基于PμSL的铌酸钾钠陶瓷浆料制备及其脱脂工艺优化
Slurry Preparation and Debinding Process Optimization of Potassium Sodium Niobate Ceramics for PμSL
杨孟霞 1彭德锦 2刘青 1曹俊1
作者信息
- 1. 湖南大学生命医学交叉研究院，长沙 410082
- 2. 材料科学与工程学院，湖南大学，长沙，410082
- 折叠
摘要
基于无铅压电陶瓷铌酸钾钠(KNN)在光固化3D打印中存在的粉体团聚难分散、高固含量与低粘度难以兼顾、烧结易开裂等关键问题,本研究通过优化固相合成球磨工艺制备出粒径分布适度、物相纯净的KNN粉体,利用脂肪醇聚氧乙烯醚磷酸酯进行疏水改性以改善其与丙烯酸酯树脂的界面相容性,进而系统筛选分散剂与树脂单体配比,成功制备出固含量高达82wt%、粘度低至0.83Pa s且具备剪切变稀特性的高性能光固化浆料,基于面投影微立体光刻技术标定临界曝光能量与穿透深度并实现复杂多孔支架的精密成型,最终通过热重分析制定多阶段氮气保护脱脂烧结制度,有效抑制宏观裂纹产生,获得抗压强度达45MPa、结构完整的KNN陶瓷支架,从而构建了涵盖粉体可控合成、表面改性、浆料流变调控及打印工艺优化的完整技术体系,为高性能无铅压电陶瓷器件的增材制造提供了理论依据与技术支撑。
Abstract
Aiming at the critical challenges of potassium sodium niobate (KNN) lead-free piezoelectric ceramics in photocuring 3D printing, including severe powder agglomeration and poor dispersibility, the trade-off between high solid loading and low viscosity, and frequent cracking during sintering, this study optimizes the solid-state synthesis and ball-milling process to fabricate KNN powders with a moderate particle size distribution and pure phase. Hydrophobic modification using fatty alcohol polyoxyethylene ether phosphate is employed to improve interfacial compatibility between the ceramic powder and acrylate resin. Through systematic screening of dispersant and resin monomer ratios, a high-performance photocurable slurry is successfully prepared with an ultra-high solid loading of 82 wt%, a low viscosity of 0.83 Pa s, and distinct shear-thinning behavior. Based on mask projection micro-stereolithography, the critical exposure energy and penetration depth are calibrated, enabling the precise fabrication of complex porous scaffolds. Finally, a multi-stage debinding and sintering schedule under nitrogen protection is developed via thermogravimetric analysis, which effectively suppresses macrocracking and yields structurally intact KNN ceramic scaffolds with a compressive strength of 45 MPa. This work establishes an integrated technical system covering controllable powder synthesis, surface modification, slurry rheology regulation, and printing process optimization, providing a theoretical basis and technical support for the additive manufacturing of high-performance lead-free piezoelectric ceramic devices.关键词
陶瓷增材制造/铌酸钾钠（KNN）/光固化浆料/表面改性/流变性能/脱脂烧结Key words
Ceramic additive manufacturing/Potassium sodium niobate (KNN)/Photocurable slurry/Surface modification/Rheological properties/Debinding and sintering?????引用本文复制引用
杨孟霞,彭德锦,刘青,曹俊.基于PμSL的铌酸钾钠陶瓷浆料制备及其脱脂工艺优化[EB/OL].(2026-04-03)[2026-04-05].http://www.paper.edu.cn/releasepaper/content/202604-45.学科分类
材料科学/无机化学工业/高分子化合物工业
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