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US 6,645,265 B1Granted
Polishing formulations for SiO2-based substrates
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorYuhu Wang
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Abstract
Powders of particles comprising a ceramic core and a coating of ceria deposited thereon provide an economical and effective abrasive for glass polishing formulations.
Claims9
A process for the production of a glass polishing abrasive powder comprising ceramic core particles and a shell of ceria deposited thereon which comprises mixing a powder of the ceramic core particles with a solution of a ceria precursor to form a dispersion having solid content;
- adjusting the dispersion to have a pH of at least 8;
- aging the dispersion at a temperature of from 60 to 95° C. until the pH has stabilized above 8;
- separating and drying the solids content of the dispersion;
- and firing the dried solids at a temperature of from 600 to 1000° C., wherein the core particles are different material from the shell.
1 more element
Dependencies are inferred from the claim text.