Study on structure, properties and physical tempering of La2O3/Y2O3 containing aluminosilicate glass

Abstract

In view of the increasingly harsh service conditions of glass materials, to strengthen the traditional aluminosilicate glass and further improve its performance, rare earth oxides such as Y₂O₃ and La₂O₃ were introduced into aluminosilicate glass. The structure, properties and physical tempering of La₂O₃/Y₂O₃ containing aluminosilicate glass were studied. The result showed that Y³⁺ or La³⁺ generally does not participate in the formation process of the glass network structure. The mechanical properties of the rare earth containing aluminosilicate glass obtained a maximum value at La₂O₃ of 3.6 mol % and Y₂O₃ of 10.2 mol %, the elastic modulus reached 127 GPa, the bending strength reached 190 MPa, and the Vickers hardness reached 886 Hv. Meanwhile, the bending strength was increased from 190 MPa to 379 MPa after physical tempering with tempering temperature of 960 °C, tempering time of 5 min and cooling wind pressure of 0.24 kPa.