The new experimental method was developed by use of L-shaped test pieces. The corroded L-shaped test piece was cut and polished to measure the residual size. In order to evaluate the corrosion resistance against the non-alkaline borosilicate glass, the following samples are chosen, that is, FZ-A (Fused ZrO_2 obtained from skin of ingot), FZ-B (from interior), Zircon and Tin-oxide refractory. FZ-A is slightly corroded though remarkable upward drilling is observed in FZ-B and Tin-oxide refractory. It is considered that the differences depend on their microstructure, especially the grain size and homogeneity of the components. The refractory with finer grained homogeneous microstructure shows higher corrosion resistance.
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