Abstract
The effects of CaCO3addition on phase composition, microstructure, sintering and mechanical properties as well as thermal shock resistance (TSR) of MgO–ZrO2 composites were investigated.The results showed that appropriate amount(1-3 wt%) of CaCO3addition could promote sintering and enhance the density and cold strength. However, excessiveCaCO3 addition (5 wt%) led to the increased CO2 derived from CaCO3 decomposition, which had slightly negative effect on sintering.The fracture toughness and residual strength ratio of the samples after thermal shock increased with CaCO3addition, indicating that adding CaCO3 could improve TSR of MgO–ZrO2 composites, and the optimum amount of CaCO3 addition was 3 wt%.The improved TSR of MgO–ZrO2 composites in presence of CaCO3was attributed to the micropores formed by CO2 discharging. Meanwhile, crack deflection and branching increased fracture energy and ZrO2 acted as the bridging particles improving the ability to prevent crack propagation of the composites.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
