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Homogeneous, rigid glass-mica composites have been synthesized from mixtures of Canadian natural mica flakes of the phlogopite type and ground glass powders prepared from recycled soda-lime waste glasses by a simple sintering process. By means of selection of compositions and processing techniques, composites can be fabricated into products that exhibit a cellular structure, a highly densified structure, and multilayer and sandwich structures. The cellular structure composite has a thermal conductivity in the range of 0.165 to 0.230 W/m·°C when measured over the temperature range 25 to 180°C, and a compressive strength of about 0.874 MPa; the highly densified composite, on the other hand, has a thermal conductivity in the range of 0.155 to 0.330 W/m·°C, a compressive strength in excess of 40 MPa, and an instantancous coefficient of thermal expansion of 5.8 × 10−6/°C at 100°C. These glass-mica composites exhibit qualities such as insulating efficiency, safety, mechanical strength, and durability that are suitable for engineering applications in building structures or other systems.
rigid thermal insulator, phlogopite mica, waste glass, cellular and densified (ceramics), multilayer and sandwich (products), mechanical strength, thermal conductivity, durability, saturation coefficient
Research Assistant Professor, Center for Building Studies, Concordia University, Montreal, Quebec