Coated diamond

A diamond and single crystal diamond technology, applied in the field of coated diamond abrasive grains, diamond grains, tools, and tools containing abrasives, can solve problems such as pollution and damage to the structural integrity of the coating, and achieve the effect of cost reduction

Inactive Publication Date: 2010-03-24
ELEMENT SIX LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This contaminates and compromises the structural integrity of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Three coating products were prepared on Element 640 / 45US Mesh abrasive grains: (1) 0.5 μm Ti coating applied by PVD, (2) 0.5 μm TiC coating applied by CVD, and (3) coating by CVD A coating (0.4 μm thick) consisting of the TiC primary layer obtained and a W secondary layer obtained by PVD.

[0111] Coated diamond abrasive grains were mixed with solder paste and placed on tungsten carbide coupons. The coated diamond, braze, and coupon were then heated using an induction coil until the solder paste was visibly melted and all flux had been burned off. The brazed samples were tested after cooling. In all cases it was seen that the solder paste did not wet the coating surface. Therefore, (1), (2) or (3) cannot be brazed in air because the coating surface oxidizes and thus inhibits the wetting of the brazing material. The reasons described above are expected to result in poor retention of diamond in the solder.

Embodiment 2

[0113] Using (1), (2) and (3) from Example 1, a silver overcoat (0.1 μm thick) was applied to each coated product obtained by PVD to prepare samples (4), (5) respectively and (6). Brazing was performed as outlined in Example 1. In the cases of (4) and (5), the solder paste did not wet the surface of the diamond. However, in the case of (3), the coated diamond is wetted by the brazing filler metal. Thus, samples (4) and (5) would be expected to result in poor diamond retention in the solder, while sample (6) would be expected to have relatively good diamond retention in the solder.

Embodiment 3

[0115] Two coating products were prepared on element 6325 / 400 US Mesh abrasive grains: (7) a coating consisting of a TiC primary layer obtained by CVD and a W secondary layer (0.4 μm thick) obtained by PVD, and ( 8) Coating consisting of a TiC primary layer obtained by CVD, a W secondary layer obtained by PVD (0.4 μm thick) and an Ag overcoat layer obtained by PVD (0.1 μm thick). Brazing was performed as outlined in Example 1. In the case of (7), the solder paste did not wet the diamond surface. However, in the case of (8), the coated diamond gets wetted by the solder paste. Therefore, sample (8) would be expected to have relatively good diamond retention in the solder.

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Abstract

The invention relates to a coated diamond comprising a diamond substrate; a primary carbided layer of a carbide forming element; a secondary layer of a high melting point metal selected from W, Mo, Cr, Ni, Ta, Au, Pt, Pd or any combination or alloy thereof, the secondary layer being substantially free of carbide forming element from the primary layer; and an overcoat of Ag, Ni, Cu, Au, Pd, Pt, Rh,Os, Ir, Re, any combination or alloy thereof, the metal of the secondary layer being different to the metal of the overcoat. The invention further relates to methods for producing such coated diamonds and abrasive-containing tools including such coated diamonds.

Description

[0001] preamble [0002] The present invention relates to coated diamond particles, methods of making such coated diamond particles, and their use in tools. In particular, the invention relates to diamond particles coated with a primary coating, a secondary coating and an overcoat. Background of the invention [0003] The present invention relates to coated diamond material, methods of making such material, and abrasive-containing tools comprising the coated diamond material. In particular, the invention relates to coated diamond abrasive grains, and the use of such abrasive grains in air brazing. [0004] Abrasive particles such as diamond are commonly used for cutting, grinding, drilling, sawing and polishing applications. One method of preparing tools for the above uses is brazing. During brazing, however, it is difficult to obtain a sufficient bond between the diamond and the brazing material because of the poor wettability of standard brazes to the diamond surface. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/00
CPCC09K3/1445Y10T428/2991Y10T428/12549C23C14/18C23C14/06C23C14/14C23C16/06
Inventor D·P·伊根K·格里尼
Owner ELEMENT SIX LTD
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