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Comparison of Al2O3/Er3Al5O12/ZrO2 ceramics with eutectic composition prepared using hot-pressing sintering and melt growing
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.msea.2020.138932
Shunheng Wang; Juncheng Liu

Al2O3/Er3Al5O12(EAG)/ZrO2 ceramics with eutectic composition were prepared with hot-pressing sintering and melt growing. The samples were divided into four sets, non-directionally solidified eutectic ceramics (N-DSEC), directionally solidified eutectic ceramics (DSEC), rapidly quenched eutectic ceramics (RQEC) and hot-pressing sintered ceramics (HPSC), respectively. The relationship between their microstructures and mechanical properties was investigated. The results show that RQEC has the highest hardness of 17.3 GPa, HPSC has the highest fracture toughness of 6.8 MPa m1/2, while DSEC has the highest flexural strength of 721.8 MPa. The increase of density, the improvement of microstructural uniformity and the decrease of defects are beneficial to the mechanical properties of the samples. The refinement of microstructure can increase the hardness, but not significantly within a certain range of solidification rate. The fracture toughness increases with the interface amount at the low growth rate. However, but too fast solidification rate may produce excessive residual stress and amorphous structure in the samples, and decrease the fracture toughness. In addition, the reasonable weakening of interface bonding strength could improve the fracture toughness of Al2O3/EAG/ZrO2 ceramics with high density. However, the weakened interface at the sample surface is inclined to become the starting point of failure, which is harmful to the flexural strength.
更新日期:2020-01-09

 

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