Sintered abrasive particles, method of making the same, and abrasive articles including the same

Abstract

Sintered abrasive particles have a cellular microstructure comprising alpha alumina crystal grains of alpha alumina having a maximum dimension of less than about 3 microns are also disclosed. The sintered abrasive particles have an average particle size of less than or equal to 500 microns, and are essentially free of seed particles and alpha alumina grain size modifiers. Abrasive articles comprising a binder and a plurality of the sintered abrasive particles are also disclosed.

What is claimed is: 
     
         1 . Sintered abrasive particles having a cellular microstructure comprising alpha alumina crystal grains of alpha alumina having a maximum dimension of less than about 3 microns, wherein the sintered abrasive particles comprise shaped abrasive particles, wherein the sintered abrasive particles have an average particle size of less than or equal to 500 microns, and wherein the sintered abrasive particles are essentially free of seed particles and alpha alumina grain size modifiers. 
     
     
         2 . The sintered abrasive particles of  claim 1 , wherein the alpha alumina has an areal porosity of less than or equal to 5 percent, as measured using image analysis by cross-section at 10,000 times magnification. 
     
     
         3 . The sintered abrasive particles of  claim 1 , wherein at least a portion of the sintered abrasive particles comprises truncated pyramids. 
     
     
         4 . An abrasive article comprising a binder and a plurality of sintered abrasive particles according to  claim 1 . 
     
     
         5 . The abrasive article of  claim 4 , wherein the abrasive article is a bonded abrasive article, a non-woven abrasive article, or a coated abrasive article.