Novel glass foam with microwave absorption properties obtained from waste glass, C and Fe2O3

A series of novel glass foam with microwave absorption properties were prepared from soda lime silica (SLS) waste glass, C and Fe ₂O ₃ by a sintering method. The glass foams were prepared with the sintering temperatures of 740, 750, 760, 770, 780, 790 and 800 °C for 15 min, respectively. Characterizations such as bulk density, estimated porosity, crystal structure, microstructure evaluation, specific saturation magnetic moment, electromagnetic wave absorption, compressive strength and thermal conductivity were used to assess the performance of the developed glass foam. The minimal bulk density of 0.64 g/cm ³ is obtained for glass foam sintered at 770 °C. Its porosity, thermal conductivity, compressive strength and specific saturation magnetic moment are 65.17%, 0.276 W/ (m ‧ K), 2.9 MPa, 10.0 emu/g, respectively. The minimum RL value less than −10 dB is -34.0 dB at 12.7 GHz for layer thickness of 7 mm.