Effect of Sintering on Thermal Conductivity and Thermal Barrier Effects of Thermal Barrier Coatings

Thermal barrier coatings （TBCs） are mostly applied to hot components of advanced turbine engines to insulate the compo- nents from hot gas. The effect of sintering on thermal conductivity and thermal barrier effects of conventional plasma sprayed and nanostructured yttria stabilized zirconia （YSZ） t...

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Bibliographic Details
Published inChinese journal of aeronautics Vol. 25; no. 5; pp. 811 - 816
Main Authors WANG, Kai, PENG, Hui, GUO, Hongbo, GONG, Shengkai
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2012
Subjects
Coatings
Heat transfer
Heat treatment
laser flash method
Nanostructure
Protective coatings
sintering
Thermal barrier coatings
thermal barrier coatings (TBCs)
Thermal barriers
Thermal conductivity
thermal insulation
氧化钇稳定的氧化锆
涡轮发动机
烧结工艺
热导率
热障涂层
等离子喷涂
纳米结构涂层
隔热效果
thermal insulation
sintering
thermal conductivity
laser flash method
thermal barrier coatings (TBCs)
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Summary:Thermal barrier coatings （TBCs） are mostly applied to hot components of advanced turbine engines to insulate the compo- nents from hot gas. The effect of sintering on thermal conductivity and thermal barrier effects of conventional plasma sprayed and nanostructured yttria stabilized zirconia （YSZ） thermal barrier coatings （TBCs） are investigated. Remarkable increase in thermal conductivity occurs to both typical coatings after heat treatment, The change of porosity is just the opposite. The grain size of the nanostructured zirconia coating increases more drastically with annealing time compared to that of the conventional plasma sprayed coating, which indicates that coating sintering makes more contributions to the thermal conductivity of the nanostructured coating than that of the conventional coating. Thermal barrier effect tests using temperature difference technique are performed on both coatings. The thermal barrier effects decrease with the increase of thermal conductivity after heat treat- ment and the decline seems more drastic in low thermal conductivity range. The decline in thermal barrier effects is about 80℃ for nanostructured coating after 100 h heat treatment, while the conventional coating reduces by less than 60 ℃ compared to the as-sprayed coating.
Bibliography:thermal barrier coatings （TBCs）; sintering; thermal conductivity; thermal insulation; laser flash method
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Thermal barrier coatings （TBCs） are mostly applied to hot components of advanced turbine engines to insulate the compo- nents from hot gas. The effect of sintering on thermal conductivity and thermal barrier effects of conventional plasma sprayed and nanostructured yttria stabilized zirconia （YSZ） thermal barrier coatings （TBCs） are investigated. Remarkable increase in thermal conductivity occurs to both typical coatings after heat treatment, The change of porosity is just the opposite. The grain size of the nanostructured zirconia coating increases more drastically with annealing time compared to that of the conventional plasma sprayed coating, which indicates that coating sintering makes more contributions to the thermal conductivity of the nanostructured coating than that of the conventional coating. Thermal barrier effect tests using temperature difference technique are performed on both coatings. The thermal barrier effects decrease with the increase of thermal conductivity after heat treat- ment and the decline seems more drastic in low thermal conductivity range. The decline in thermal barrier effects is about 80℃ for nanostructured coating after 100 h heat treatment, while the conventional coating reduces by less than 60 ℃ compared to the as-sprayed coating.
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ISSN:1000-9361
DOI:10.1016/S1000-9361(11)60449-4