Silica, Silicon Carbide and Zirconia Refractories

Refractory silica bricks, containing 96 to 98 % of Si02, are bonded using 1 to 3 % of CaO added as a milk of lime or as hydrate, together with a small quantity of a finely divided sodium-iron-silicate flux [32.3]. 

Lime is also used as a bonding and stabilising agent in the production of silicon carbide and zirconia refractories [32.4]. 

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