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US 4,793,828 AGranted
Abrasive products
AssigneeTenon Limited
InventorRichard P. Burnand
Life of this patent
Estimating the term…
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AssigneeTenon Limited
InventorRichard P. Burnand
Estimating the term…
An abrasive tool having a working portion which includes an abrasive insert which is exposed to high temperatures during manufacture or use of the tool. Examples of such tools are dressing or turning tools and surface set or impregnated drill bits. The tools are characterized by the abrasive insert comprising a mass of diamond particles present in an amount of 80 to 90 percent by volume of the insert and a second phase present in an amount of 10 to 20 percent by volume of the insert, the mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent skeletal mass and a second phase consisting essentially of silicon, the silicon being in the form of silicon and/or silicon carbide. these abrasive inserts have been found to have substantial strength due, at least in part, to the diamond-to-diamond bonding and to be capable of withstanding temperatures of 1200.degree. C. under a vacuum 10.sup.-4 Torr or better or insert or reducing atmosphere without significant graphitization of the diamond occurring.
An abrasive tool having a working portion which includes an abrasive insert held therein, said abrasive insert consisting essentially of a mass of diamond particles present in an amount of 80 to 90 percent by volume of the insert and a second phase present in an amount of 10 to 20 percent by volume of the insert, the mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent skeletal mass and the second phase consisting essentially of silicon or silicon carbide or a combination thereof, said abrasive insert being capable of withstanding a temperature of 1200.degree. C. under a vacuum of 10.sup.-4 Torr or better or in an inert or reducing atmosphere without significant graphitization of the diamond occurring, and said insert having been exposed to a high temperature during manufacture of the tool, or being adapted for exposure to a high temperature during use of the tool.
An abrasive tool having a working portion which includes an abrasive insert held therein, said insert consisting essentially of a mass of diamond particles present in an amount of 80 to 90 percent by volume of the insert and a second phase present in an amount of 10 to 20 percent by volume of the insert, the mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent skeletal mass and the second phase consisting essentially of silicon or silicon carbide or a combination thereof, said abrasive insert being capable of withstanding a temperature of 1200.degree. C. under a vacuum of 10.sup.-4 Torr or better or in an inert or reducing atmosphere without significant graphitization of the diamond occurring, said abrasive insert having been exposed to a high temperature during manufacture of the tool or being adapted for exposure to a high temperature during use of the tool, and said abrasive insert having been formed by confining diamond and silicon within a reaction vessel comprising a high-melting, carbide-forming metal.
A method of cutting a material with an abrasive tool having a working portion including an abrasive insert held therein, which cutting operation results in the generation of temperature above 850.degree. C. in the region of interface of the tool and the material being cut, said method comprising the step of contacting said material and the abrasive insert of the abrasive tool, said abrasive insert consisting essentially of a mass of diamond particles present in an amount of 80 to 90 percent by volume of the insert and a second phase present in an amount of 10 to 20 percent by volume of the insert, the mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent skeletal mass and the second phase consisting essentially of silicon or silicon carbide or a combination thereof and said abrasive insert of said tool being capable of withstanding a temperature of 1200.degree. C. under a vacuum of 10.sup.-4 Torr or better or in an inert or reducing atmosphere without significant graphitization of the diamond occurring.
A process for the production of an abrasive tool having a working portion including an abrasive insert held therein, which comprises the steps of:
Dependencies are inferred from the claim text.