The effect of microstructural features on the mechanical properties of LZSA glass-ceramic matrix composites (Efeito das características microestruturais nas propriedades mecânicas de compósitos baseados em matriz vitrocerâmica do sistema LZSA)

This work reports on the characterization of ZrSiO 4 particulate-reinforced Li 2 O–ZrO 2 –SiO 2 –Al 2 O 3 (LZSA) glass-ceramic matrix composites. The typical physical/mechanical and chemical properties of the glass batches and the composites were measured. A composition with 60 wt.% ZrSiO 4 was preliminarily selected because it demonstrated the highest values of bending strength (190 MPa) and deep abrasion resistance (51 mm 3 ). To this same composition was given a 7 wt.% bentonite addition in order to obtain plasticity behavior suitable for extrusion. The sintered samples (1150 °C for 10 min) presented a thermal linear shrinkage of 14% and bending strength values of 220 MPa.