Microstructure, Mechanical Properties, and Electrical Resistivities of Mica Glass-Ceramics with Flake Phlogopite and Waste Glass

Mica glass- ceramics can be applied in all kinds of electrical equipment, locomotive internal circuits in high- speed rail, ordinary electric locomotive and subway locomotive. In this study, mica glass- ceramics were prepared by sintering process using flake mica and waste glass as the main raw material with low cost. Different mica glass- ceramic samples were fabricated by changing the formula of raw materials, molding process and sintering temperature. X- ray diffraction, scanning electron microscopy, three- point bending test, and balanced- bridge technique were applied to investigate the phase, microstructure, mechanical and electrical resistivities of the samples, respectively. The results show that the optimum sintering temperature is 900 to 1000 degrees C holding for two hours, the desirable ratio is 70 wt% of mica powder while 30 wt% of glass powder. In that condition the sample could be less porosity, high flexural strength ( 63.3 MPa) and eligible electrical resistivity ( 0.4x10 13 O center dot cm).