Fixed abrasive polishing media

Details Fixed abrasive polishing media Fixed abrasive polishing media

1983-04-22

1984-08-21

Whitehead, Harold D.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51295, 51296, B24D 1100

Patent

active

044662181

ABSTRACT:
The disclosure is directed to a method and apparatus for superfinishing magnetic disk substrates using a non-friable polishing pad including a high density polyurethane foam binder in which at least 50 per cent by weight of classified hard particles are retained. Polishing occurs by rotating the pad against the surface to be ultrafinished in the presence of a water soluable liquid vehicle maintaining a minimum pressure of 5 pounds per square inch at a rotational speed that achieves the desired aggressiveness of the polishing media. The method and apparatus contemplate both the ultrafinishing of newly prepared substrate disks and the restoring of previously coated disks to a ultrafinished substrate condition without producing substances or conditions toxic to the ecology or the operator.

REFERENCES:
patent: 3500589 (1970-03-01), Ellege
patent: 3721046 (1973-03-01), Dunn
patent: 4078340 (1978-03-01), Klecker
patent: 4111666 (1978-09-01), Kablow
patent: 4179852 (1979-12-01), Barnett
patent: 4307544 (1981-12-01), Balz

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