STUDY OF HIGH TEMPERATURE OXIDATION OF DUPLEX AND FUNCTIONALLY GRADED MATERIALS OF THERMAL BARRIER COATING (FGM TBC)

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SAEIDI BEHNAZ; SABOUR ROUHAGHDAM A.R.; KHODAMI A.M.

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Journal: Year:2008 | Volume:41 | Issue:8 (110) Page(s): 1031-1042

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Title

STUDY OF HIGH TEMPERATURE OXIDATION OF DUPLEX AND FUNCTIONALLY GRADED MATERIALS OF THERMAL BARRIER COATING (FGM TBC)

Author(s)

SAEIDI BEHNAZ | SABOUR ROUHAGHDAM A.R. | KHODAMI A.M. | Issue Writer Certificate

Keywords

HIGH TEMPERATURE OXIDATIONQ3

ISOTHERMAL OXIDATIONQ3

MCRALYQ3

TBCQ3

FUNCTIONALLY GRADED MATERIALSQ3

THERMAL BARRIER COATINGQ3

Abstract

Although the number and the severity of TBC applications on hot section components have dramatically increased in the past decade, premature spallation failure of TBCs, due to mismatch of thermal expansion at the metal/ceramic interface of the two coating layers, during service is still an overriding concern. Therefore, FUNCTIONALLY GRADED MATERIALS (FGMs) with a gradual compositional variation have been introduced. In this study, comparison of properties of two different types of THERMAL BARRIER COATINGs (TBCs) was made to improve the surface characteristics on high temperature components. These TBCs consisted of a duplex TBC and a five layered functionally graded TBC. In both coatings, Yittria partially stabilized Zirconia topcoat (YSZ) was deposited by air plasma spraying (APS) and NiCrAlY bond coat was deposited by high velocity oxyfuel spraying (HVOF). In FGM coating, functionally graded layer was sprayed by air plasma process by varying the feeding ratio of YSZ/NiCrAlY powders using two separate powder feeders. Then, ISOTHERMAL OXIDATION was carried out at 950oC in atmosphere to obtain the plot of mass change vs. time to study oxidation kinetic. Micro structural and compositional changes of coating, oxides formed during service were examined by optical microscope and SEM with EDS. FGM coating failed after 2100 h and duplex coating failed after 1700 h. Finally, it was found that FGM coating is more qualified than duplex TBC and stands for a longer time.

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APA: Copy

SAEIDI, BEHNAZ, SABOUR ROUHAGHDAM, A.R., & KHODAMI, A.M.. (2008). STUDY OF HIGH TEMPERATURE OXIDATION OF DUPLEX AND FUNCTIONALLY GRADED MATERIALS OF THERMAL BARRIER COATING (FGM TBC). JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 41(8 (110)), 1031-1042. SID. https://sid.ir/paper/14393/en

Vancouver: Copy

SAEIDI BEHNAZ, SABOUR ROUHAGHDAM A.R., KHODAMI A.M.. STUDY OF HIGH TEMPERATURE OXIDATION OF DUPLEX AND FUNCTIONALLY GRADED MATERIALS OF THERMAL BARRIER COATING (FGM TBC). JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2008;41(8 (110)):1031-1042. Available from: https://sid.ir/paper/14393/en

IEEE: Copy

BEHNAZ SAEIDI, A.R. SABOUR ROUHAGHDAM, and A.M. KHODAMI, “STUDY OF HIGH TEMPERATURE OXIDATION OF DUPLEX AND FUNCTIONALLY GRADED MATERIALS OF THERMAL BARRIER COATING (FGM TBC),” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 41, no. 8 (110), pp. 1031–1042, 2008, [Online]. Available: https://sid.ir/paper/14393/en

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