A third constituent is 0.4% to 0.6% by weight of {HEAD ~ a third mixture} of substantially 88% Zr2 O3 and {TAIL ~ 12% Y2 O3 powder} 
of
A third constituent is 0.4 % to 0.6 % by weight of { HEAD ~ a third mixture } of substantially 88 % Zr2 O3 and { TAIL ~ 12 % Y2 O3 powder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL