Quenching stress in plasma sprayed coatings and its correlation with the deposit microstructure |
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Authors: | S Kuroda T Dendo S Kitahara |
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Affiliation: | (1) Advanced Materials Processing Division, National Research Insti- tute for Metals, 1-2-1, Sengen, Tsukuba-shi, 305 Ibaraki-ken, Japan |
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Abstract: | Quenching stress arises within a thermally sprayed splat as its thermal contraction after solidification is constrained by
the underlying solid. Dependence of the quenching stress in plasma-sprayed deposits of Ni-20Cr alloy and alumina on the substrate
temperature during spraying was discussed in conjunction with the change in the nature of the interlamellar contact between
splats. It was found by mercury intrusion porosimetry and observation of cross sections of impregnated deposits that the interlamellar
contact is improved significantly by raising the substrate temperature during deposition from 200 to 600 °C. The positive
dependence of the quenching stress on the substrate temperature in this temperature range was attributed to a stronger constraint
against thermal contraction of sprayed splats after solidification due to the improved contact. |
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Keywords: | residual stress porosity interlamella contact substrate temperature rapid solidification |
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