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Calcium aluminate cements (CAC) with 0.21 wt% B 2 O 3  and without B 2 O 3  were used as binders of corundum-based castables. The properties of the castables with and without B 2 O 3  after heat treatment at 110 °C, 1,100 °C and 1,450 °C were investigated, with emphasis on studying the effect of B 2 O 3  in CAC on the volume stability and high temperature strength of the castables. It is found that a very small amount (about 0.01 wt%) of B 2 O 3  introduced by the cement alleviates the expansion of the castables after firing at 1,450 °C and decreases the high-temperature strength of castables as the presence of B 2 O 3  should generate liquid phase.

Effect of B 2 O 3 on Volume Stability and Strength of Corundum-based Castables