US 11,926,782 B2
Magnetizable abrasive particle and method of making the same
Sergei A. Manuilov, Bayport, MN (US); Adam D. Milller, Vadnais Heights, MN (US); Laura M. Lara Rodriguez, Woodbury, MN (US); Dwight D. Erickson, Woodbury, MN (US); and Anatoly Z. Rosenflanz, Maplewood, MN (US)
Assigned to 3M Innovative Property Company, St. Paul, MN (US)
Appl. No. 17/754,654
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Oct. 12, 2020, PCT No. PCT/IB2020/059552
§ 371(c)(1), (2) Date Apr. 8, 2022,
PCT Pub. No. WO2021/074768, PCT Pub. Date Apr. 22, 2021.
Claims priority of provisional application 62/914,778, filed on Oct. 14, 2019.
Prior Publication US 2023/0193101 A1, Jun. 22, 2023
Int. Cl. C09K 3/14 (2006.01); H01F 1/11 (2006.01)
CPC C09K 3/1436 (2013.01) [H01F 1/11 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of making magnetizable abrasive particles, comprising:
forming a ceramic particle precursor from a sol-gel precursor material, the sol-gel precursor material comprising alpha-alumina, wherein forming comprises drying the sol-gel precursor material in a shaped mold cavity;
applying a coating directly to a surface of the ceramic particle precursor, wherein the, coating comprises a magnetically responsive material; and
firing the coated ceramic particle precursor to create a sintered ceramic particle and wherein, after firing, the magnetically responsive material is responsive to a magnetic field.