| US 7,575,805 B2 | ||
| Polycrystalline diamond abrasive elements | ||
| Roy Derrick Achilles, 608 San Martinho, Leicester Road, Bedfordview, Gauteng (South Africa); Bronwyn Annette Roberts, 94 18th Street, Parkhurst, Gauteng (South Africa); Imraan Parker, 65 Doreen Road, Rylands Estate, Cape Town (South Africa); Brett Lancaster, 59 Columbus Road, East Village, Sunward Park, Boksburg, Gauteng (South Africa); and Klaus Tank, 9 Warbleton Avenue, Essexwold, Johannesburg, Gauteng (South Africa) | ||
| Filed on Dec. 09, 2004, as Appl. No. 11/7,261. | ||
| Claims priority of application No. 2003/09629 (ZA), filed on Dec. 11, 2003. | ||
| Prior Publication US 2005/0139397 A1, Jun. 30, 2005 | ||
| Int. Cl. B32B 9/00 (2006.01) | ||
| U.S. Cl. 428—408 [51/307; 51/309; 428/325] | 18 Claims |
| 1. A polycrystalline diamond abrasive element, comprising:
a layer of polycrystalline diamond comprising a binder phase comprising catalyzing material, and
a substrate,
wherein said layer of the polycrystalline diamond comprises
a working surface and is bonded to the substrate along an interface,
a region adjacent said working surface which is lean in the catalyzing material, and
a region rich in the catalyzing material,
wherein said region rich in the catalyzing material comprises
said binder phase homogeneously distributed through the rich region, and
a fine scale of the binder phase distribution,
wherein the binder phase distribution is expressed in terms of an equivalent circle diameter, the standard deviation of the
distribution of equivalent circle diameters, expressed as a percentage of the average equivalent circle diameter, is less
than 80%, and
wherein the layer of the polycrystalline diamond comprises diamond particles having an average particle grain size of less
than 20 microns.
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