Antiwetting Admixtures to Alumina Silica Refractories

There are several publications [4—16] on admixtures of barium sulfate, aluminium fluoride, aluminium borate, aluminium titanate, calcium silicate (woUastonite), aluminium nitride, and silicon carbide and its combinations in alumina silica refractories for decreasing the wetting ability of Al in these refractories. [Pg.215]

According to [8, 9], the antiwetting effect of barium sulfate decreases above 1,050 °C. This probably takes place due to the transformation of barium sulfate into celsian BaAl2Si20g [Pg.215]

Barium alumina silicate celsian also may be an antiwetting agent, although is a lower degree than barium sulfate. Barium sulfate transforms into celsian in service in concretes and in phosphate-bonded bricks as well. Celsian is stable until 1,500 °C. [Pg.215]

Barium oxide also may interact with alumina, giving barium aluminium spinel or barium hexaaluminate BaO 6AI2O3 [Pg.215]

3 Refractories and Heat Insulation Materials for the Cast House [Pg.216]

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