Magnetizable abrasive particles and abrasive articles including them

Patent metadata

Field	Value
Publication number	US-11072732-B2
Application number	US-201716344256-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	Oct 25, 2016
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A magnetizable abrasive particle comprises a ceramic body having an outer surface and a magnetizable layer disposed on a portion, but not the entirety, of the outer surface. The ceramic body comprises a platelet having two opposed major facets connected to each other by a plurality of side facets. The magnetizable layer completely covers one of the two opposed major facets, and the magnetizable layer has a magnetic dipole oriented perpendicular or parallel to the facet which it completely covers. A plurality of the magnetizable abrasive particles, and abrasive articles including them are also disclosed. Methods of making the foregoing are also disclosed.

First claim

What is claimed is:

1. A magnetizable abrasive particle comprising a ceramic body having an outer surface and a magnetizable layer disposed on a portion, but not the entirety, of the outer surface, wherein the ceramic body comprises a platelet having two opposed major facets connected to each other by a plurality of side facets, wherein the magnetizable layer completely covers one of the two opposed major facets, and wherein the magnetizable layer has a magnetic dipole oriented perpendicular to the facet which it completely covers.

2. The magnetizable abrasive particle of claim 1 , wherein the ceramic body comprises a shaped ceramic body.

3. The magnetizable abrasive particle of claim 2 , wherein the shaped ceramic body comprises a precisely-shaped ceramic body.

4. The magnetizable abrasive particle of claim 1 , wherein the magnetizable layer completely covers a single facet.

5. The magnetizable abrasive particle of claim 1 , wherein the platelet is triangular.

6. The magnetizable abrasive particle of claim 1 , wherein the magnetizable layer comprises magnetizable particles disposed in a binder matrix.

7. The magnetizable abrasive particle of claim 6 , wherein the binder matrix comprises an organic binder matrix.

8. A plurality of magnetizable abrasive particles according to claim 1 .

9. An abrasive article comprising a plurality of magnetizable abrasive particles according to claim 1 retained in a binder material.

10. An abrasive article according to claim 9 , wherein the abrasive article comprises a bonded abrasive wheel.

11. An abrasive article according to claim 9 , wherein the abrasive article comprises a coated abrasive article, wherein the coated abrasive article comprises an abrasive layer disposed on a backing, and wherein the abrasive layer comprises the binder material and the plurality of magnetizable abrasive particles.

12. An abrasive article according to claim 9 , wherein the abrasive article comprises a nonwoven abrasive, wherein the nonwoven abrasive comprises a lofty open nonwoven fiber web having an abrasive layer disposed on at least a portion thereof, and wherein the abrasive layer comprises the binder material and the plurality of magnetizable abrasive particles.

13. An abrasive article according to claim 9 , wherein a majority of the magnetizable abrasive particles are aligned parallel to each other.

Assignees

• 3M Innovative Properties Co

Inventors

• Nelson Thomas J
• Eckel Joseph B
• Nienaber Aaron K
• Martinez Jaime A
• Davis Eli A
• Moren Louis S

Classifications

• C08K7/00

  Use of ingredients characterised by shape · CPC title

• C04B35/624

  Sol-gel processing · CPC title

• C04B35/1115

  Minute sintered entities, e.g. sintered abrasive grains or shaped particles such as platelets (abrasives C09K3/14) · CPC title

• C04B2235/5292

  Flakes, platelets or plates · CPC title

• C04B2235/94

  Products characterised by their shape · CPC title