Effect of the microstructure on the mechanical properties of CaO–P2O5–SiO2–MgO–F− glass ceramics

CaO–MgO–P2O5–SiO2–F− glass-ceramic which contains apatite and mica crystalline phases can be used to repair and reconstruct diseased or damaged bones and teeth because of their biocompatibility and bioactivity. Like other glass-ceramics, the mechanical properties of material depend on their microstructure. In this paper, the relationship between the microstructure and the mechanical properties of CaO–MgO–P2O5–SiO2 glass-ceramics containing fluorophlogopite and fluorapatite was analyzed with DTA, SEM, XRD techniques and some mechanical testing methods. The results showed that the sample heated at 810 °C for 4 h had smaller crystalline size and less volume fraction of fluorophlogopite, so it had higher bending strength (190 MPa) and higher crack toughness (2.63 MPa·m1/2).