Functionally graded coatings for abrasive particles and use thereof in vitreous matrix composites
AssigneeGeneral Electric Company
InventorsAaron W. Saak, Mark P. D'Evelyn, Chung S. Kim, Michael H. Zimmerman, Steven W. Webb
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Abstract
Coated abrasive particle for use in vitreous bond matrices, which particle is coated with between 1 and about 50 coating layers. Each coating layer ranges in thickness from between about 0.1 and 50 microns. Each layer has the composition, MCXNYBZOW, where, M represents one or more of Ti, Si, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Re or a rare earth metal, and w, x, y, and z, each range from between 0 and 3. The outermost coating layer has a concentration of oxygen that is higher by a factor of at least about 2 than the layer in direct contact with the abrasive particle.
Claims15
Coated abrasive particle for use in vitreous bond matrices, which comprises:
- an abrasive particle coated with between 2 and about 50 coating layers, each coating layer ranging in thickness from between about 0.1 and 50 microns, each layer having the composition:
- MCXNYBZOW,
- where,
- M represents one or more of Ti, Si, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Re or a rare earth metal, and
- w, x, y, and z, each range from between 0 and 3;
- wherein the outermost coating layer has a concentration of oxygen and said concentration of oxygen is higher by a factor of at least about 2 than the layer in direct contact with the abrasive particle.
A composite vitreous element, which comprises:
- a vitreous matrix having abrasive particles dispersed therein, wherein said abrasive particles are coated with between 2 and about 50 coating layers, each coating layer ranging in thickness from between about 0.1 and 50 microns, each layer having the composition:
- MCXNYBZOW,
- where,
- M represents one or more of Ti, Si, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Re or a rare earth metal, and
- w, x, y, and z, each range from between 0 and 3;
- wherein the outermost coating layer has a concentration of oxygen and said concentration of oxygen is higher by a factor of at least about 2 than the layer in direct contact with the abrasive particle.
Dependencies are inferred from the claim text.