Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 26, Issue 3, Pages 302-314Publisher
SPRINGER
DOI: 10.1007/s11666-016-0505-6
Keywords
crack morphology; edge effect; preferential orientation; substrate stress; shear and peeling stress
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Funding
- National Basic Research Program [2013CB035701]
- Fundamental Research Funds for the Central Universities
- National Program for Support of Top-notch Young Professionals
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To explore the edge effect on intrasplat cracking of thermally sprayed ceramic splats, crack patterns of splats were experimentally observed and investigated through mechanical analysis. Both the polycrystalline splats and single-crystal splats showed obvious edge effects, i.e., preferential cracking orientation and differences in domain size between center fragments and edge fragments. In addition, substrate/interface delamination on the periphery was clearly observed for single-crystal splats. Mechanical analysis of edge effect was also carried out, and it was found that both singular normal stress in the substrate and huge peeling stress and shear stress at the interface were induced. Moreover, effective relief of tensile stress in splats is discussed. The good correspondence between experimental observations and mechanical analysis is elaborated. The edge effect can be used to tailor the pattern morphology and shed further light on coating structure design and optimization.
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