Patent ID: 8143182

Claim:
A fused ceramic particle having the following chemical composition: 50%<ZrO 2 +HfO 2 <70%; 10%<SiO 2 <30%; 6.5%<MgO<9.5%; Al 2 O 3 in a quantity such that the MgO/Al 2 O 3 weight ratio is in the range 2.4 to 6.6; 0.1%<Y 2 O 3 ; CeO 2 <10%; and less than 0.6% of oxides other than ZrO 2 +HfO 2 , SiO 2 , MgO, Al 2 O 3 , Y 2 O 3 and CeO 2 , in percentages by weight based on the oxides and for a total of 100%.