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US 5,779,743 AGranted
Method for making abrasive grain 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 from a dispersion comprising boehmite. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, and non-woven abrasives.
Claims26
A method for making alpha alumina-based ceramic abrasive grain, said method comprising the steps of:
- (a) preparing a homogeneous dispersion by combining components comprising liquid medium, acid, greater than 60 percent by weight boehmite, based on the total solids content of said dispersion, and, on a metal oxide basis, at least 0.1 percent by weight, based on the total metal oxide content of said dispersion, of at least one metal oxide precursor selected from the group consisting of a metal nitrate salt, a metal citrate salt, a metal formate salt, a metal chloride salt, and hydoxy iron polymer, the amount of said boehmite is greater than 60 percent by weight, based on the total weight of said dispersion;
- (b) converting the dispersion to alpha alumina-based ceramic precursor material;
- and
- (c) sintering the precursor material to provide alpha alumina-based ceramic abrasive grain having a density of greater than 90 percent of theoretical.
1 more element
A method for making alpha alumina-based ceramic abrasive grain, said method comprising the steps of:
- (a) preparing a first dispersion by combining components comprising liquid medium, acid, boehmite, and metal oxide precursor;
- (b) drying said first dispersion to provided first alpha alumina-based precursor material;
- (c) combining components comprising aqueous liquid medium, boehmite, and said first alpha alumina-based precursor material to provide a second, homogeneous dispersion comprising aqueous liquid medium, acid, greater than 60 percent by weight boehmite, based on the total solids content of said dispersion, and, on a metal oxide basis, at least 0.1 percent by weight, based on the total metal oxide content of said dispersion, of at least one metal oxide precursor selected from the group consisting of a metal nitrate salt, and a metal formate salt, the amount of said boehmite is greater than 60 percent by weight, based on the total weight of said dispersion;
- (d) converting said second dispersion to second alpha alumina-based ceramic precursor material;
- and
- (e) sintering said second precursor material to provide alpha alumina-based ceramic abrasive grain having a density of greater than 90 percent of theoretical,
- wherein said method further comprises the step, prior to step (d), of compacting the second dispersion by application of pressure of at least 3.5.times.10.sup.4 kg/m.sup.2.
4 more elements
A method for making an abrasive article, said method comprising the steps of:
- (a) preparing a homogeneous dispersion by combining components comprising liquid medium, acid, greater than 60 percent by weight boehmite, based on the total solids content of said dispersion, and, on a metal oxide basis, at least 0.1 percent by weight, based on the total metal oxide content of said dispersion, of at least one metal oxide precursor selected from the group consisting of a metal nitrate salt, a metal citrate salt, a metal formate salt, and hydoxy iron polymer, the amount of said boehmite being greater than 60 percent by weight, based on the total weight of said dispersion;
- (b) compacting the dispersion by applying a pressure of at least 3.5.times.10.sup.4 kg/m.sup.2 to the dispersion;
- (c) converting the compacted dispersion to alpha alumina-based ceramic precursor material;
- (d) sintering the precursor material to provide alpha alumina-based ceramic abrasive grain having a density of greater than 90 percent of theoretical;
- and
- (e) combining at least a plurality of said alpha alumina-based ceramic abrasive grain with binder to provide an abrasive article.
3 more elements
Dependencies are inferred from the claim text.