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Polycrystalline diamond composites

一种多晶金刚石、化合物的技术，应用在多晶材料生长、晶体生长、单晶生长等方向，能够解决不足金属间化合物等问题

Inactive Publication Date: 2010-06-16
ELEMENT SIX PRODION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, while the low levels of residual non-catalyst present are expected to remain within the PCD bulk, these levels are not expected to be in amounts sufficient to result in significant intermetallic compound formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1: Using the unbacked PCD sample produced by the Co-Sn system.

[0075] Various PCD samples sintered in the presence of Co-Sn-based binders were prepared. Produce a mixture of several Co and Sn metal powders with a certain range of Co:Sn ratio. For each sample, a bed of multimodal diamond powder with an average diamond grain size of about 20 μm was then placed in a niobium metal can, and a metal powder mixture layer sufficient to provide a binder accounting for 10% by volume of diamond was placed on the powder Bed. The tank was then evacuated to remove air, sealed, and processed under standard HpHT conditions of about 55 kbar and 1400°C to sinter the PCD.

[0076] Then take the sintered PCD composite sheet out of the can and use the following for inspection:

[0077] · Scanning Electron Microscopy (SEM) is used to demonstrate cross-growth; and

[0078] • XRD analysis to determine the phases present in the adhesive.

[0079] The characterization results are summarized ...

Embodiment 2

[0088] Example 2: Using Co-Sn system to produce PCD samples with carbide substrate backing

[0089] Several Co-Sn-based PCD samples sintered onto cemented carbide substrates were prepared. In various cases, tin powder and cobalt metal powder are pre-reacted to produce a CoSn alloy / intermetallic compound with a specific atomic ratio of 1:1. This pre-reaction source is then introduced into the unsintered diamond powder material by pre-synthesis mixing or in-situ infiltration.

[0090] A 1:1 CoSn pre-reacted powder mixture was prepared by grinding the Co and Sn powders together in a planetary ball mill. The powder mixture is then heat treated in a vacuum furnace (600°C-800°C) to produce a reacted CoSn material. This pre-reacted material is then further crushed / milled to break up agglomerates and reduce particle size.

[0091] The characteristics of the diamond powder used are multimodal and have an average grain size of about 22 μm. Then a selected amount of this CoSn material (expr...

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Abstract

The invention is for a polycrystalfine diamond composite material comprising intergrown diamond particles and a binder phase, the binder phase comprising a tin-based intermetallic or ternary carbide compound formed with a metallic solvent / catalyst. The invention extends to a polycrystalline diamond abrasive compact comprising such a composite material and to a tool insert comprising such a diamond abrasive compact.

Description

Background of the invention [0001] The present invention relates to a polycrystalline diamond (PCD) composite material with improved thermal stability. [0002] Polycrystalline diamond (PCD) is widely used as a tool for cutting, milling, grinding, drilling and other grinding operations due to its high abrasion resistance and strength. In particular, it can be used for cutting elements included in drill bits for underground drilling. [0003] A commonly used tool containing a PCD composite abrasive compact is a tool containing a PCD layer bonded to a substrate. The content of diamond particles in these layers is typically high and there is usually a large amount of direct diamond-to-diamond bonding or contact. Diamond compacts are usually sintered under elevated temperature and pressure conditions under which the diamond particles are crystallographically or thermodynamically stable. [0004] Examples of composite abrasive composite sheets can be found in the description of US Paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/28C22C26/00C30B29/04
CPCC22C26/00B22F2005/001
Inventor C·S·蒙特罗斯H·西斯比
Owner ELEMENT SIX PRODION
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