Patent ID: 7998866

Claim:
A method of chemically-mechanically polishing a substrate, which method comprises: (i) contacting a substrate comprising at least one layer of single crystal silicon carbide with a chemical-mechanical polishing composition comprising: (a) a liquid carrier, (b) an abrasive suspended in the liquid carrier, wherein the abrasive is alumina and is present in an amount of about 3 wt. % or less based on the weight of the liquid carrier and any components dissolved or suspended therein, and (c) an oxidizing agent, wherein the oxidizing agent is present in an amount of about 0.001 wt. % to about 2.5 wt. % based on the weight of the liquid carrier and any components dissolved or suspended therein, and wherein the oxidizing agent is selected from the group consisting of hydrogen peroxide, oxone, ammonium cerium nitrate, periodates, periodic acid, iodates, persulfates, chromates, chlorates, permanganates, bromates, perbromates, ferrates, perrhenates, perruthenates, and mixtures thereof, and (ii) moving the polishing composition relative to the substrate, and (iii) abrading at least a portion of the silicon carbide of the substrate to polish the substrate.