Coated abrasive article having alumina-zirconia abrasive particles and glass diluent particles

Abstract

A coated abrasive article having an abrasive layer formed from alumina-zirconia (AZ) abrasive particles and glass diluent particles was found to have excellent grinding performance when compared to abrasive layers formed from 100 percent AZ particles or a blend of 60 percent AZ particles and 40 percent aluminum oxide particles. Replacing the significantly harder aluminum oxide particles with the much softer glass particles while still being able to maintain the same performance of the abrasive disc was an unexpected result.

1 . A coated abrasive article comprising:
 a backing having a make coat attaching AZ abrasive particles and glass diluent particles to the backing, the AZ abrasive particles and the glass diluent particles forming an abrasive layer;   a size coat applied over the AZ abrasive particles and the glass diluent particles; and   wherein a size ratio between the average size of the glass diluent particles divided by the average size of the AZ abrasive particles is from 0.5 to 2.5; and the abrasive layer comprises from 25 to 75 percent by weight AZ abrasive particles and from 75 to 25 percent by weight glass diluent particles.   
     
     
         2 . The coated abrasive of  claim 1  wherein the abrasive layer consists essentially of AZ abrasive particles and glass diluent particles. 
     
     
         3 . The coated abrasive article of  claim 1  wherein the glass diluent particles comprise 60-75 percent silicon dioxide, 12-18 percent sodium oxide, and 5-12 percent calcium oxide. 
     
     
         4 . The coated abrasive article of  claim 1 , wherein the AZ abrasive particles are selected from the group consisting of ANSI grade 12, 16, 20, 24, 30, 36, 40, 50, 60, 80, 100 and 120. 
     
     
         5 . The coated abrasive article of  claim 1 , wherein the abrasive layer has from 70 to 95 percent of a maximum closed coat particle weight. 
     
     
         6 . The coated abrasive article of  claim 1 , wherein the size ratio between the average size of the glass diluent particles divided by the average size of the AZ abrasive particles is from 0.8 to 1.3. 
     
     
         7 . The coated abrasive article of  claim 1 , wherein the abrasive layer comprises from 50 to 70 percent by weight AZ abrasive particles and from 50 to 30 percent by weight glass diluent particles.