Patent ID: 8122942

Claim:
A process comprising: applying an aqueous-based facecoat slurry to a surface within a cavity to form a facecoat on the surface, the aqueous-based facecoat slurry consisting of: at least 60 weight percent of a particulate refractory material consisting essentially of yttria, at most 35 weight percent of an aqueous suspension containing a particulate inorganic binder, a thixotropic organic binder, a dispersant having the general formula H x [N(CH 2 ) y OH] z , where x has a value of 0, 1 or 2, y has a value of 1 to 8, and z=3-x, the dispersant being present in the slurry in an amount sufficient to stabilize the slurry at a pH of up to about 10, and optionally constituents excluding particulate refractory materials and inorganic binders; and contacting the facecoat with a molten quantity of a reactive material.