same

Examples

Experimental program
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Effect test

Embodiment 1

[0141] Submicron cobalt powder in an amount sufficient to obtain 2% by mass in the final diamond mixture used to form one type of layer was first deagglomerated in a methanol slurry in a ball mill with WC grinding media for 1 hour. A fine fraction of diamond powder having an average particle size of 2 μm is then added to the slurry in an amount to obtain 10% by mass in the final mixture. Additional milling media was introduced and additional methanol was added to obtain a suitable slurry; the resultant was milled for an additional hour. A coarse fraction of diamond with an average particle size of about 20 μm is then added in an amount to obtain 88% by mass in the final mixture for forming one type of layer. The slurry was replenished with additional methanol and grinding media, and then ground for an additional 2 hours. The slurry is removed from the ball mill and dried to obtain a diamond powder mixture.

[0142] The diamond powder mixture is then placed into a suitable HP...

Embodiment 2

[0144] Submicron cobalt powder in an amount sufficient to obtain 2.4% by mass in the final diamond mixture for forming one type of layer was first deagglomerated in a methanol slurry in a ball mill with WC grinding media for 1 hour. A fine fraction of diamond powder with an average particle size of 2 μm was then added to the slurry in an amount to obtain 29.3% by mass in the final mixture for forming one type of layer. Additional milling media was introduced and additional methanol was added to obtain a suitable slurry; the resultant was milled for an additional hour. A coarse fraction of diamond with an average particle size of about 20 μm is then added in an amount to obtain 68.3% by mass in the final mixture for forming one type of layer. The slurry was replenished with additional methanol and grinding media, and then ground for an additional 2 hours. The slurry is removed from the ball mill and dried to obtain a diamond powder mixture for forming one type of layer.

[01...

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Abstract

A superhard polycrystalline construction, such as polycrystalline diamond, is disclosed which comprises a body of polycrystalline superhard material having a first region 41,42 and a second region 46 adjacent to and bonded to the first region by intergrowth of grains of superhard material. The first region comprises a plurality of alternating layers, each having a thickness in the range of around 5 to 300 microns. One or more layers in the second region have a thickness greater than the thicknesses of the individual layers in the first region. The alternating layers in the first region comprise first layers alternating with second layers, the first layers being in a state of residual compressive stress and the second layers being in a state of residual tensile stress. One or more of the layers in the first or second regions comprise a mass of superhard grains exhibiting inter-granular bonding and defining a plurality of interstitial regions therebetween, the superhard grains and a non-superhard phase at least partially filling a plurality of the interstitial regions. The median of the mean free path associated with the non-superhard phase divided by (Q3-Q1) for the non-superhard phase is greater than or equal to 0.50, where Q1 is the first quartile and Q3 is the third quartile; and the median of the mean free path associated with the superhard grains divided by (Q3-Q1) for the superhard grains is less than 0.60. A method of forming the construction is also disclosed.

Description

technical field [0001] The present invention relates to superhard constructions and methods of making such constructions, particularly but not limited to constructions comprising polycrystalline diamond (PCD) structures attached to a substrate, and to tools comprising said constructions, in particular but not limited to for use in Rock breaking (degradation) or rock drilling (drilling), or for crustal drilling. Background technique [0002] Polycrystalline superhard materials such as polycrystalline diamond (PCD) and polycrystalline cubic boron nitride (PCBN) can be used in a variety of tools for cutting, machining, drilling or breaking hard or abrasive materials such as rock , metals, ceramics, composites and wood-containing materials. In particular, tool inserts in the form of cutting elements comprising PCD material are widely used in drill bits for surface drilling for oil or gas. The working life of a superhard tool insert may be limited by fracture of the superhard m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C22C26/00E21B10/567
CPCE21B10/573C22C26/00C04B35/52B22F2005/001C04B35/645C04B2235/32C04B2235/3804C04B2235/3817C04B2235/3852C04B2235/427B24D3/06C23F1/28C23F1/02E21B10/567C04B35/5831E21B10/46
Inventor 尼德雷特·卡恩汉弗莱·萨姆克罗·路基萨尼·希特赫比
Owner ELEMENT SIX ABRASIVES
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