Magnetizable abrasive particles are described comprising ceramic particles having outer surfaces comprising a coating of unsintered polyion and magnetic particles bonded to the polyion. In favored embodiments, the magnetic particles have a magnetic saturation of at least 10, 15, 20, 25, 30, 35, 40, 45 or 50 emu/gram. In another embodiment, an abrasive article is described comprising a plurality of magnetizable abrasive particles as described herein retained in a binder material. Also described are method of making magnetizable abrasive particles and methods of making an abrasive article comprising magnetizable abrasive particles.

An abrasive grain includes a surface having at least a first face with a first outline, and at least one second face with a second outline. The first outline does not contain any vertices, but the second outline contains at least one vertex. The abrasive grain may include a ceramic material, especially polycrystalline -Al.sub.2O.sub.3.

A chemical-mechanical polishing (CMP) system includes a head, a polishing pad, and a magnetic system. The slurry used in the CMP process contains magnetizable abrasives. Application and control of a magnetic field, by the magnetic system, allows precise control over how the magnetizable abrasives in the slurry may be drawn toward the wafer or toward the polishing pad.

A method of forming a mixture including a ceramic material into a sheet, sectioning at least a portion of the sheet using a mechanical object and forming at least one shaped abrasive particle from the sheet, such that the at least one shaped abrasive particle can have a two-dimensional shape as viewed in a plane defined by a length and a width of the shaped abrasive particle selected from the group consisting of polygons, ellipsoids, numerals, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, complex shapes having a combination of polygonal shapes, and a combination thereof.

A bonded abrasive article includes elongate shaped abrasive particles. The elongate shaped abrasive particles comprise an elongate shaped ceramic body having opposed first and second ends joined to each other by at least two longitudinal sidewalls. At least one of the at least two longitudinal sidewalls is concave along its length. At least one of the first and second ends is a fractured surface.

A coated abrasive article includes a substrate and a plurality of abrasive particles overlying the substrate, and the plurality of abrasive particles including tapered abrasive particles having a taper fraction standard deviation of at least 0.025 and not greater than 0.090.

Disclosed is a fused grain having the following chemical composition, expressed in percentages by mass on the basis of the oxides: ZrO.sub.2+HfO.sub.2: 2% to 13%; elements other than ZrO.sub.2, HfO.sub.2, Y.sub.2O; and Al.sub.2O.sub.3: 2%. Y.sub.2O.sub.3+Al.sub.2O.sub.3: made up to 100%; with 0.0065Y.sub.2O;/(ZrO.sub.2+HfO.sub.2)0.1300.

An abrasive grain is disclosed and may include a body. The body may define a length (l), a height (h), and a width (w). In a particular aspect, the length is greater than or equal to the height and the height is greater than or equal to the width. Further, in a particular aspect, the body may include a primary aspect ratio defined by the ratio of length:height of at least about 2:1. The body may also include an upright orientation probability of at least about 50%.

The present invention provides a method for producing a polishing composition which can polish an object to be polished at a high polishing speed and with fewer scratches (defects).

The present invention is a method for producing a polishing composition, the method including: preparing silica in which an intensity of a peak of a silica four-membered ring structure and an intensity of a peak derived from a silica random network structure when analyzed by Raman spectroscopy satisfy a predetermined requirement; and mixing the silica with a dispersing medium.

A method of forming a mixture including a ceramic material into a sheet, sectioning at least a portion of the sheet using a mechanical object and forming at least one shaped abrasive particle from the sheet, such that the at least one shaped abrasive particle can have a two-dimensional shape as viewed in a plane defined by a length and a width of the shaped abrasive particle selected from the group consisting of polygons, ellipsoids, numerals, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, complex shapes having a combination of polygonal shapes, and a combination thereof.