Abrasive particles having complex shapes and methods of forming same

Patent metadata

Field	Value
Publication number	US-2018237675-A1
Application number	US-201815962838-A
Country	US
Kind code	A1
Filing date	Apr 25, 2018
Priority date	Jan 10, 2012
Publication date	Aug 23, 2018
Grant date	—

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 generally prismatic body having a length, width, and thickness; wherein the length is greater than the width and the length is greater than the thickness; and wherein the generally prismatic body with a first end face and a second end face have a polygonal shape.

2 . The shaped abrasive particle of claim 1 , wherein the body comprises a twist along a longitudinal axis defining the length of the body.

3 . The shaped abrasive particle of claim 2 , wherein the twist angle is at least about 2 degrees.

4 . The shaped abrasive particle of claim 2 , wherein the twist angle is at least about 5 degrees

5 . The shaped abrasive particle of claim 1 , wherein the body comprises a twist along a lateral axis defining the width of the body.

6 . The shaped abrasive particle of claim 5 , wherein the twist along the lateral axis defines a lateral twist angle between two ends of the body of at least about 1 degree.

7 . The shaped abrasive particle of claim 6 , wherein the lateral twist angle is at least about 2 degrees.

8 . The shaped abrasive particle of claim 6 , wherein the lateral twist angle is at least about 5 degrees.

9 . The shaped abrasive particle of claim 1 , wherein the body comprises a twist along a vertical axis defining the height of the body.

10 . The shaped abrasive particle of claim 9 , wherein the twist along the vertical axis defines a vertical twist angle between two ends of the body of at least about 1 degree.

11 . The shaped abrasive particle of claim 10 , wherein the vertical twist angle is at least about 2 degrees.

12 . The shaped abrasive particle of claim 10 , wherein the vertical twist angle is at least about 5 degrees.

13 . The shaped abrasive particle of claim 1 , wherein the generally prismatic body comprises an odd number of major surfaces.

14 . The shaped abrasive particle of claim 1 , wherein the generally prismatic body comprises a center of mass and a geometric midpoint and wherein the center of mass is displaced from the geometric midpoint by a distance (D h ) of at least about 0.05(h) along a vertical axis of the body defining the height.

15 . The shaped abrasive particle of claim 14 , wherein the center of mass is closer to a base surface of the body than the geometric midpoint.

16 . The shaped abrasive particle of claim 1 , wherein the generally prismatic body comprises a center of mass and a geometric midpoint and wherein the center of mass is displaced from the geometric midpoint by a distance (D w ) of at least about 0.05(w) along a lateral axis of the body defining the width.

17 . The shaped abrasive particle of claim 16 , wherein the center of mass is closer to a base surface of the body than the geometric midpoint.

18 . The shaped abrasive particle of claim 1 , wherein the generally prismatic body comprises a center of mass and a geometric midpoint and wherein the center of mass is displaced from the geometric midpoint by a distance (D l ) of at least about 0.05(l) along a longitudinal axis of the body defining the length.

19 . The shaped abrasive particle of claim 18 , wherein the center of mass is closer to a base surface of the body than the geometric midpoint.

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

Assignees

• Saint Gobain Ceramics

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

• C09K3/1418 Primary

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

• C01F7/442

  in presence of a calcination additive · CPC title

• B24D3/00 Primary

  Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents · CPC title