Mechanical Properties of Self-Toughening Gahnite-Diopside Glass-Ceramics

Abstract

Abstract: Gahnite-diopside glass-ceramics were prepared with SiO₂, Al₂O₃, ZnO, CaO and MgO as main raw materials, and the mechanical properties of glass-ceramics were improved by self-toughening technology. The influences of heat treatment parameters on the mechanical properties of glass-ceramics were studied by orthogonal test, and the relationships between the proportion of crystal phase, microscopic morphology and mechanical properties of glass-ceramics were discussed. The results show that the fracture toughness of glass-ceramics increases significantly with the increase of diopside phase ratio, but the bending strength of glass-ceramics decreases when diopside phase ratio is too high. Therefore, in order to prepare glass-ceramics with high fracture toughness and bending strength, columnar crystals are required to crisscross and granular crystals are required to fill the gaps, which together play a synergistic strengthening role. When the basic glass with heat treatment at 750 ℃ for 2 h+810 ℃ for 2 h+880 ℃ for 2 h+950 ℃ for 2 h, the fracture toughness of glass-ceramics can up to 5.1 MPa·m^1/2, the bending strength can up to 255 MPa, and the vickers hardness is 8.3 GPa.

Key words: gahnite-diopside glass-ceramics, self-toughening, fracture toughness, bending strength, heat treatment process, orthogonal test

CLC Number:

TQ171

ZHAO Jingyi, WANG Wenzhi, WANG Qichen, FU Youjie, DUAN Jiaqi, LI Minghan, JIANG Hong. Mechanical Properties of Self-Toughening Gahnite-Diopside Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1458-1465.

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