Abrasive particle with at most three surfaces and one corner

Patent metadata

Field	Value
Publication number	US-9914863-B2
Application number	US-201314417848-A
Country	US
Kind code	B2
Filing date	Jul 31, 2013
Priority date	Aug 2, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

An abrasive particle includes at most three surfaces and at least one edge which has a corner at least one end. The abrasive particle may contain a ceramic material, particularly polycrystalline α-Al 2 O 3 . Abrasive particles as a whole, methods for producing abrasive particles, moulds, abrasive articles, methods for producing abrasive articles, and methods for abrading a surface are also disclosed.

First claim

The invention claimed is:

1. An abrasive grain comprising:
not more than three faces;
at least one corner; and
at least one edge having a corner of the at least one corner located at least one end of the at least one edge, wherein:
a first group of three corners of the at least one corner defines a first plane,
a second group of three corners of the at least one corner defines a second plane, and
the first plane and the second plane form an angle between 70° and 140°.

2. The abrasive grain as claimed in claim 1 , wherein:
the at least one edge includes at least two edges that are not in contact with one another, the at least two edges including a first edge and a second edge,
the at least two edges are each bounded by two corners of the at least one corner, and
a first straight connecting line formed between the corners that bound the first edge is arranged at an angle of 90°±50° with respect to a second straight connecting line formed between the corners that bound the second edge.

3. The abrasive grain as claimed in claim 1 , further comprising:
at least one feature of symmetry, at least one plane of symmetry, and/or at least one axis of symmetry.

4. An abrasive grain comprising:
exactly two faces;
at least one corner; and
at least one edge having a corner of the at least one corner located at least one end of the at least one edge,
wherein the two faces are curved faces.

5. The abrasive grain as claimed in claim 1 , wherein:
the not more than three faces includes exactly three faces, and
at least two of the three faces are curved faces.

6. The abrasive grain as claimed in claim 1 , wherein the abrasive grain is comprised of a ceramic material.

7. The abrasive grain as claimed in claim 1 , wherein the at least one corner is defined at a point of the abrasive grain over which an imaginary cone can theoretically be placed such that a portion of the abrasive grain is within the imaginary cone and the point forms a tip of the imaginary cone.

8. The abrasive grain as claimed in claim 7 , wherein an opening angle of the imaginary cone is less than 150°.

9. The abrasive grain as claimed in claim 7 , wherein an opening angle of the imaginary cone is less than 120°.

10. The abrasive grain as claimed in claim 7 , wherein an opening angle of the imaginary cone is less than 90°.

Assignees

• Bosch Gmbh Robert

Inventors

• Hejtmann Georg
• Stedile Petra
• Fuenfschilling Stefan
• Oldenkotte Moritz
• Rohner Thomas
• Frei Donat
• Jenni Adrian
• Pleschinger Tony
• Lindemann Gert
• Harzer Andreas

Classifications

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C09K3/1418

  obtained by division of a mass agglomerated by sintering · CPC title

• C09K3/1409 Primary

  Abrasive particles per se (preparation of diamond C01B32/25) · CPC title

• C04B2235/945

  Products containing grooves, cuts, recesses or protusions · CPC title

• B28B1/004

  Devices for shaping artificial aggregates from ceramic mixtures or from mixtures containing hydraulic binder (from slag C04B5/00; composition of artificial aggregates C04B18/02) · CPC title