At the percentage by weight which the zircon +Nb2O5 or is produced from the early quantity which

摘要

Sintered product produced from a starting charge containing 75 to 99% zircon, and having the following average chemical composition by weight, the percentages by weight being based on the oxides: 60%ZrO2+HfO275%; 27%SiO234%; OTiO2; OY2O33.5%; 0.1%Nb2O5+Ta2O5=5%; and other oxides: 1.5%; for a total of 100%, The sintered product may be used in a glass furnace.