烧结温度与氧化锆含量对光固化3D打印ZTA陶瓷微观结构及性能的影响OA

It is difficult to explain the influence laws of process factors on the performances of light-cured 3D-printed zirconia toughened alumina(ZTA)ceramics according to standard theories.In this study,it is found that there are obvious extreme phenomena in the influence of zirconia content and sintering temperature on the microstructure and macroscopic properties of ZTA,among of them,20wt.%zirconia content is the mutation point of the microstructure response,and the zirconia grains grow significantly(up to 98.4 nm)at this addition amount and have begun to partially connect,thereby leading to a lower content of tetragonal phase,further resulting in an extremely low flexural strength of 4.97 MPa.At the same time,on the one hand,an increase in temperature is conducive to the stability of the tetragonal phase;on the other hand,high temperature also accelerates the growth of zirconia grains and promotes particle connectivity.By combining above two process parameters,it is found that whether the dispersion of zirconia in the microstructure being uniform is the main reason affecting the retention rate of the tetragonal phase.Finally,a ZTA material with 40wt.%zirconia and sintered at 1 650℃has been manufactured,with a bulk density of 3.68 g/cm3 and a flexural strength of 28.47 MPa.This discovery provides directional guidance for the design of 3D-printed high-performance ZTA ceramics and is helpful for making adaptive adjustments in scenarios with high requirements for the intensity of the service environment such as aircraft engine bearings and artificial hip joints.