硅藻土光固化成型浆料和多孔陶瓷的制备

本文成功开发了用于光固化成型的树脂基硅藻土浆料,系统探讨了分散剂种类、含量及固含量对硅藻土浆料流变特性的影响,并对其作用机理进行了分析,获得了用于光固化成型的高固含量、低黏度的硅藻土浆料,并采用3D陶瓷光固化设备制备了结构复杂的硅藻土多孔陶瓷。结果表明,BYK2009为硅藻土浆料的最佳分散剂,且当分散剂相对粉体质量为3%时,浆料黏度最低。成功制备出粉体体积分数为40%的硅藻土浆料,在剪切速率为30 s^-1时,硅藻土浆料黏度为17.30 Pa·s。在900 ℃烧结时得到显气孔率为51.30%、抗弯强度为(46.28±2.63) MPa的硅藻土多孔陶瓷。本研究为光固化成型具有复杂多级孔结构的硅藻土载体提供了参考。

Fabrication of Diatomite Slurries and Diatomite Porous Ceramics Based on Stereo Lithography Apparatus

In this paper, the resin-based diatomite slurries for stereo lithography apparatus were successfully developed. The effects of dispersant types, content and solid content on the rheological properties of diatomite slurries were systematically discussed, and the mechanism of dispersant was analyzed. The diatomite slurries with high solid content and low viscosity for stereo lithography apparatus were obtained, and diatomite porous ceramics with complex structure were prepared by 3D ceramic stereo lithography equipment. Results show that BYK2009 is the best dispersant for diatomite slurries, and the viscosity is the lowest when the dispersant is 3% relative to the powder mass. Diatomite slurries with 40% (volume fraction) powder are prepared, and the viscosity of diatomite slurry is 17.30 Pa·s at the shear rate of 30 s^-1. Diatomite porous ceramics sintered at 900 ℃ have apparent porosity of 51.30% and bending strength of (46.28±2.63) MPa. This study provides a reference for preparing diatomite carriers with complex porous structure based on stereo lithography apparatus.