Abrasive article with array of composite polishing pads
An abrasive article for polishing a substrate surface. The abrasive article includes a holder pad assembly and an abrasive member held in place with respect to a holder pad. The abrasive member further includes a first surface engaged with the holder pad assembly, and a second surface including an abrasive. A preload mechanism is positioned to bias the second surfaces of the abrasive member toward the substrate surface. One or more fluid bearing features on the second surface of the abrasive member is configured to generate lift forces during relative motion between the abrasive article and the substrate surface.
1. An abrasive article for polishing a substrate surface, the abrasive article comprising:
a flexible holder pad assembly;
an array of abrasive members held in place with respect to the flexible holder pad, the abrasive members further comprising:
a first surface engaged with the holder pad assembly, and a second surface including an abrasive;
a preload mechanism positioned to bias the second surfaces of the abrasive members toward the substrate surface; and
one or more fluid bearing features on the second surface of the abrasive members comprising hydrodynamic bearing structures configured to generate lift forces during relative motion between the abrasive article and the substrate surface.
2. The abrasive article of claim 1 further comprising at least one abrasive features located on the second surface of the abrasive members, the at least one abrasive feature applying a cutting force to the substrate surface during relative motion between the abrasive article and the substrate surface.
3. The abrasive article of claim 2 wherein the at least one abrasive feature includes diamond like carbon.
4. The abrasive article of claim 2 wherein the at least one abrasive feature includes aluminum oxide.
5. The abrasive article of claim 2 wherein the at least one abrasive feature includes a shaped abrasive feature.
6. The abrasive article of claim 1 comprising hydrostatic bearing structures.
7. The abrasive article of claim 1 wherein the array of abrasive members comprises a cylindrical array.
8. A flexible abrasive article for polishing a substrate surface, the abrasive article comprising:
a preload assembly;
a flexible backing comprising foil held over the preload assembly, the flexible backing further comprising:
a first surface comprising one or more fluid bearings fabricated on the flexible backing to generate lift forces during motion of the abrasive article relative to the substrate surface;
a second surface engaging the preload assembly; and
a mechanism that biases the second surface of the abrasive article toward the substrate surface.
9. The flexible abrasive article of claim 8 further comprising at least one abrasive feature located on the first surface of the flexible backing, the at least one abrasive feature applying cutting forces to the substrate surface during relative motion of the abrasive article and the substrate surface.
10. The flexible abrasive article of claim 8 wherein the preload assembly comprises a hydrostatic bearing structure.
11. The flexible abrasive article of claim 10 comprising sensors located on a hydrostatic bearing structure.
12. The flexible bearing abrasive article of claim 8 wherein the preload assembly is a gimbal assembly comprising negative suction force.
13. The flexible abrasive article of claim 8 wherein the fluid bearing comprises a hydrostatic bearing structure.
14. The flexible abrasive article of claim 8 wherein the fluid bearing comprises a hydrodynamic bearing structure.
15. A flexible abrasive article for polishing a substrate surface, the abrasive article comprising:
a flexible backing comprising foil under tension;
a preload comprising a plurality of closed form hydrostatic bearing structures separated by grooves connected to ambient pressure;
a first non-abrasive foil surface associated with the flexible backing;
a second abrasive foil surface associated with the flexible backing;
the first non-abrasive foil surface engaging the hydrostatic bearing structures to impart bearing surfaces on the abrasive second flexible foil bearing surface;
a mechanism that biases the second abrasive surface toward the substrate surface; and
an abrasive feature located on the second surface of the flexible backing, the abrasive feature applying cutting forces to the substrate surface during motion of the abrasive article relative to the substrate surface.
16. The flexible abrasive article of claim 15 comprising sensors located at a closed form hydrostatic bearing structure.
17. The flexible abrasive article of claim 15 wherein the second abrasive surface includes a hydrostatic bearing structure.
18. The flexible abrasive article of claim 15 wherein the second abrasive surface comprises a hydrodynamic bearing structure.
19. The flexible abrasive article of claim 15 wherein the second abrasive surface includes diamond like carbon.
20. The flexible abrasive article of claim 15 wherein the second abrasive surface includes alumina.
21. A flexible abrasive article for polishing a substrate surface, the abrasive article comprising:
a flexible backing comprising foil with hydrodynamic bearing structures suspended by one or more ribs;
a mechanism that biases second surfaces of the abrasive article toward the substrate surface; and
abrasive features located on a surface of the flexible backing nearest the substrate surface, the abrasive features applying cutting forces to the substrate during motion of the abrasive article relative to the substrate.
22. The flexible abrasive article of claim 21 , wherein the flexible backing comprises hydrodynamic bearing structures suspended by a gimballing mechanism.
23. The flexible abrasive article of claim 21 , wherein the backing comprises with hydrodynamic bearing structures suspended with a hydrostatic bearing structure.
24. The flexible abrasive article of claim 21 wherein the abrasive article is cylindrical.