摘要
针对传统方法难以成型复杂结构多孔陶瓷,且模具制作周期长、成本高等问题,课题组研究了基于3D打印模具和凝胶注模成型的多孔陶瓷材料的成型工艺。在使用光固化成型技术制作高精度规则树脂模具的基础上,优化凝胶注模工艺所需的低黏度、高固含量氧化铝陶瓷浆料,借助真空加压工艺成型氧化铝陶瓷坯件,以此实现复杂结构多孔陶瓷零件的净成形;针对工艺中陶瓷浆料在复杂结构中的充型问题,研究了浆料pH值、分散剂用量、真空加压工艺对陶瓷成型的影响,测试了坯体气孔率、抗压强度等参数。结果表明:在pH值为9、分散剂质量分数为0.4%、真空加压90 min条件下,能够制备出体积分数为52%的氧化铝陶瓷,气孔率为51.5%,抗压强度为40.1 MPa。使用该工艺制备的陶瓷材料结构完整、表面光洁,可以作为制备复杂结构多孔陶瓷部件的工艺。
Aiming at the difficulty in forming complex structure porous ceramics by traditional methods, and the high cost and the long cycle of the mold production, a forming process of porous ceramics based on 3 D printing mould combined with gelcasting was studied. On the basis of high-precision and regular shaped resin mold, alumina ceramic slurry with low viscosity and high solid content was optimized to realize the near-net shaped forming of porous ceramic parts with complex structure with the help of vacuum-pressure infiltration process. To solve the filling problem of ceramic slurry in complex structure, the influence of pH value of slurry, dosage of dispersant and degree of vacuum-pressure on ceramic forming process were studied and the indexes of porosity and strength of the billet were tested. The results show that alumina ceramics with volume fraction of 52% were prepared under pH value of 9, dispersant mass fraction of 0.4% and vacuum pressure for 90 minutes, with porosity was 51.5% and the compressive strength was 40.1 MPa. The ceramic material prepared by this process has a complete structure and a smooth surface, which can be used as a process to prepare porous ceramic parts with complex structure.
作者
刘杰
曹澍
俞经虎
LIU Jie;CAO Shu;YU Jinghu(School of Mechanical Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China;Key Laboratory of Advanced Food Manufacturing and Techhnoloogy,Jiangnan University,Wuxi,Jiangsu 214122,China)
出处
《轻工机械》
CAS
2021年第4期10-13,共4页
Light Industry Machinery
基金
国家自然科学基金资助项目(51605193)
江苏省自然科学基金资助项目(BK20160181)。
关键词
3D打印
凝胶注模
多孔陶瓷
真空加压工艺
3D printing
gelcasting
porous ceramics
vacuum-pressure infiltration process
