表面改性对光固化3D打印Al_(2)O_(3)陶瓷性能的影响

Effect of surface modification on performance of Al_(2)O_(3) ceramics prepared by a stereolithography-based 3D printing

陶瓷粉体表面改性是一种改善陶瓷浆料流变性能的有效方法,已应用于光固化3D打印用Al_(2)O_(3)陶瓷浆料的制备,然而目前鲜有关于表面改性对光固化3D打印Al_(2)O_(3)陶瓷烧结体性能影响的研究报道。本文采用油酸对Al_(2)O_(3)陶瓷粉体进行表面改性处理,利用光固化3D打印技术制备Al_(2)O_(3)陶瓷,研究表面改性对Al_(2)O_(3)陶瓷浆料流变性能、固化性能和Al_(2)O_(3)陶瓷烧结体力学、热学性能和微观结构的影响。结果表明:1)表面改性可降低Al_(2)O_(3)陶瓷浆料的粘度;2)表面改性可提升Al_(2)O_(3)陶瓷浆料的打印精度;3)表面改性可提升Al_(2)O_(3)陶瓷晶粒尺寸分布均匀性、增大Al_(2)O_(3)陶瓷晶粒尺寸、减少晶界处气孔数量,继而提升Al_(2)O_(3)陶瓷的弯曲强度、可靠性与热导率。

Surface modification of ceramic powder is an effective method to improve rheological property of ceramic suspension and has been applied in the preparation of Al_(2)O_(3) ceramic suspension which is used to fabricate Al_(2)O_(3) ceramic via stereolithography-based 3D printing.However,few research effort has been made to study the effect of surface modification on the properties of stereolithography-based 3D printed Al_(2)O_(3) ceramic.In this paper,oleic acids are utilized to modify the Al_(2)O_(3) ceramic powders,and Al_(2)O_(3) ceramics are prepared by stereolithography-based 3D printing.The effects of surface modification on the rheological and curing performance of ceramic suspension and the mechanical,thermal properties and microstructure of the sintered Al_(2)O_(3) ceramic are studied.The results show that 1)the viscosity of Al_(2)O_(3) ceramic suspension can be reduced by surface modification process;2)the building resolution can be improved by surface modification;3)the bending strength,reliability and thermal conductivity of Al_(2)O_(3) ceramic can be improved by surface modification due to the more uniform grain size distribution,bigger Al_(2)O_(3) grains and less pores at the grain boundaries in the Al_(2)O_(3) ceramics prepared by modified Al_(2)O_(3) powders,compared with those prepared by unmodified Al_(2)O_(3) powders.