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Imaging Slit Pores Under Delaminated Splats by White Light Interference

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Abstract

The slit pores under delaminated films significantly contribute to the properties of the film and the coating. In the present study, a novel and practical technique, the white light interference method, is proposed to characterize the slit pores covered by the 8YSZ and LZ splats. In this method, only an ordinary optical microscopy (OM) is used. Interestingly, colorful Newton’s rings and parabolic shapes of the slit pores were clearly observed by OM. The crack spacing and the shapes of the slit pores captured by OM were in good agreement with those obtained by scanning electron microscopy and focus ion beam. Moreover, this is the first time when successful quantitative imaging of the slit pores under the thermal spray splats is achieved. Besides, mechanical analyses were carried out, and the results were consistent with those obtained by OM. In addition, the essential fact that the slit pores were mainly caused by transverse cracking/delamination in the thermal spray coatings was clarified. These results indicate that white light interference is an excellent method to characterize the slit pores under smooth and transparent films.

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Acknowledgments

The present project is supported by National Basic Research Program (No. 2013CB035701), the Fundamental Research Funds for the Central Universities, and the National Program for Support of Top-notch Young Professionals.

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  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, People’s Republic of China

    Lin Chen, Li-li Gao & Guan-Jun Yang

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  1. Lin Chen
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  2. Li-li Gao
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  3. Guan-Jun Yang
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Correspondence to Guan-Jun Yang.

Appendix: Splat Morphologies by White Light Interference

Appendix: Splat Morphologies by White Light Interference

See Fig. 15.

Fig. 15
figure 15

The surface morphologies of (a-c) 8YSZ and (d-f) LZ splats at the deposition temperature of (a, d) 200, (b, e) 400, and (c, f) 500 °C by OM. Colorful Newton’s rings were widely observed

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Chen, L., Gao, Ll. & Yang, GJ. Imaging Slit Pores Under Delaminated Splats by White Light Interference. J Therm Spray Tech 27, 319–335 (2018). https://doi.org/10.1007/s11666-018-0686-2

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