Abstract:

The rare earth oxide CeO₂ not only affects the glass melting and refining process， but also controls crystallization and enhances the transmittance of glass， improving the mechanical and radiation resistance properties of glass materials， thereby expanding the application of lithium aluminosilicate （LAS） glass-ceramics in harsh environments such as aerospace. This article investigated the regulatory mechanism of trace CeO₂ doping （≤1.0%， mass fraction） on the structure， crystallization behavior， and properties of LAS glass-ceramics. The results indicate that the introduction of CeO₂ can effectively regulate the content of Q⁴ structural units in the glass network. Moderate CeO₂ （<0.5%） has an inhibitory effect on the crystallization of LAS glass-ceramics， but excessive CeO₂ （≥0.5%） actually promotes crystallization and structural depolymerization. The grain size of LAS glass-ceramics decreases first and then increases with the increase of CeO₂ content. By optimizing the CeO₂ content， the grain refinement of glass-ceramics is realized and its Vickers hardness， fracture toughness， transmittance， and radiation resistance property are improved. When the CeO₂ content is 0.3%， glass-ceramics with fine grains and excellent properties can be obtained， with a Vickers hardness of 7.45 GPa， fracture toughness of 0.93 MPa?m^1/2， and it has good radiation resistance property.

Key words: lithium aluminosilicate glass-ceramics, CeO₂, petalite, lithium disilicate, transmittance, grain refinement strengthening, radiation resistance property