Characterisation of air plasma sprayed TBC coating during isothermal oxidation at 1100 degrees centigrade

• Autorzy: Swadźba L. , Moskal G. , Mendala B. , Gancarczyk T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the research was characterization of failure modes of air plasma sprayed thermal barrier coatings system in isothermal oxidation test conditions at 1100 degrees centigrade. Design/methodology/approach: The research allowed the identification of microstructural changes that take place during oxidation test of TBC system in area of ceramic top-layer, bond coat and superalloy substrate. The examinations were conducted on specimens after 50, 120, 500, 1000, 1500 and 2000 h of exposition. The scope of the research encompassed a microstructural analysis with the use of macro and micro investigation - LM, SEM microscopy. Findings: It was found that the lifetime of commercially quality TBC system is related to progress of degradation in area of bond coat and ceramic top layer. During isothemal oxidation, the bond coat in the TBCs was oxidized to form an alumina and a mixed oxide layer between the top coat of yttria stabilised zirconia (YSZ) and bond coat of NiCoCrAlY alloy. At the moment of oxidation acceleration, the cracks initiation and propagation was observed in the mixed oxide layer near the YSZ. The crack propagation inducted the delamination and spallation of top coat after 1000 h oxidation. Research limitations/implications: The discussed research proves that main reason of degradation in TBC system is related to progressive development of cracks at the interface of the thermally grown oxide with bond coat, within the top coat or at its interface with TGO. Practical implications: The results obtained allow the determination of the degree of life-time lost of the investigated TBC system and specification of the time of safety operation. Originality/value: The results obtained are valuable contribution to durability characterization of TBC systems. They enable the identification of the degradation mechanisms, which enhances the durability and safety of high temperature operation.

Słowa kluczowe

EN

coating; thin coatings; thick coatings; TBC; degradation; oxidation

PL

powłoka; cienkie powłoki; powłoki grube; TBC; degradacja; utlenianie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 21, nr 2
• Strony: 81--84
• Opis fizyczny: Bibliogr. 15 poz., fot., rys.

Twórcy

autor

Swadźba L.

autor

Moskal G.

autor

Mendala B.

autor

Gancarczyk T.

• The Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

• [1] F. Cernusci, P. Bianchi, M. Leoni, P. Scardi, Journal of Thermal Spray Technology 8 (1) (1999) 102.
• [2] J.T. DeMasi-Marcin. D.K. Gupta, Surface and Coating Technology, 68 69 (1994) 1.
• [3] J. Wigren. L. Pejryd, in, C. Coddet (Ed.), Proceedings of the 15th International, Thermal Spray Conference on Thermal Spray Meeting the Challenges of the 21st Century, France, SMInternational, Materials Park, OH, USA, 1998, 1531.
• [4] K.A. Khor, S. Jana, Pulsem laser processing of plasma sprayed thermal barrier coating, Journal of Materials Processing Technology 66 (1996) 4-8.
• [5] B. Siebert, C. Funke, R. Vaben, D. Stover, Changes in porosity and Young's Modulus due to sintering of plasma sprayed thermal barrier coatings, Journal of Materials Processing Technology 92-93 (1999) 217-223.
• [6] M. Konter, M. Thumann, Materials and manufacturing of advanced industrial gas turbine components, Journal of Materials Processing Technology 92-117 (2001) 386-390.
• [7] J. Kamalua, P. Byrdb, A. Pitman, Variable angle laser drilling of thermal barrier coated nimonic, J. Kamalua, Journal of Materials Processing Technology 122 (2002) 355-362.
• [8] V. Teixeira, M. Andritschky, W. Fischer, H.P. Buchkremer. D. Stover, Analysis of residual stresses in thermal barrier coatings, Journal of Materials Processing Technology 92-93 (1999) 209-216.
• [9] J.F. Li, H.L. Liao, C.X. Ding, C. Coddet, Optimizing the plasma spray process parameters of yttria stabilized zirconia coatings using a uniform design of experiments, Journal of Materials Processing Technology 160 (2005) 34-42.
• [10] A.K. Ray, Characterization of bond coat in a thermal barrier coated superalloy used in combustor liners of aero engines. Materials Characterization 57 (2006) 199-209.
• [11] W.A. Nelson, R.M. Orenstein, Journal of Thermal Spray Technology 6 (2).
• [12] D. Stover, C. Funke, Directions of the development of thermal barrier coatings in energy applications, Journal of Materials Processing Technology 92-93 (1999) 195-202.
• [13] S.Q. Nusier, G.M. Newaz, Growth of interfacial cracks in a TBC/superalloy system due to oxide volume induced internal pressure and thermal loading, International Journal of Solids and Structures 37 (2000) 2151-2166.
• [14] A.G. Evans, D.R. Mumm, J.W. Hutchinson, G.H. Meier, Pettit F.S., Mechanisms controlling the durability of thermal barrier coatings, Progress in Materials Science 46 (2001) 505-53.
• [15] M. Martena, D. Botto, P. Fino, S. Sabbadini, M.M. Gola, C Badini, Modelling of TBC system failure: Stress distribution as a function of TGO thickness and thermal expansion mismatch, Engineering Failure Analysis 13 (2006) 409-426.