基于3D打印Al_(2)O_(3)梯度点阵的陶瓷/聚脲复合结构研究

Preparation and Mechanical Properties of Ceramic/Polyurea Composite Structures Based on 3D Printed Al_(2)O_(3) Gradient Lattice Structure

自然界中的硬/软结合多相复合结构为新型承载抗冲击结构设计提供了思路。本文设计了一种具有梯度结构的Al_(2)O_(3)陶瓷点阵,采用光固化3D打印技术实现制备,随后将聚脲浸渗入Al_(2)O_(3)梯度点阵获得陶瓷/聚脲复合结构,最后对Al_(2)O_(3)梯度点阵与陶瓷/聚脲复合结构的力学性能进行了测试与表征。研究发现,FGC-0和FGC-30两种Al_(2)O_(3)陶瓷点阵的抗压强度和能量吸收分别为11.03 MPa、6.7 MPa和0.075 MJ/m^(3)、0.033 8 MJ/m^(3)。与此同时,FGCS-0和FGCS-30两种梯度复合结构的抗压强度和能量吸收分别达到12.123 MPa、17.479 MPa和0.360 68 MJ/m^(3)、0.536 43 MJ/m^(3)。梯度复合结构相较于对应的Al_(2)O_(3)陶瓷点阵,其抗压强度和能量吸收分别提升了160.9%和1 487.1%。研究表明基于光固化3D打印梯度点阵的陶瓷/聚脲复合结构具有更加优异的力学性能,有望在新型承载抗冲击结构中获得创新应用。

The hard/soft combined multiphase composite structures in nature are considered for the design of new load-bearing impact-resistant structures.An Al_(2)O_(3) ceramic lattice with gradient structure was designed and prepared by light-cured 3D printing technology,and then polyurea was infiltrated into the Al_(2)O_(3) gradient lattice to obtain the ceramic/polyurea composite structure.The mechanical properties of the Al_(2)O_(3) gradient lattice and the ceramic/polyurea composite structure were tested and characterized.It was found that the compressive strength and energy absorption of two Al_(2)O_(3) ceramic lattices,FGC-0 and FGC-30,were 11.03 MPa,6.7 MPa and 0.075 MJ/m^(3),0.0338 MJ/m^(3),respectively.Meanwhile,the compressive strength and energy absorption of two gradient composite structures,FGCS-0 and FGCS-30,were 12.123 MPa,17.479 MPa and 0.036068 MJ/m^(3),0.53643 MJ/m^(3),respectively.Compared with the corresponding Al_(2)O_(3) ceramic lattice,the compressive strength and energy absorption of the gradient composite structures were improved by 160.9%and 1487.1%,respectively.The study indicates that the ceramic/polyurea composite structure based on light-cured 3D printed gradient lattice has improved mechanical properties and its innovative applications will be used in new load-bearing impact resistant structures.