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US 6,053,956 AGranted
Method for making abrasive grain using impregnation and abrasive articles
Assignee3M Innovative Properties 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.
Claims60
A method for making alpha alumina-based ceramic abrasive grains, said method comprising the steps of:
- (a) impregnating an impregnation composition comprising a liquid into a plurality of initial, porous, calcined, elongated particles of alpha alumina-based precursor each having a longitudinal axis and internal interconnected pores, to cause conchoidal fracture of at least a portion of said initial elongated particles into smaller elongated particles, said fracture occurring generally in the direction of said longitudinal axis, wherein said initial elongated particles are subjected to an external pressure of at least 1.25 atm. during at least a portion of said impregnation such that the number of smaller particles is increased as compared to such impregnation of such initial particles at 1 atm.;
- and
- (b) converting said smaller elongated particles to alpha alumina-based ceramic abrasive grain.
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 plurality of initial, porous, calcined, elongated particles of alpha alumina-based precursor each having a longitudinal axis and internal interconnected pores;
- (c) impregnating an impregnation composition comprising a liquid into said initial elongated particles to cause conchoidal fracture of at least a portion of said initial elongated particles into smaller elongated particles, said fracture occurring generally in the direction of said longitudinal axis, wherein said initial elongated particles are subjected to an external pressure of at least 1.25 atm. during at least a portion of said impregnation such that the number of smaller particles is increased as compared to such impregnation of such initial particles at 1 atm.;
- and
- (d) converting said smaller elongated particles to alpha alumina-based ceramic abrasive grain.
2 more elements
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 initial porous, calcined, elongated particles of alpha alumina-based precursor each having a longitudinal axis and internal interconnected pores;
- (e) impregnating an impregnation composition comprising a liquid into said initial elongated particles to cause conchoidal fracture of at least a portion of said initial elongated particles into smaller elongated particles, said fracture occurring generally in the direction of said longitudinal axis, wherein said initial elongated particles are subjected to an external pressure of at least 1.25 atm. during at least a portion of said impregnation such that the number of smaller particles is increased as compared to such initial impregnation of such particles at 1 atm.;
- and
- (f) converting said smaller elongated particles to alpha alumina-based ceramic abrasive grain.
4 more elements
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 initial, porous, calcined, elongated particles of alpha alumina-based precursor each having a longitudinal axis and internal interconnected pores;
- (e) impregnating an impregnation composition comprising a liquid into said initial elongated particles to cause conchoidal fracture of at least a portion of said initial elongated particles into smaller elongated particles, said fracture occurring generally in the direction of said longitudinal axis, wherein said initial elongated particles are subjected to an external pressure of at least 1.25 atm. during at least a portion of said impregnation such that the number of smaller particles is increased as compared to such impregnation of such initial particles at 1 atm.;
- and
- (f) converting said smaller elongated particles to alpha alumina-based ceramic abrasive grain.
4 more elements
A method for making an abrasive article, said method comprising the steps of:
- (a) impregnating an impregnation composition comprising a liquid into a plurality of initial porous, calcined, elongated particles of alpha alumina-based precursor each having a longitudinal axis and internal pores, to cause conchoidal fracture of at least a portion of said initial elongated particles into smaller elongated particles, said fracture occurring generally in the direction of said longitudinal axis, wherein said initial elongated particles are subjected to an external pressure of at least 1.25 atm. during at least a portion of said impregnation such that the number of smaller particles is increased as compared to such impregnation of such initial particles at 1 atm.;
- and
- (b) converting said smaller elongated 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.
2 more elements
Dependencies are inferred from the claim text.