Preparation and properties of ferrimagnetic glass-ceramic foams based on pyrite slag

By employing a melt-sintering method, we prepared a new type of ferrimagnetic glass-ceramic foam (FGCF) using ferrimagnetic glass-ceramic and foaming agent SrCO3. The ferrimagnetic glass-ceramics were fabricated based on pyrite slag by a melt-quenching method. The effects of foaming agent content, sintering temperature and time on microstructure, magnetic properties, microwave absorption performance, compressive strength, and thermal conductivity of the as-obtained FGCF were analyzed. This foaming process at 1100 degrees C for 40 min with 3-wt% SrCO3 provided an FGCF with a bulk density of .693 g/cm(3), a porosity of 63.60%, a specific saturation magnetic moment of 5.2 A m(2)/kg, a compressive strength of 2.61 MPa, a thermal conductivity of .241 W/(m K), and the calculated reflection loss of -12.1 dB for a layer thickness of 9 mm.