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Surface Drying for Brittle Material Coating Without Crack Defects in Large-Area Roll-To-Roll Coating System

  • Jongsu Lee
  • Seongyong Kim
  • Changwoo LeeEmail author
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Abstract

In this study, we determined the root cause of cracks in a large-area yttria-stabilized zirconia (YSZ) coating using the roll-to-roll (R2R) slot-die coating process followed by experimental verifications. To coat brittle material without cracks, we proposed a surface drying method that maintains sufficient ductility of the dried layer to help endure bending stresses in the web transporting and winding sections. The experimental results demonstrate that the YSZ layer after surface drying has ductile characteristics and is not transferred to the roll surface in contact with the dried layer during web transport. The YSZ layer fabricated using the slot-die coating and surface drying exhibits superior roughness (6.43% of thickness of the layer) and no cracks, verifying the effectiveness of the proposed alternative. This study demonstrates that brittle materials can be fabricated using the large-area R2R coating system along with surface drying, and suggests the feasibility of the high-throughput fabrication of solid oxide fuel cells with brittle electrolyte layers.

Keywords

Roll-to-roll Slot-die coating Electrolyte Yttria-stabilized zirconia Bending stress Crack Drying 

Abbreviations

εb

Maximum bending strain

σb

Maximum bending stress

EY

Elastic modulus of yttria-stabilized zirconia layer

EP

Elastic modulus of polyethylene terephthalate film

A

Cross-sectional area of polyethylene terephthalate film

T

Initial tension

σn

Net stress in yttria-stabilized zirconia layer

Notes

Acknowledgements

This work was supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy (No. 20173010032140).

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Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical Design and Production EngineeringKonkuk UniversitySeoulSouth Korea
  2. 2.School of Mechanical EngineeringChangwon National UniversityChangwonSouth Korea
  3. 3.Department of Mechanical EngineeringKonkuk UniversitySeoulSouth Korea

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