氧化铝陶瓷光固化浆料的制备及脱脂工艺优化研究

本文重点研究了光固化浆料固含量和粘度的关系,通过分散剂调控流变学性能,实现了高固含量浆料(45 vol%)的制备并完成打印.在此基础上我们发现,脱脂烧结工艺是决定氧化铝陶瓷成型的另一关键因素.脱脂不彻底会导致气孔、裂纹等缺陷,直接影响到陶瓷质量.鉴于此,本研究针对所制备的氧化铝陶瓷浆料有机物类型,调整了脱脂曲线,并证实通过先在真空中热解后在空气中除碳的两步脱脂方式可使有机物充分去除,不易产生气孔,最终获得了结构致密的氧化铝陶瓷材料.本文系统总结了分散剂种类、浓度及氧化铝固含量对浆料粘度的影响,优化了脱脂工艺,为复杂结构陶瓷材料的光固化成型及性能的优化提供了实验依据.

3D printing of shape-controllable alumina ceramics by using optimized slurry and sintering process

In this work, the relationship between solid content and viscosity for light curing slurry was studied. The preparation and printing of high solid content slurry (45 vol%) were realized by regulating rheological priperties of the dispersant. It is found that the processes of degreasing and sintering are key factors and cracks, which directly affect the quality of ceramics. Thus, the degreasing curve was adjusted according to the type of organic matter in the prepared alumina ceramic slurry. In addition, the two-step degreasing methods of pyrolysis in vacuum and carbon removal in air can fully remove the organic mater, which is not easy to peroduce pores. Finally, the alumina ceramic material with the dense structure was obtained. In all, the effects of dispersant type, concentration and alumina solid content on slurry viscosity were systematically analyzed and the degreasing process was optimized. We hope our work can provied an experimental basis for the light curing molding and the perormance optimization of complex structural ceramic materials.