Circumventing brittleness of 3D-printed Al_(2)O_(3)cellular ceramic structures via compositing with polyurea  

作　　者：Xue-Qin Zhang Ru-Yue Su Xiong Gao Jing-Yi Chen Guo Liu Ru-Jie He Ying Li 

机构地区：[1]Institute of Advanced Structure Technology,Beijing Institute of Technology,Beijing 100081,China [2]Department of Mechanical Engineering,City University of Hong Kong,HongKong999077,China

出　　处：《Rare Metals》2024年第11期5994-6005,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52275310);the Open Project of State Key Laboratory of Explosion Science and Technology(No.QNKT22-15);the BIT Research and Innovation Promoting Project(No.2022YCX020)。

摘　　要：Benefiting from excellent mechanical properties and low density,cellular ceramic structures(CCSs)are competitive candidates as structural components.However,inherent brittleness from strong chemical bonds among atoms extremely impeded CCSs'application.Natural materials occupied outstanding strength and toughness simultaneously due to the dual-phase interpenetrated structure.Inspired by natural materials,it was proposed to fabricate coating covered and fulfilled polyurea/CCS interpenetrated composites(C/CCSs and B/CCSs)to circumvent the brittleness of 3D-printed Al_(2)O_(3)CCSs.It was demonstrated that polyurea coating had less effect on the compressive strength of C/CCSs but tremendously improved their energy-absorbing ability.The energy-absorbing ability of C/CCSs was improved from26.48-52.57 kJ·m^(-3)of CCSs to 1.04-1.89 MJ·m^(-3)because of the extended plateau stage.Furthermore,compressive strength and energy-absorbing ability of B/CCSs were strengthened to 1.33-1.36 and 2.84-4.61 times of C/CCSs,respectively.Besides,failure mode of C/CCSs changed from localized deformation to fracturing entirely with the increase in relative density of CCSs inside,which was the same as that of CCSs.However,with the help of polyurea coating,C/CCSs were still intact at strains up to60%,which would neve r fail catastrophically as CCSs at low strains.B/CCSs tended to fracture as a whole,which was not influenced by relative density of pristine CCSs.It was believed that this work provided a creative way to circumvent the brittleness of CCSs and improve their mechanical performances.

关 键 词：Cellular ceramic structures Dual-phase interpenetrated composites Energy-absorbing ability Compressive strength 3D printing 

分 类 号：TQ174.1[化学工程—陶瓷工业] TP391.73[化学工程—硅酸盐工业]