HEMA-TBA凝胶体系制备多孔氧化铝陶瓷

发布时间：2018-05-11 05:43

本文选题：多孔陶瓷 + 凝胶注模　；参考：《无机材料学报》2017年07期

【摘要】：采用HEMA-TBA凝胶体系制备具有高气孔率,高强度的多孔氧化铝陶瓷,研究多孔氧化铝陶瓷的浆料和坯体制备工艺,并系统研究了分散剂含量和固相体积分数对浆料粘度和悬浮稳定性的影响、干燥和单体含量对生坯性能的影响以及固相体积分数和烧结温度对烧结体微观结构的影响。结果表明:加入柠檬酸可以使浆料粘度降低,稳定性提高,柠檬酸加入量达到2wt%后浆料粘度和稳定性趋于稳定;固相体积分数的增加会导致浆料粘度和稳定性的增加;生坯在干燥过程中的收缩比水基体系小很多,干燥时间也相对更短;单体含量对生坯强度影响较大,当单体含量为25wt%时,生坯强度较高;通过选择不同的固相体积分数和烧结温度,可以有效地控制烧结体的微观结构,气孔率的变化范围在40%~65%,同时烧结体强度也会随之发生变化,变化范围在5.7~91.2 MPa。
[Abstract]:Porous alumina ceramics with high porosity and strength were prepared by HEMA-TBA gel system. The effects of dispersant content and solid volume fraction on the viscosity and suspension stability of the slurry, the effects of drying and monomer content on the properties of raw billet and the effects of solid volume fraction and sintering temperature on the microstructure of the sintered body were studied systematically. The results show that adding citric acid can decrease the viscosity and increase the stability of the slurry, the viscosity and stability of the slurry tend to be stable when the citric acid content reaches 2 wt%, and the increase of the volume fraction of solid phase leads to the increase of the viscosity and stability of the slurry. The shrinkage of raw billet in drying process is much smaller than that in water base system, and the drying time is relatively shorter, and the monomer content has a great influence on the strength of raw billet, and when the monomer content is 25 wt%, the strength of raw billet is higher. By selecting different solid volume fraction and sintering temperature, the microstructure of the sintered body can be effectively controlled. The porosity varies from 40 to 65 and the sintered strength also changes with it, which ranges from 5.7 to 91.2 MPa.
【作者单位】：中南大学材料科学与工程学院;上饶市鼎新化工有限公司;
【基金】：国家青年自然科学基金(51202296)~~
【分类号】：TQ174.1

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