Method for making abrasive grain using impregnation, and abrasive articles
AssigneeMinnesota Mining and Manufacturing Company
InventorWilliam P. Wood
Life of this patent
Estimating the term…
Abstract
Method for making alpha alumina-based abrasive grain, wherein during an impregnation step of the method, alpha alumina-based ceramic precursor particles conchoidally fracture. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, and non-woven abrasives.
Claims45
A method for making alpha alumina-based ceramic abrasive grains, said method comprising the steps of:
- (a) impregnating a composition comprising a liquid into a porous, calcined, elongated particle of alpha alumina-based precursor having a longitudinal axis and internal interconnected pores, to cause conchoidal fracture of said elongated particle into said smaller elongate particles, said fracture occurring generally in the direction of said longitudinal axis;
- and
- (b) converting said smaller elongate particles to alpha alumina-based ceramic abrasive gram.
A method for making alpha alumina-based ceramic abrasive grains, said method comprising the step of:
- (a) preparing a dispersion by combining components comprising water, acid, and boehmite;
- (b) converting at least a portion of said dispersion into a porous, calcined, elongated particle of alpha alumina-based precursor having a longitudinal axis and internal interconnected pores;
- (c) impregnating a composition comprising a liquid into said elongated particle to cause conchoidal fracture of said elongated particle into said smaller elongate particles, said fracture occurring generally in the direction of said longitudinal axis;
- and
- converting said smaller elongate particles to alpha alumina-based ceramic abrasive grain.
A method for making alpha alumina-based ceramic abrasive grains, said method comprising the steps of:
- (a) preparing a first dispersion by combining components comprising water, acid, and boehmite;
- (b) drying the first dispersion to provide alpha alumina-based precursor material;
- (c) combining components comprising water and at least a portion of said alpha alumina-based precursor material to provide a second dispersion;
- (d) converting at least a portion of said second dispersion into a porous, calcined, elongated particle of alpha alumina-based precursor having a longitudinal axis and internal interconnected pores;
- (e) impregnating a composition comprising a liquid into said elongated particle to cause conchoidal fracture of said elongated particle into smaller elongate particles, said fracture occurring generally in the direction of said longitudinal axis;
- and
- (f) converting said smaller elongate particles to alpha alumina-based ceramic abrasive grain.
A method for making alpha alumina-based ceramic abrasive grains, said method comprising the steps of:
- (a) preparing a first dispersion by combining components comprising water, acid, and boehmite;
- (b) drying the first dispersion to provide alpha alumina-based precursor material;
- (c) combining components comprising water, boehmite, and at least a portion of said alpha alumina-based precursor material to provide a second dispersion;
- (d) converting at least a portion of said second dispersion into a porous, calcined, elongated particle of alpha alumina-based precursor having a longitudinal axis and internal interconnected pores;
- (e) impregnating a composition comprising a liquid into said elongated particle to cause conchoidal fracture of said elongated particle into smaller elongate particles, said fracture occurring generally in the direction of said longitudinal axis;
- and
- (f) converting said smaller elongate particles to alpha alumina-based ceramic abrasive grain.
A method for making an abrasive article, said method comprising the steps of:
- (a) impregnating a composition comprising a liquid into a plurality of porous, calcined, elongated particles of alpha alumina-based precursor having a longitudinal axis and internal pores, to cause conchoidal fracture of said elongated particles into said smaller elongate particles, said fracture occurring generally in the direction of said longitudinal axis;
- and
- (b) converting said smaller elongate particles to alpha alumina-based ceramic abrasive grain;
- and
- (c) combining a plurality of said alpha alumina-based ceramic abrasive grain with binder to provide an abrasive article.
Dependencies are inferred from the claim text.