Showing papers on "Calcium aluminates published in 1970"
TL;DR: In this paper, the effects of compositional variation on glass formation in low-silica aluminate compositions were explored and it was shown that CaO is essential for glass formation at ordinary quenching rates.
Abstract: An exploratory study of the effects of compositional variation on glass formation in low-silica aluminate compositions revealed that CaO is essential for glass formation at ordinary quenching rates. Other oxides, such as Li2O, MgO, BaO, ZnO, Na2O, K2O, BeO, B2O3, and PbO, can be present in the glass in limited amounts (in some cases up to 30 mol%). A necessary, but insufficient, condition for easy glass formation is that the ratio of oxygen ions to network-forming cations (assumed to be Si4+ and Al3+) be ∼2.5. The glass-forming compositions were also characterized by liquidus temperatures below ∼1500°C (2732°F). Young's modulus ranged from 13.0 to 17.8×106 psi. Glasses containing network-modifying cations with high field strengths generally had the higher moduli. Strength (420,000 to 650,000 psi in 0.3-mil fibers), static fatigue, viscosity, annealing, and surface tension were studied to a limited extent for the composition (in mol%) 30Al2O3-4SiO2-60CaO-6MgO.
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