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