Crystallization behavior and mechanical properties of mica-diopside based glass-ceramics from granite wastes with different SiO2/MgO ratio

• Published in: Journal of non-crystalline solids 2023-04, Vol.605, p.122185, Article 122185
• Main Authors: Xingtao, Wang, Xiaokun, Tian, Xiaojin, Peng, Chuanxiang, Sun, Ya, Qu, Yunlong, Yue, Junfeng, Kang
• Format: Article
• Language: English
• Subjects: Crystallization behavior; Glass-ceramics; Mechanical properties; Microstructure
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2023.122185

•Granite wastes were used to prepared glass-ceramics to make good use of wastes.•Successfully generated multiphase glass-ceramics containing diopside and mica.•The effects of SiO2/MgO molar ratios of glass-ceramics were investigated.•There were excellent mechanical properties for mica-diopside based glass-ceramics. Mica-Diopside based glass-ceramics were generated by melting method from granite wastes. The effects of SiO2/MgO (S/M) molar ratios on crystallization behavior, microstructure and mechanical characteristics of glass-ceramics were investigated. The analysis indicated that with the increase of S/M, the glass transition temperature (Tg) increased. The higher heat treatment temperature facilitated the formation of Forsterite than Nepheline. With S/M ratio rising, diopside turned into the main crystal phase instead of Forsterite along with Tainiolite as the minor phase at 850 °C and 900 °C respectively. At 900 °C, the crystallinity of glass-ceramics dropped with S/M ratio increasing. Meanwhile, there were some columnar crystals interleaving with granular crystals, and the average size of crystals obviously decreased. After heated at 900 °C, their Vickers-hardness fell dramatically with S/M rising, while the fracture toughness increased initially followed by a decrease, reaching the largest value of 1.97 MPa·m1/2 with the S/M ratio of 2.82.