Calcium aluminates Calcium aluminates are a range of materials obtained by heating calcium oxide and aluminium oxide together at high temperatures. They are encountered in the manufacture of refractories and cements .stable phases shown in the phase diagram are: Dicalcium aluminate , 2CaO·Al2 O3 , which exists only at pressures above 2500 MPa . The crystal is orthorhombic , with density 3480 kg·m−3 . The natural dicalcium aluminate , brownmillerite , may form at normal pressure but elevated temperature in pyrometamorphic zones , e.g., in burning coal-mining heaps . Pentacalcium trialuminate , 5CaO·3Al2 O3 , forms only under an anhydrous and atmosphere. The crystal is orthorhombic, with a density of 3067 kg·m−3 . It reacts rapidly with water . Tetracalcium trialuminate , 4CaO·3Al2 O3 , is a metastable phase formed by dehydrating 4CaO·3Al2 O3 ·3H2 O.
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