The preparation of glasses from gels in the ternary system of SiO2-ZrO2-B2O
3 has been investigated. The crystallization character of ZrO2 particles an
d high-temperature structure stability in the SiO2-ZrO2-B2O3 gels were anal
yzed. The effect of B2O3 as the inhibitor of crystallization was illustrate
d. Finally, the result that the purified DD3 single crystal superalloy melt
can retain high undercooling in the SiO2-ZrO2-B2O3 coating mold indicates
that the coating has an ideal non-catalytic nucleation property. (C) 2001 K
luwer Academic Publishers.