Patent ID: 9330703
Filing Date: 2016-05-03
CPC Classification: C09G,C09K,C23F,G11B

Claim Text:
1. A method of chemically-mechanically polishing a nickel-phosphorous-coated aluminum substrate comprising: (i) contacting a substrate with a polishing pad and a chemical-mechanical polishing composition comprising: (a) fumed alumina particles, (b) alpha alumina particles, (c) substantially spherical, non-aggregated silica particles, (d) about 10 ppm to about 200 ppm nonionic surfactant (d) an oxidizing agent comprising 0.05 wt. % to about 0.3 wt. % of hydrogen peroxide, about 0.1 wt. % to about 0.5 wt. % potassium hydrogen peroxymonosulfate sulfate, and about 0.5 wt. % to about 1 wt. % sodium persulfate, (e) a complexing agent, and (f) water, (ii) moving the polishing pad relative to the substrate with the chemical-mechanical polishing composition there between, and (iii) abrading at least a portion of the substrate to polish the substrate, wherein the microwaviness and edge roll-off in the polished substrate is improved compared to substrates polished with identical polishing compositions, but having only one or two of the oxidizing agents.