Polycrystalline diamond construction & method of making

A superhard polycrystalline and polycrystalline superhard technology, which is applied in the manufacture of tools, earth drilling, metal processing equipment, etc., can solve the problems of difficult and expensive processing materials

Inactive Publication Date: 2015-07-08
ELEMENT SIX ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extreme hardness and wear resistance of materials such as PCD or PCBN typically used as cutting elements or inserts in such applications can make it very dif

Method used

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  • Polycrystalline diamond construction & method of making
  • Polycrystalline diamond construction & method of making

Examples

Experimental program
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Effect test

example 1

[0094] This non-limiting example shows a method of forming surface topology during sintering.

[0095] A surface topology can be tailored to the needs of a given drilling or cutting application and is related to the cutter configuration or the shape of the machine tool insert. A cobalt cemented carbide substrate body may be provided and a ceramic plug may be provided having a surface with a surface topology that complements (eg reverses) the desired surface topology of the cutter or machine tool insert. A pre-compressed assembly may be prepared by forming a mass of diamond particles into a polymer against the surface of a substrate, and encapsulating the assembly in an enclosure formed, for example, of alumina or other ceramic material. The surface of the ceramic plug with the desired surface topology imparted to the diamond body during sintering is placed in contact with the diamond particles. The pre-compressed assembly is subjected to an ultra-high pressure of at least abo...

example 2

[0097] Some submicron cobalt powder, sufficient to obtain 2% by weight in the final diamond mixture, was initially agglomerated down in the methanol suspension ball milled with tungsten carbide media for one hour. Fine-grained diamond powder with an average particle size of 2 micrometers was then added to the suspension, which amounted to 10% by weight in the final mixture. Additional milling media was introduced and methanol was further added to obtain a proper suspension; and further milled for one hour. Coarse-grained diamonds with an average particle size close to 20 microns were added next and made up 88% by weight of the final mixture. The suspension was again further supplemented with methanol and grinding media, and then further ground for 2 hours. The suspension was removed from the ball mill and dried to obtain a diamond powder mixture.

[0098] The diamond powder mixture is then placed into a suitable HPHT vessel adjacent to a substrate of tungsten carbide and sin...

example 3

[0101] Some submicron cobalt powder, sufficient to obtain 2.4% by weight in the final diamond mixture, was initially agglomerated down in the methanol suspension ball milled with tungsten carbide media for one hour. Fine-grained diamond powder with an average particle size of 2 micrometers was then added to the suspension to give a total of 29.3% in parts by weight in the final mixture. Additional grinding media was introduced and methanol was further added to obtain a proper suspension; and this was further ground for one hour. Coarse-grained diamonds with an average particle size close to 20 microns were added next to make up 68.3% by weight of the final mixture. The suspension was again further supplemented with methanol and grinding media, and then further ground for 2 hours. The suspension is removed from the ball mill and dried to obtain a diamond powder mixture

[0102] The diamond content of the sintered diamond structure is greater than 90% by volume and the distrib...

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PUM

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Abstract

A superhard polycrystalline construction is disclosed which comprises a body of polycrystalline superhard material such as diamond, comprising a mass of superhard grains exhibiting inter-granular bonding and defining a plurality of interstitial regions therebetween, the superhard grains having an associated mean free path and a non-superhard phase at least partially filling a plurality of the interstitial regions and having an associated mean free path. The median of the mean free path associated with the non-superhard phase divided by (Q3-Q1) for the non-superhard phase being 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 being less than 0.60. The body of polycrystalline superhard material has a first surface having a surface topology comprising one or more indentations therein and/or projections therefrom. There is also disclosed a method of forming such a construction wihch may be used for oil and gas drilling applications.

Description

technical field [0001] The present invention relates to a superhard structure and a method of making such a structure, in particular but not exclusively to structures comprising polycrystalline diamond (PCD) attached to a substrate, and tools comprising such polycrystalline diamond, Especially, but not exclusively, for cutting or drilling of rock, or for drilling holes in the ground in the oil and gas industry. Background technique [0002] Polycrystalline diamond (PCD) is an example of a superhard material (also known as a superabrasive) that contains a large number of diamond grains that are substantially inter-grown, forming a bone-like structure that defines the interstices between the diamond grains. of blocks. PCD materials typically comprise at least about 80% diamond by volume and are conventionally formed by subjecting aggregated masses of diamond particles to ultra-high pressures greater than about 5 GPa and temperatures of at least about 1200°C. A material that ...

Claims

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Application Information

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IPC IPC(8): C04B35/52C22C26/00E21B10/567
CPCC04B2235/427B22F2005/005B22F2005/001B22F3/14C22C2026/005B22F2999/00C04B35/52C22C26/00E21B10/567C22C2026/006B24D3/06B24D18/0009B22F2304/054E21B10/46E21B10/5671
Inventor 尼德雷特·卡恩
Owner ELEMENT SIX ABRASIVES
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