Abrasive compound for glass hard disk platter

Details Abrasive compound for glass hard disk platter Abrasive compound for glass hard disk platter

2003-10-06

2009-08-25

Marcheschi, Michael A (Department: 1793)

Abrasive tool making process, material, or composition

With inorganic material

C051S308000, C216S097000, C106S003000, C510S180000, C510S181000

Reexamination Certificate

active

07578862

ABSTRACT:
The present invention provides an abrasive compound suitable for polishing the surface of a glass substrate for an optical disk platter or a magnetic disk platter. More specifically, the present invention provides an abrasive compound for a glass hard disk platter, characterized as comprising a stable slurry having water and, dispersed therein as an abrasive, cerium(IV) oxide particles having an average secondary particle size of 0.1 to 0.5 μm and containing CeO2in a concentration of 0.2 to 30 wt %. Preferably, the present invention provides the above abrasive compound in which cerium amounts for 95% or more in terms of oxides of the total amount of rare earth elements in the abrasive.

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