Zhang Dongjiang, Liang Zhengang, Chen Xin, Pang Chunxu, Guo Xuncheng, Xu Xiqing
School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159, China.
Xi'an Modern Control Technology Research Institute, Xi'an 710065, China.
Materials (Basel). 2024 May 23;17(11):2506. doi: 10.3390/ma17112506.
Alumina ceramic is an ideal candidate for armor protection, but it is limited by the difficult molding or machining process. Three-dimensional printing imparts a superior geometric flexibility and shows good potential in the preparation of ceramics for armor protection. In this work, alumina ceramics were manufactured via 3D printing, and the effects of different monomers on the photosensitive slurry and sintered ceramics were investigated. The photosensitive slurries using dipropylene glycol diacrylate (DPGDA) as a monomer displayed the optimal curing performance, with a low viscosity, small volume shrinkage and low critical exposure energy, and each of the above properties was conducive to a good curing performance in 3D printing, making it a suitable formula for 3D-printed ceramic materials. In the 3D-printed ceramics with DPGDA as a monomer, a dense and uniform microstructure was exhibited after sintering. In comparison, the sample with trimethylolpropane triacrylate (TMPTA) showed an anisotropic microstructure with interlayer gaps and a porosity of about 9.8%. Attributed to the dense uniform microstructure, the sample with DPGDA exhibited superior properties, including a relative density of 97.5 ± 0.5%, a Vickers hardness of 19.4 ± 0.8 GPa, a fracture toughness of 2.6 ± 0.27 MPa·m, a bending strength of 690 ± 54 MPa, and a dynamic strength of 3.7 ± 0.6 GPa at a strain rate of 1200 s.
氧化铝陶瓷是装甲防护的理想材料，但受成型或加工工艺困难的限制。三维打印具有卓越的几何灵活性，在制备装甲防护陶瓷方面显示出良好潜力。在本工作中，通过三维打印制造氧化铝陶瓷，并研究了不同单体对光敏浆料和烧结陶瓷的影响。以二丙二醇二丙烯酸酯（DPGDA）为单体的光敏浆料表现出最佳固化性能，具有低粘度、小体积收缩率和低临界曝光能量，上述各性能均有利于三维打印中的良好固化性能，使其成为三维打印陶瓷材料的合适配方。在以DPGDA为单体的三维打印陶瓷中，烧结后呈现出致密均匀的微观结构。相比之下，以三羟甲基丙烷三丙烯酸酯（TMPTA）为单体的样品显示出具有层间间隙的各向异性微观结构，孔隙率约为9.8%。由于微观结构致密均匀，以DPGDA为单体的样品表现出优异性能，包括相对密度为97.5±0.5%、维氏硬度为19.4±0.8 GPa、断裂韧性为2.6±0.27 MPa·m、弯曲强度为690±54 MPa以及在应变速率为1200 s时的动态强度为3.7±0.6 GPa。
