A Glass–Ceramic Derived from High TiO2-Containing Slag: Microstructural Development and Mechanical Behavior |
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| Authors: | Jeremy P. Wu Rees D. Rawlings Aldo R. Boccaccini Ivo Dlouhy Zdenek Chlup |
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| Affiliation: | Department of Materials, Faculty of Engineering, Imperial College London, London SW7 2AZ, U.K.; Brittle Fracture Group, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CZ-61662 Brno, Czech Republic |
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| Abstract: | A novel glass–ceramic material was developed from the melt of a TiO2-containing iron-making slag with additional waste glass. The high percentage (∼20 wt% TiO2) of this network-modifying oxide has promoted a crystallization of the parent glass, resulting in a fine-grained, homogeneous polycrystalline material with high mechanical properties ( E =120 GPa, flexural strength=∼180 MPa, and Vickers hardness=7 GPa) after a heat treatment at 1100°C for 2 h. The room temperature and elevated temperature fracture toughness were also studied. The main crystalline phases of the glass–ceramic material were of the pyroxene series until heat-treatment temperature reached 1000°C, at which titanium-rich perovskite and armalcolite crystals became the dominant phases. The end material is high-strength, aesthetically acceptable (metallic gray or opaque brown colored), and suitable for structural and architectural applications. |
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