Patent ID: 7258707
Filing Date: 2007-08-21
Classification: C03C,C04B,C09K

Abstract:
1. A plurality of abrasive particles having a specified nominal grade, wherein at least a portion of the plurality of abrasive particles are abrasive particles comprising at least 80 percent by weight of a glass-ceramic, based on the total weight of the respective abrasive particle, wherein the glass-ceramic comprises Al 2 O 3 , La 2 O 3 , Y 2 O 3 , and MgO, wherein at least 70 percent by weight of the glass-ceramic collectively comprises the Al 2 O 3 , La 2 O 3 , Y 2 O 3 , and MgO, based on the total weight of the glass-ceramic, and wherein at least 70 percent by weight of the collective weight of the Al 2 O 3 , La 2 O 3 , Y 2 O 3 , and MgO is Al 2 O 3 .