Polycrystalline diamond element

A polycrystalline diamond and diamond technology, applied in metal processing equipment, construction, abrasives, etc., can solve problems such as poor thermal stability, and achieve the effect of improving thermal stability without compromising strength

Inactive Publication Date: 2012-03-28
ELEMENT SIX PRODION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of PCD containing specific diamond catalyst materials as filler materials may be its relatively poor thermal stability above about 400 °C

Method used

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  • Polycrystalline diamond element
  • Polycrystalline diamond element
  • Polycrystalline diamond element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A PCD insert with a diameter of approximately 16 mm and used for rotary drag bits for oil and gas drilling was used as a starting element. The insert is substantially cylindrical and comprises a PCD layer integrally bonded to the WC hard metal substrate of the Co junction. The PCD layer is about 2.3 millimeters thick, and the diamond grain size distribution is of the multimodal type, comprising sintered diamond grains with an average grain size of less than about 20 microns, the interstices between the diamond grains being filled with Co (during the step of sintering the PCD Catalyst metal) filling from the hard metal substrate during the process. Substantially all of the hard metal substrate is machined away from the PCD layer to provide a PCD flake. Porous, isolated PCD pellets were subsequently removed by immersing them in a mixture of hydrofluoric and nitric acids for several days to remove substantially all of the Co from the PCD pellets. The PCD pellets are heat...

Embodiment 2

[0064] The repermeation insert was fabricated using the same method as in Example 1, the only difference being that silver foil was used instead of copper foil. The insert was also analyzed and tested as in Example 1.

[0065] Silver penetrated deeper into the PCD than copper, to a depth of about 2.2 mm from the flat work surface. This is thought to be due to the lower melting point of silver and the fact that it melts at an earlier stage than copper and therefore has more time to infiltrate the porous PCD before the cobalt melts and infiltrates from the opposite direction.

Embodiment 3

[0067] Porous PCD pellets can be prepared using the method described in Example 2, and silver can be introduced into the pores prior to treatment at ultrahigh pressure. This can be achieved by placing the porous PCD pellet into a graphite container and disposing on it a silver film that has been ultrasonically cleaned in an acetone bath. The container can then be placed in a furnace and its contents heated in vacuum to above the melting point of silver, ie about 1,000°C, causing the silver foil to melt and infiltrate the PCD sheet.

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Abstract

An embodiment of a PCD insert comprises an embodiment of a PCD element joined to a cemented carbide substrate at an interface. The PCD element has internal diamond surfaces defining interstices between them. The PCD element further comprises a working surface and a low melting point region adjacent the working surface in which the interstices are at least partially filled with a low melting point metallic material having a melting point of less than about 1,300 degrees centigrade at atmospheric pressure, or less than about 1,200 degrees centigrade at atmospheric pressure. The PCD element includes an intermediate region, the interstices of the intermediate region being at least partially filled with a catalyst material for diamond.

Description

technical field [0001] The present invention relates to polycrystalline diamond (PCD) elements, in particular but not exclusively to PCD elements suitable for use in attack tools and knives such as jacks and rotary drill bits, such as may be used in mining, tunneling, construction and The oil and gas industry processes or breaks paving materials, rock formations, etc., or drills into the ground. Background of the invention [0002] Cutter inserts for drill bits that drill into the earth may contain a layer of polycrystalline diamond (PCD) bonded to a cemented carbide substrate. Such tool inserts may be referred to as polycrystalline diamond compacts (PDC). [0003] PCD is an example of a superhard (also called superabrasive) material comprising a large number of substantially intergrown diamond grains forming a skeletal mass that defines the interstices between the diamond grains. The PCD material comprises at least about 80 volume percent diamond and can be prepared by su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C26/00E21B10/567
CPCB22F2005/001E21B10/5735B22F7/06B22F2999/00C22C26/00B24D3/10B24D18/0009B22F2207/03E21B10/5676E21B10/5671
Inventor J·H·利韦尔萨格K·奈杜
Owner ELEMENT SIX PRODION
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