Load effect on the mechanical behaviour of zirconia-reinforced lithium silicate glass ceramics

The mechanical behaviour of pre-crystallized and crystallized zirconia-reinforced lithium silicate glass ceramics (ZLS) using micro-indentation techniques is reported. Vickers micro-indentations were conducted on these materials at the load 0.245 N–9.8 N 4.9 to determine effect hardness fracture toughness, respectively. increased with by 78.2% (ANOVA, p < 0.05) 163% ZLS, respectively, indicating occurrence reverse indentation size (RISE) both materials. toughness 20% 12.3% Hardness data analyzed Meyer's, indentation-induced cracking (IIC), proportional specimen resistance (PSR), modified PSR, Hays–Kendall elastic plastic deformation (EPD) models. Meyer's IIC models described RISE satisfactorily. EPD provided consistent load-independent hardnesses while PSR model gave erratic for continuum intrinsic compressive yield strengths which those obtained from Tabor relation, implying as most successful. brittleness index predicted better machinability ZLS than ZLS. Finally, variations might account different micro-material removal mechanisms in sharp abrasive machining