Effect of heat treatment on the thermal conductivity of plasma-sprayed thermal barrier coatings
The effect of heat treatment on the thermal conductivity of plasma-sprayed Y sub 2 O sub 3 stabilized ZrO sub 2 (YSZ) and Al sub 2 O sub 3 coatings was investigated. A heat treatment of 1300 deg C in flowing argon for 50 h was found to significantly increase the thermal conductivity of the coatings...
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| Veröffentlicht in: | Journal of thermal spray technology 2000-06, Vol.9 (2), p.204-209 |
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| container_end_page | 209 |
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| container_issue | 2 |
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| container_title | Journal of thermal spray technology |
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| creator | DUTTON, R WHEELER, R RAVICHANDRAN, K. S AN, K |
| description | The effect of heat treatment on the thermal conductivity of plasma-sprayed Y sub 2 O sub 3 stabilized ZrO sub 2 (YSZ) and Al sub 2 O sub 3 coatings was investigated. A heat treatment of 1300 deg C in flowing argon for 50 h was found to significantly increase the thermal conductivity of the coatings when compared to measurements in the as-sprayed condition. Transmission electron microscopy (TEM) examination of the microstructures of the coatings in the as-sprayed and heat-treated conditions revealed that sintering of microcracks at the splat interfaces was the main cause for the increase in thermal conductivity. In the YSZ coatings, complete closure of microcracks was frequently obtained. In contrast, microcrack closure in the AL sub 2 O sub 3 coatings was characterized by the isolated necking of particles across a microcrack rather than complete closure. A model for thermal conductivity in a solid containing oriented penny-shaped cracks was used to explain the observed increase in thermal conductivity after heat treatment. Substrates: Rene 95. |
| doi_str_mv | 10.1361/105996300770349935 |
| format | Article |
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In contrast, microcrack closure in the AL sub 2 O sub 3 coatings was characterized by the isolated necking of particles across a microcrack rather than complete closure. A model for thermal conductivity in a solid containing oriented penny-shaped cracks was used to explain the observed increase in thermal conductivity after heat treatment. Substrates: Rene 95.</description><subject>Aluminum oxide</subject><subject>Applied sciences</subject><subject>Argon</subject><subject>Coatings</subject><subject>Exact sciences and technology</subject><subject>Heat transfer</subject><subject>Heat treatment</subject><subject>Interfaces (materials)</subject><subject>Metals. 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| ispartof | Journal of thermal spray technology, 2000-06, Vol.9 (2), p.204-209 |
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| language | eng |
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| source | SpringerNature Journals |
| subjects | Aluminum oxide Applied sciences Argon Coatings Exact sciences and technology Heat transfer Heat treatment Interfaces (materials) Metals. Metallurgy Microcracks Nonmetallic coatings Plasma spraying Production techniques Surface treatment Thermal conductivity Transmission electron microscopy Yttria stabilized zirconia Zirconium dioxide |
| title | Effect of heat treatment on the thermal conductivity of plasma-sprayed thermal barrier coatings |
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