MATERIALS AND SUSTAINABLE DEVEL OPMENT: MATERIALS REMANUFACTURING AND WASTE RECYCLING |
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Effect of Nucleating Agents on Structure and Properties of CMAS Glass-ceramics |
SHI Yongheng, GOU Li
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College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
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Abstract In view of the fact that TiO2 and Fe2O3 in slag or tailings can be used as nucleating agent, three kinds of nucleating agent of TiO2, TiO2+ZrO2 and TiO2+Fe2O3 were designed to prepare CaO-MgO-Al2O3-SiO2 (CMAS) system glass ceramics by melting method and two-steps crystallization heat-treatment. The crystalline phase, microstructure, mechanical properties and dielectric properties of CMAS system glass-ceramics were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), microhardness tester and broadband dielectric impedance spectrometer, respectively. The results show that diopside and magnesium titanate occur when TiO2 is added solely; the merwinite is precipitated when TiO2 and ZrO2 are added together, and zirconium titanate is precipitated additionally when the amount of TiO2 is increased; Fe3O4 and rhoenite occur when TiO2 and Fe2O3 are added together. Although the phase composition changes with the type of nucleating agent, the grain size is within 200 nm with uniform distribution, giving rise to the mechanical properties of glass-ceramics. The Vickers hardness (HV5) of all samples is about 8 GPa, while the fracture toughness is around 1.25 MPa·m1/2. When the addition of TiO2 and Fe2O3 increases, the Vickers hardness of the sample can reach 8.15 GPa, which is conducive to the abundant addition of solid waste containing titanium or iron. The dielectric constant of the sample is about 11 with the dielectric loss about 10-3 order of magnitude under the appropriate content of nucleating agent. It is indicated that this kind of glass-ceramics also has application prospect in the field of electronic packaging or mobile communication.
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Published: 12 March 2021
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Fund:Sichuan Science and Technology Program (2018GZ0023). |
About author:: Yongheng Shi focuses on the research of inorganic functional material as a master’s degree candidate in Sichuan University from September 2017 to June 2020. Li Gou graduated from Sichuan University in 1994 with a Ph.D. of Science. From 2008 to 2009, she was a visi-ting scholar at Case Western Reserve University in the United States and is now a professor in the School of Materials Science and Engineering, Sichuan University. She is engaged in the research of thin film materials and ceramic materials, and has published more than 100 academic papers, among which more than 80 papers have been indexed by SCI and EI. |
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