| 摘要 |
A method of manufacturing a fired, refractory magnesia brick on the basis of sintered magnesia and finely divided zirconium silicate comprises forming a mixture of 10 to 20 wt.% zirconium silicate with a grain size less than 0.1 mm, 5 to 20 wt.% zirconium silicate with a grain size of 0.1 to 0.5 mm, the total amount of zirconium silicate constituting 15 to 30 wt.% in the mixture, sintered magnesia with a grain size less than 0.1 mm in an amount corresponding to 0.4 to 1 times the amount of the zirconium sllicate with a grain size of 0.1 to 0.5 mm, the remainder constituting sintered magnesia with a grain size of 0.1 mm to 4 mm, the amounts being in each case with respect to the starting mixture of sintered magnesia and zirconium silicate. After the addition of a bonding agent, a brick-shaped body is pressed from the mixture, dried and then fired. The brick has a low porosity and a high resistance to changes in temperature and chemical attack by gases and vapours, e.g. when constituting part of the chamber grid of a glass tank furnace.
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