In situ study of mass loss, shrinkage and stress development during drying of cast colloidal films
In situ study of mass loss, shrinkage and stress development during drying of cast colloidal films
复制标题
DOI：
10.1016/j.jeurceramsoc.2015.03.029
复制
发表时间：
2015-09-01
影响因子：
5.7
通讯作者：
Roosen, Andreas
中科院分区：
文献类型：
--
作者：
Fu, Zongwen;Eckstein, Udo;Roosen, Andreas
在刚性基材上的粘合剂辅助胶体涂层的强制干燥过程中，由于基材对薄膜的横向限制，经常可以观察到干燥应力引起的缺陷，例如裂纹和翘曲。当前工作的目的是了解这些干燥缺陷的根源，并制定通过调整浆料成分或加工参数来避免这些缺陷的策略。本文通过透明基材偏转法和光束偏转法等不同方法观察质量损失、干燥收缩和干燥应力，研究了胶体陶瓷涂层随时间变化的干燥行为。研究了不同组成（溶剂、粒径、粘合剂和增塑剂）的薄膜中的应力发展和裂纹形成的关键时刻。讨论了干燥收缩、裂纹形成以及干燥后残余应力的测量差异的根源。 (C) 2015 Elsevier Ltd. 保留所有权利。
During constrained drying of binder-assisted colloidal coatings on rigid substrates, drying stress-induced defects such as cracks and warpage can often be observed due to the lateral confinement of the film by the substrate. The purpose of the current work is to understand the origin of these drying defects and to develop strategies for their avoidance by the adjustment of slurry composition or processing parameters. In this paper, the time-dependent drying behavior of colloidal ceramic coatings was studied in situ by observation of mass loss, drying shrinkage and drying stress by different methods, such as transparent substrate deflection and beam deflection methods. The stress development and the critical moment, at which cracks form, were investigated in films of different compositions with respect to solvent, particle size, binder and plasticizer. The origins of the measured differences in drying shrinkage, crack formation as well as residual stresses after drying were discussed. (C) 2015 Elsevier Ltd. All rights reserved.