Abrasive particles having complex shapes and methods of forming same

Patent metadata

Field	Value
Publication number	US-9567505-B2
Application number	US-201514964229-A
Country	US
Kind code	B2
Filing date	Dec 9, 2015
Priority date	Jan 10, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

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%.

First claim

What is claimed is:

1. A shaped abrasive particle comprising: a body having a length (l), a width (w), and a height (h), wherein the body comprises a base surface, an upper surface, and a side surface extending between the base surface and the upper surface, wherein the base surface comprises a different cross-sectional shape than a cross-sectional shape of the upper surface, and wherein the upper surface is substantially parallel to the base surface.

2. The shaped abrasive particle of claim 1 , wherein the shape of at least one of the base surface and the upper surface is selected from the group consisting of a three-pointed star, a four pointed star, a cross-shape, a polygon, ellipsoids, numerals, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, complex shapes having a combination of polygonal shapes, and a combination thereof.

3. The shaped abrasive particle of claim 1 , wherein the shape of the upper surface is a triangle and the shape of the base surface is a circle.

4. The shaped abrasive particle of claim 1 , wherein the shape of the upper surface is a square and the shape of the base surface is a circle.

5. The shaped abrasive particle of claim 1 , wherein the shape of the upper surface is a plus shape and the shape of the base surface is a circle.

6. The shaped abrasive particle of claim 1 , wherein the shape of the upper surface is a circle and the shape of the base surface is a triangle.

7. The shaped abrasive particle of claim 1 , wherein the shape of the upper surface is a circle and the shape of the base surface is a square.

8. The shaped abrasive particle of claim 1 , wherein the upper surface is rotated with respect to the base surface to establish a twist angle.

9. The shaped abrasive particle of claim 1 , wherein the upper surface comprises undulations.

10. The shaped abrasive particle of claim 1 , wherein the base surface comprises four arms extending from a central portion, and wherein at least one of the arms comprises a width at a midpoint of the length of the arm that is less than a width of the arm at the central portion.

11. The shaped abrasive particle of claim 10 , wherein a first arm of the four arms comprises a first end width, and wherein the first end width is not greater than about 90% of the midpoint width.

12. The shaped abrasive particle of claim 1 , wherein the side surface comprises a first section and a second section joined together at an interior angle, wherein the interior angle defines an angle greater than about 80 degrees.

13. The shaped abrasive particle of claim 12 , wherein the interior angle is not greater than about 130 degrees.

14. The shaped abrasive particle of claim 12 , wherein the interior angle is within a range between approximately 85 degrees and 100 degrees.

15. The shaped abrasive particle of claim 1 , wherein the side surface comprises a fractured region intersecting at least a portion of the base surface.

16. The shaped abrasive particle of claim 15 , wherein the fractured region has a surface roughness greater than a surface roughness of the upper surface of the body.

17. The shaped abrasive particle of claim 15 , wherein the fractured region defines a portion of the body extending from the base surface, and wherein the fractured region defines a serrated edge.

18. The shaped abrasive particle of claim 15 , wherein the fractured region defines irregularly shaped protrusions and grooves extending along an edge of the base surface and the side surface.

19. The shaped abrasive particle of claim 1 , wherein the shaped abrasive particle consists essentially of alumina.

20. The shaped abrasive particle of claim 1 , wherein the shaped abrasive particle is part of a fixed abrasive article.

Assignees

• Saint-Gobain Ceram & Plastics Inc

Inventors

• Yener Doruk O
• Czerepinski Jennifer H
• Iyengar Sujatha
• Kavanaugh Michael D
• Brandes Alan J
• Arcona Christopher
• Bauer Ralph
• Boussant-Roux Yves
• Panzarella Tracy H

Classifications

• C09K3/1427

  obtained by division of a mass agglomerated by melting, at least partially, e.g. with a binder · CPC title

• C09K3/1409 Primary

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

• C01F7/442

  in presence of a calcination additive · CPC title

• C09K3/1418 Primary

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

• B01J2/26

  on endless conveyor belts · CPC title