General Electric Company

Diamond Innovations. Inc.

Yue Meng

Thomas R Anthony

Mark Philip D'Evelyn

Dong-Sil Park

Clifford L Spiro

Christopher Long

Nishit Dey

An element-doped diamond crystal is disclosed herein. The crystal includes at least one dopant element which has a greater concentration toward or near an outermost surface of the crystal than in the center of the crystal. The concentration of the dopant element is at a local minimum at least about 5 micrometers below the surface. The concentration-profile of the dopant element for these diamond crystals causes an expansion of the diamond lattice, thereby generating tangential compressive stresses at the surface of the diamond crystal. These stresses beneficially increase the compressive fracture strength of the diamond.

Surface impurity-enriched diamond and method of making

A method for treating diamond for improving the oxidation resistance and the mechanical strength of said diamond crystals includes forming a mixture of diamond crystals, a source of boron, and inert particles. This mixture is heated at a temperature of between about 800&deg; and 1200&deg; C. for a time adequate to diffuse boron into the surface of the diamond crystals for improving the oxidation resistance and the mechanical strength of the boron-diffused diamond crystals. The resulting diamond crystals have improved oxidation resistance and improved mechanical strength by virtue of having had boron thermally diffused into the surface of thereof.

Thermally-diffused boron diamond and its production

Diamond particles are coated with a Ti metal to form Ti metal coated diamond particles product by contacting the diamond particles with an alloy of the following composition, Ti,Cr,, where 0.05<x<0.5, at a temperature of less than about 850&deg; C. and for a time sufficient for the alloy to coat the diamond particles. The resulting coated diamond particles have an average particle size ranging from about 5 to 800 &mgr;m and are coated with metal coating composed of an inner carbide layer enriched in Cr content and an outer layer depleted in Cr content.

Titanium chromium alloy coated diamond crystals for use in saw blade segments and method for their production

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Columbus, OH, United States of America

Yue Meng