论文标题
干燥条件对毛细管悬浮液的压力和体重发展的影响
Influence of drying conditions on the stress and weight development of capillary suspensions
论文作者
论文摘要
干燥过程中悬浮液的破裂是一个常见的问题。添加剂，例如粘合剂和表面活性剂可以减轻此问题，某些应用，例如印刷导电糊或烧结的绿色物体，不适合使用添加剂。毛细管悬浮液提供了一种替代配方，而无需添加剂。在这项工作中，我们使用同时的压力和体重测量来研究配方和干燥条件的影响。毛细管悬浮液更加均匀干燥，峰值应力较低，从而增加了相比裂纹的稳健性。干膜孔隙率的增加并不是减轻压力的关键驱动力。取而代之的是，产生强粒子网络的毛细管桥抵抗应力。增加相对湿度也会增强这种效果，即使对于纯悬浮液也是如此。较低的沸点二级液体，例如水，在干燥过程中持续很长时间，较高的沸点液体提供了进一步的潜力来调整干燥过程。
Cracking of suspensions during drying is a common problem. While additives, e.g. binders and surfactants, can mitigate this problem, some applications, such as printing conductive pastes or sintering green bodies, do not lend themselves to the use of additives. Capillary suspensions provide an alternative formulation without additives. In this work, we use simultaneous stress and weight measurements to investigate the influence of formulation and drying conditions. Capillary suspensions dry more homogeneously and with lower peak stresses, leading to an increased robustness against cracking compared. An increase in dry film porosity is not the key driver for the stress reduction. Instead, the capillary bridges, which create strong particle networks, resist the stress. Increasing the relative humidity enhances this effect, even for pure suspensions. While lower boiling point secondary liquids, e.g. water, persist for very long times during drying, higher boiling point liquids offer further potential to tune the the drying process.
