Method of making ceramic shaped abrasive particles, sol-gel composition, and ceramic shaped abrasive particles

Patent metadata

Field	Value
Publication number	US-10000677-B2
Application number	US-201715708910-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Jul 12, 2011
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A method includes: providing a mold having a plurality of mold cavities, wherein each mold cavity is bounded by a plurality of faces joined along common edges; filling at least some of the mold cavities with a sol-gel composition that includes a release agent dispersed therein; at least partially drying the sol-gel composition thereby forming shaped ceramic precursor particles; calcining at least a portion of the shaped ceramic precursor particles to provide calcined shaped ceramic precursor particles; and sintering at least a portion of the calcined shaped ceramic precursor particles to provide ceramic shaped abrasive particles. A sol-gel composition, shaped ceramic precursor particles, and ceramic shaped abrasive particles associated with practice of the method are also disclosed.

First claim

What is claimed is:

1. A sol-gel composition comprising a liquid vehicle and a ceramic precursor, the liquid vehicle comprising a volatile component and a release agent dispersed throughout the volatile component, wherein the sol-gel composition comprises a sol-gel, wherein the release agent comprises an oil, and wherein the ceramic precursor can be converted to alpha alumina.

2. The sol-gel composition of claim 1 , wherein the release agent is included in the sol-gel composition in an amount of from 0.08 to 4.25 percent of the theoretical oxide weight of the ceramic precursor.

3. Shaped ceramic precursor particles, wherein each shaped ceramic precursor particle comprises a ceramic precursor that can be converted into alpha alumina and is bounded by a surface having a plurality of faces joined along common edges, wherein the surface has voids on at least a portion thereof, wherein the voids are shaped as hollow ellipsoidal sections, wherein the plurality of faces comprises:
an exposed face having a portion of the voids thereon, wherein the exposed face has a first density of the voids; and
a mold face, wherein the mold face has a portion of the voids thereon, wherein the mold face has a second density of the voids, and wherein the first density of the voids is greater than the second density of the voids.

4. The shaped ceramic precursor particles of claim 3 , wherein the mold face is smaller than the exposed face.

5. The shaped ceramic precursor particles of claim 3 , wherein the exposed face is opposite the mold face.

6. Ceramic shaped abrasive particles, wherein each ceramic shaped abrasive particle comprises alpha alumina and is bounded by a surface having a plurality of faces joined along common edges, wherein the surface has voids on at least a portion thereof, wherein the voids are shaped as hollow ellipsoidal sections, wherein the plurality of faces comprises:
an exposed face having a portion of the voids thereon, wherein the exposed face has a first density of the voids; and
a mold face, wherein the mold face has a portion of the voids thereon, wherein the mold face has a second density of the voids, and wherein the first density of the voids is greater than the second density of the voids.

7. The ceramic shaped abrasive particles of claim 6 , wherein the mold face is smaller than the exposed face.

8. The ceramic shaped abrasive particles of claim 6 , wherein the exposed face is opposite the mold face.

9. The ceramic shaped abrasive particles of claim 6 , wherein the ceramic shaped abrasive particles have an abrasives industry specified nominal grade.

10. The ceramic shaped abrasive particles of claim 6 , wherein the ceramic shaped abrasive particles have a particle size less than 5 millimeters.

11. The ceramic shaped abrasive particles of claim 6 , wherein the ceramic shaped abrasive particles comprise alpha alumina.

12. The ceramic shaped abrasive particles of claim 6 , wherein the ceramic shaped abrasive particles have a true density of at least 3.8 grams per cubic centimeter.

Assignees

• 3M Innovative Properties Co

Inventors

• Boden John T
• Culler Scott R
• Erickson Dwight D

Classifications

• C04B2235/77

  Density · CPC title

• B29C33/58

  Applying the releasing agents · CPC title

• C04B2235/5427

  millimeter or submillimeter sized, i.e. larger than 0,1 mm · CPC title

• C04B35/632

  Organic additives · CPC title

• C04B2235/6027

  Slip casting · CPC title