The emergence of digital light processing (DLP) 3D printing technology creates favorable conditions for the preparation of complex structure silicon nitride (Si₃N₄) ceramics. However, the introduction of photosensitive resin also makes the Si₃N₄ ceramics prepared by 3D printing have low density and poor mechanical properties. In this study, high-density Si₃N₄ ceramics were prepared at low temperatures by combining DLP 3D printing with precursor infiltration and pyrolysis (PIP). The Si₃N₄ photocurable slurry with high solid content and high stability was prepared based on the optimal design of slurry components. Si₃N₄ green parts were successfully printed and formed by setting appropriate printing parameters. The debinding process of printed green parts was further studied, and the results showed that samples without defects and obvious deformation can be obtained by setting the heating rate at .1°C/min. The effect of the PIP cycle on the microstructure and mechanical properties of the Si₃N₄ ceramics was studied. The experimental results showed that the mass change and open porosity of the samples tended to be stable after eight PIP cycles, and the open porosity, density, and bending strength of the Si₃N₄ ceramics were 1.30% (reduced by 97%), 2.64 g/cm³ (increased by 43.5%), and 162.35 MPa.

中文翻译：

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基于数字光加工3D打印和前驱体渗透热解制备Si3N4陶瓷

数字光处理（DLP）3D打印技术的出现，为复杂结构氮化硅（Si ₃ N ₄）陶瓷的制备创造了有利条件。但是，光敏树脂的引入也使得3D打印制备的Si ₃ N ₄陶瓷密度低，力学性能差。在这项研究中，通过将 DLP 3D 打印与前体渗透和热解 (PIP) 相结合，在低温下制备了高密度 Si ₃ N _4陶瓷。通过浆料组分的优化设计，制备出高固含量、高稳定性的Si ₃ N _{4光固化浆料。}硅₃通过设置适当的打印参数，成功打印并成型了N _{4 个绿色部件。}进一步研究了印刷坯件的脱脂工艺，结果表明，将升温速率设置为0.1°C/min，可以获得无缺陷和明显变形的样品。研究了PIP循环对Si ₃ N _{4陶瓷微观结构和力学性能的影响。实验结果表明，8次PIP循环后样品的质量变化和开孔率趋于稳定，Si 3} N ₄陶瓷的开孔率、密度和抗弯强度为1.30%（降低了97%）， 2.64 g/cm ³（提高了43.5%），162.35 MPa。