Abrasive tools
AssigneeNorton Company
InventorsSrinivasan Ramanath, William H. Williston, Sergej-Tomislav Buljan
Life of this patent
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Abstract
Abrasive tools suitable for precision grinding of hard brittle materials, such as ceramics and composites comprising ceramics, at peripheral wheel speeds up to 160 meters/second are provided. The abrasive tools comprise a wheel core attached to an abrasive rim of dense, metal bonded superabrasive segments by means of a thermally stable bond. A preferred tool for backgrinding ceramic wafers contains graphite filler and a relatively low concentration of abrasive grain.
Claims11
A surface grinding abrasive tool comprising a core, having a minimum specific strength parameter of 2.4 MPa-cm.sup.3 /g, a core density of 0.5 to 8.0 g/cm3, a circular perimeter, an abrasive rim defined by a plurality of abrasive segments;
- and a thermally stable bond between the core and the rim;
- wherein the abrasive segments comprise, in amounts selected to total a maximum of 100 volume %, from 0.05 to less than 10 volume % superabrasive grain, from 10 to 35 volume % friable filler, and from 55 to 89.95 volume % metal bond matrix having a fracture toughness of 1.0 to 3.0 MPa M.sup.1/2.
Dependencies are inferred from the claim text.