| abstract |
A ceramic block consisting essentially of substantially homogeneous (Υ 2 O 3 )χ P 2 O 5 , where 0.95 ≤ x ≤ 1.05, having length LL, a width WW and a height HH, and a volume W of at least 8 x10 -3 m 3 essentially free of cracks throughout the volume, a density of at least 85% of the theoretical maximal density of Υ 2 0 3 ·Ρ 2 O 5 under standard conditions, and a creep rate CR at 1250°C and 6.89 MPa; where CR ≤ 8.0 x 10 -6 hour -1 and method for making the same. The method utilizes a dry process where the starting YP0 4 -based ceramic material is synthesized by reacting anhydrous P 2 O 5 with dry Y 2 O 3 powder. |