| abstract |
A composite material consisting essentially of ZrSiO 4 and sintering additives selected from Type I, Type II and Type III sintering additives and combinations thereof in amounts indicated below: n Type I: 0.0-0.1 wt % selected from Fe 2 O 3 , SnO 2 , oxide glasses, and mixtures and combinations thereof Type II: 0.1-0.8 wt % selected from TiO 2 , SiO 2 , VO 2 , CoO, NiO, NbO, and mixtures and combinations thereof Type III: 0.0-0.8 wt % selected from Y 2 O 3 , ZrO 2 , CaO, MgO, Cr 2 O 3 , Al 2 O 3 , and mixtures and combinations thereof nwherein the amount of sintering additives are weight percentages on an oxide basis of the total weight of the composition, as well as method for making such composite material. The present invention is particularly useful for making large-size refractory bodies resistant to creep at an elevated operating temperature, such as an isopipe for fusion draw glass making processes. |