Density measurement of glass and liquid CaAl2O4 using a pressurized electrostatic levitator

Abstract

A pressurized electrostatic levitation furnace (PESLF) was used to measure the density of calcium aluminate with a composition of CaAl2O4 (CA) over a wide temperature range of 673–2300 K with an ultraviolet-based imaging technique. The density was measured in various gas atmospheres of O2, air and N2 at a chamber pressure of 4 × 105 Pa. The measurements under these different atmospheres suggested that the density increased when decreasing the oxygen atmosphere. The density obtained under N2, air and O2 gas atmosphere can be expressed as ρ(T) N2 = 2.91 × 103 − 0.073(T − Tm), ρ(T) air = 2.76 × 103 − 0.075(T − Tm) and ρ(T) O2 = 2.70 × 103 − 0.1(T − Tm) (kg m−3) (±2%) with Tm = 1878 K, over the range 2200 to 673 K.