Research on the effects of surface modification of ceramic powder on cure performance during digital light processing (DLP)
Research on the effects of surface modification of ceramic powder on cure performance during digital light processing (DLP)
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DOI：
10.1016/j.ceramint.2021.10.146
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发表时间：
2021-12-22
影响因子：
5.2
通讯作者：
Wu, Shanghua
中科院分区：
文献类型：
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作者：
Li, Yanhui;Huang, Shengwu;Wu, Shanghua
数字光处理（DLP）是制造具有复杂几何形状的陶瓷零件的最重要的增材制造技术之一。与纯光敏树脂相比，陶瓷粉体的加入使陶瓷悬浮液的固化性能发生了明显的变化。在本文中，一个独特的氧化过程被用来修改包括AlN和Si 3 N4的氮化物粉末的光学性能。研究了氧化陶瓷的性能，并对陶瓷悬浮液的固化性能进行了表征。评价了氧化时间对固化性能的影响。结果表明：与未氧化的AlN相比，氧化处理使AlN的固化深度减小，过量固化宽度减小;与未氧化的Si 3 N4相比，氧化处理使Si 3 N4的固化深度增大，过量固化宽度增大，说明陶瓷粉末的折射率和吸光度对固化行为有明显的影响。此外，本研究中氧化陶瓷悬浮液的固化行为表明，固化深度与入射能量的关系符合Beer-Lambert模型，而过量固化宽度与入射能量的关系则不符合准Beer-Lambert模型，这是由于数字微镜器件（DMD）的特性造成的。
Digital light processing (DLP) is one of the most important additive manufacture technologies to fabricate ceramic parts with complex geometries. Compared with pure photosensitive resin, the cure performance of ceramic suspensions is obviously different due to the optical property change after the addition of ceramic powders. In this paper, a unique oxidation process was used to modify the optical properties of nitride powders including AlN and Si3N4. The properties of oxidized ceramics were investigated and the cure performance of ceramic suspensions was then characterized. The effect of oxidation time on cure performance was evaluated. The results showed that for AlN, oxidation process leads to the smaller cure depth and smaller excess cure width as compared with non-oxidized AlN and for Si3N4, oxidation process leads to the larger cure depth and larger excess cure width as compared with non-oxidized Si3N4, indicating that both refractive index and light absorbance of ceramic powders have obvious effects on cure behaviors. Additionally, the cure behavior of oxidized ceramic suspension in this study shows that the relationship of cure depth vs. incident energy agrees well with Beer-Lambert model, but the excess cure width vs. incident energy is not consistent with quasi Beer-Lambert model due to the nature of digital micromirror device (DMD).