In the process of Electrode ink preparation we generally use binder solvent and glycerol at some wt ratios which are mixed thoroughly and coated on substrate to achieve required thickness. The coated substrate is sintered at sintering temperature .
But, I find that after sintering the coated electrode ink layer on substrate suffers shrinkage cracks. Can anyone suggest me what kind of precaution should be taken to avoid such cracks?
“It was found that cracking always occurred no matter how slow the heating rate (or strain rate) was at this earliest stage. However, it was possible to avoid cracking by modifying the ink rheology. These observations indicate that the cracks observed after sintering probably originated from a crack network in the green film which was not observable because the crack openings were too small. This suggests a general principle: namely, that cracks in sintered films can be avoided by preparation of crack-free green films.” https://arxiv.org/ftp/arxiv/papers/1502/1502.01878.pdf https://patents.google.com/patent/US20120183877
Respected Sir,
Thank you for taking time in addressing my problem and for sharing few related documents. I do not use any screen printing machine to coat the ink on substrate. I coat the ink manually by brush. Secondly, how should I differ the ink rheology. I mean, is it in terms of weight ratios or viscous nature of ink?
I kindly request you to help me in understanding to achieve crack free green film.
Thanking you in advance.
Regards,
G.Harshitha
Understanding the Relationship between Ink Rheology and Film Properties for Screen-Printed Nickel/Scandia-Stabilized-Zirconia Anodes by M. R. Somalua,b, A. Muchtara , M. G. Babolia , V. Yufitb , I. P. Shapiroc , P. Xiaoc and N. P. Brandonb
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.926.4079&rep=rep1&type=pdf
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