The Impact of Cr2O3 on Electrical Properties and Mechanical Properties of Tailing Fluorphlogopite Glass-ceramic

Tailing fluorphlogopite (KMg3(Si3AlO10)F2) glass-ceramics were prepared by traditional melting method with gold tailing as main raw mate-rial. The microstructure, electrical properties and mechanical properties of the as-prepared glass-ceramics were investigated by DSC, XRD and SEM. The results revealed that the fuorophlogopite glass-ceramics with main crystalline phase of KMg3(Si3AlO10)F2 were prepared after nucleation at 650℃ for 2 h and crystallization at 860℃ for 3 h. With the increment of Cr2O3 content, the degree of crystal interlacing in the glass-ceramics improved and the aspect ratio reached 73. The tailings fluorophlogopite glass-ceramics exhibited the volume resistivity of 1012 Ω•m and 106 Ω•m at room temperature and at 600℃, respectively. Under the condition of room temperature and 100 kHz, the dielectric constant of tai-lings fluorophlogopite glass-ceramics varied in the range of 8.79-9.64 and the dielectric loss was 10-3. With the increment of Cr2O3 content, the hardness of the glass-ceramics dropped gradually and then maintained stable, while the mechanical properties of the glass-ceramics strengthened at first and then stayed almost unchanged. The mechanical properties calculated on the basis of hardness was more than 0.032. © 2019, Materials Review Magazine. All right reserved.