Created with Sketch.

26. Sep 2019 | Application Areas

Effect of polyurea coating on flexural strength of coated ceramic tiles

The mechanism of a polyurea coating on the flexural strength of coated ceramic tiles was studied by three-point bending together with FEM simulation.

Colourful mosaic tiles in close-up.

The researchers investigated the influence of Young’s modulus and the coating position of the polyurea on the coated ceramic sample. Source: MichaelGaida / Pixabay.

The influence of Young’s modulus and the coating position of the polyurea on the coated ceramic sample were investigated. The back-coated ceramic with lower modulus polyurea (PUR240 MPa) could show higher flexural strength due to the cushion effect that reduces tensile stress around the bottom center of the substrate. The higher modulus polyurea coating (PUR866 MPa) has a significant influence on the flexural strength of the coated ceramic sample. In back-coating, the higher modulus coating increased the flexural strength of the coated ceramic sample by nearly twofold, compared to lower modulus. This higher modulus coating enhanced the stress distribution as well as storage energy in the sample.

Cushion effect contributes to reduction of stress concentration

According to the results of the FEM simulation, the mechanism which influences the stress distribution within samples during the three-point bending test was investigated. The cushion effect shows a main contribution in stress distribution by a lower modulus coating. The cushion effect occurs near the supporting pins and contributes to the stress dissipation and the reduction of stress concentration at the center-bottom of the substrate. In contrast, a thickening effect plays an important role in the case of higher modulus polyurea coatings. The center-back-coated with higher modulus polyurea acts to increase the thickness of the ceramics and dominates the effect on the flexural strength of the coated ceramic sample.

The study is published in: Journal of Coatings Technology and Research  July 2019, Volume 16, Issue 4, pp 1201–1211.

Image source: Pixabay

Resins for water-borne coatings - EC Library


Resins for Water-borne Coatings

Expand your knowledge and get fully acquainted with the various aspects of water-borne coatings - from production to properties to special features of their use! With the slow change from solvent-borne resins and coatings to water-borne coatings "Resins for waterborne coatings" is a must-read for any formulator wanting to expand their knowledge. The authors discuss important aspects of the "solvent-to-water-transition" of the past 40 to 50 years, take a deep dive into the key aspects and theories behind the production, properties and applications of these resins as well as providing an overview of how they are currently used in water-borne coatings.

This could also be interesting for you!


You are currently not logged in

To leave a comment, please log in.

For continuously improving and optimizing our websites, we use cookies. By using our website, you agree to the usage of cookies. For more information, please visit our Privacy policy.