Role of La2O3 in MgO-Al2O3-SiO2-TiO2 Glass-ceramics

Abstract

Abstract: The crystallization process and mechanical properties of MgO-Al₂O₃-SiO₂-TiO₂ glass-ceramics
containing La₂O₃ were studied by means of DTA, XRD, and SEM. With the present of La₂O₃, α-cordierite phase appears at
lower temperature and no cristobalite phase exits. The tendency of bulk crystallization of glass-ceramics is declined by the addition of La₂O₃,
which leads to small crystallinity and large crystal grains. As a result, the elastic modulus and hardness of the glass-ceramics become lower. The
fracture roughness of glass-ceramics, however, is raised by the toughening effect of rutile crystalline grains with big length-diameter ratio.

Key words: MgO-Al₂O₃-SiO₂-TiO₂ glass-ceramics, La₂O₃, crystallization, fracture toughness

CLC Number:

TQ171

CHI Yu-Shan,SHEN Ju-Yun,CHEN Xue-Xian,MIAO Zhi-Xun. Role of La₂O₃ in MgO-Al₂O₃-SiO₂-TiO₂ Glass-ceramics[J]. Journal of Inorganic Materials.

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Role of La₂O₃ in MgO-Al₂O₃-SiO₂-TiO₂ Glass-ceramics

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