Journal
SURFACE & COATINGS TECHNOLOGY
Volume 232, Issue -, Pages 747-757Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.06.091
Keywords
Plasma-sprayed coatings; Elastic constants; Resonant ultrasound spectroscopy; Internal friction; Anisotropy
Funding
- Czech Science Foundation [107/13-13616S, 101/09/0702, P108/12/1872, P108/12/P552]
- Academy of Sciences of the Czech Republic [M100761203]
- SGS program of the Czech Technical University [OHK4-002/13]
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We present a novel modification of resonant ultrasound spectroscopy (RUS) for analysis of elastic constants of plasma-sprayed coatings in the 'as sprayed' state, i.e. without removing the substrate. This modification is suitable for coatings with high internal friction (Q(-1) greater than or similar to 10(-2)), which cannot be measured by RUS in the free-standing state due to strong damping. In combination with through-transmission measurements, this modification is able to provide full anisotropic tensor of elastic constants of the coating. As an illustrative example, the proposed methodology is applied to two steel coatings prepared by water-stabilized plasma (WSP) spraying. In addition to the moduli, also the internal friction parameters of the coatings are obtained. The results of RUS are compared to moduli determined by four-point bending tests, and it is shown that the anisotropic elasticity of both examined materials exhibits an elliptic form of transversal isotropy with four independent elastic coefficients. (C) 2013 Elsevier B.V. All rights reserved.
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