Abstract
High temperature gas turbine sealing is an important issue for increasing the thermal efficiency of gas turbine. In this purpose, layered structured LaPO4 has been selected as the soft phase to add into the commercialized thermal barrier coating material 7 wt% yttria stabilized zirconia (7YSZ). The consequent thermal conductivities and mechanical properties versus the content of LaPO4 have been researched systemically in this paper. Phase composition and microstructure of the high-temperature sintered LaPO4/7YSZ composites were characterized. The thermal conductivity decreases significantly due to the second phase effects and the interface thermal resistance was also strongly involved according to the composite model. The hardness decreased by composed LaPO4 phase so that to reduce attrition of the vanes at high temperature. The slight increase of fracture toughness and bending strength in the results were also favored in operation. The experimental results demonstrate that the LaPO4/7YSZ composite will be an excellent candidate abradable sealing material for high temperature gas turbine.
Similar content being viewed by others
References
Saini A, Pollock T (2012) High-temperature materials increase efficiency of gas power plants. MRS Bull 37:550–551
Borel MO, Nicoll AR, Schlapfer HW, Schmid RK (1989) The wear mechanisms occurring in abradable seals of gas-turbines. Surf Coat Technol 39:117–126
DeMasi-Marcin JT, Gupta DK (1994) Protective coatings in the gas turbine engine. Surf Coat Technol 68–69:1–9
Hardwicke CU, Lau YC (2013) Advances in thermal spray coatings for gas turbines and energy generation: a review. J Therm Spray Technol 22:564–576
Donald IW, Mallinson PM, Metcalfe BL, Gerrard LA, Fernie JA (2011) Recent developments in the preparation, characterization and applications of glass-and glass–ceramic-to-metal seals and coatings. J Mater Sci 46:1975–2000. doi:10.1007/s10853-010-5095-y
Bardi U, Giolli C, Scrivani A, Rizzi G, Borgioli F, Fossati A, Partes K, Seefeld T, Sporer D, Refke A (2008) Development and investigation on new composite and ceramic coatings as possible abradable seals. J Therm Spray Technol 17:805–811
Wang HG (1996) Criteria for analysis of abradable coatings. Surf Coat Technol 79:71–75
Ma X, Matthews A (2009) Evaluation of abradable seal coating mechanical properties. Wear 267:1501–1510
Faraoun HI, Grosdidier T, Seichepine JL, Goran D, Aourag H, Coddet C, Zwick J, Hopkins N (2006) Improvement of thermally sprayed abradable coating by microstructure control. Surf Coat Technol 201:2303–2312
Johnston RE (2011) Mechanical characterisation of AlSi–hBN, NiCrAl–Bentonite, and NiCrAl–Bentonite–hBN freestanding abradable coatings. Surf Coat Technol 205:3268–3273
Richardt K, Bobzin K, Sporer D, Schlafer T, Fiala P (2008) Tailor-made coatings for turbine applications using the Triplex Pro 200. J Therm Spray Technol 17:612–616
Novinski E, Harrington J, Klein J (1982) Modified zirconia abradable seal coating for high temperature gas turbine applications. Thin Solid Films 95:255–263
Bounazef M, Guessasma S, Saadi BA (2004) The wear, deterioration and transformation phenomena of abradable coating BN–SiAl-bounding organic element, caused by the friction between the blades and the turbine casing. Mater Lett 58:3375–3380
Matějíček J, Kolman B, Dubský J, Neufuss K, Hopkins N, Zwick J (2006) Alternative methods for determination of composition and porosity in abradable materials. Mater Charact 57:17–29
Cao XQ, Vassen R, Stoever D (2004) Ceramic materials for thermal barrier coatings. J Eur Ceram Soc 24:1–10
Zhao M, Zhang LX, Pan W (2012) Properties of yttria-stabilized-zirconia based ceramic composite abradable coatings. Key Eng Mater 512-515:1551–1554 (High-Performance Ceramics VII, Pts 1 and 2)
Luo YM, Pan W, Li SQ, Wang RG, Li JQ (2003) Fabrication of Al2O3–Ti3SiC2 composites and mechanical properties evaluation. Mater Lett 57:2509–2514
Yi MZ, He JW, Huang BY, Zhou HJ (1999) Friction and wear behavior and abradability of abradable seal coating. Wear 231:47–53
Ma X, Matthews A (2007) Investigation of abradable seal coating performance using scratch testing. Surf Coat Technol 202:1214–1220
Kawakame M, Bressan JD (2006) Study of wear in self-lubricating composites for application in seals of electric motors. J Mater Process Technol 179:74–80
Clegg MA, Mehta MH (1988) NiCrAl/Bentonite thermal spray powder for high-temperature abradable seals. Surf Coat Technol 34:69–77
Du AB, Wan CL, Qu ZX, Pan W (2009) Thermal conductivity of monazite-type REPO4 (RE = La, Ce, Nd, Sm, Eu, Gd). J Am Ceram Soc 92:2687–2692
Hikichi Y, Nomura T (1987) Melting temperatures of monazite and xenotime. J Am Ceram Soc 70:C252–C253
Morgan P, Marshall DB (1995) Ceramic composites of monazite and alumina. J Am Ceram Soc 78:1553–1563
Padture NP, Gell M, Jordan EH (2002) Thermal barrier coatings for gas-turbine engine applications. Science 296:280–284
Min W, Daimon K, Matsubara T, Hikichi Y (2002) Thermal and mechanical properties of sintered machinable LaPO4–ZrO2 composites. Mater Res Bull 37:1107–1115
Davis JB, Marshall DB, Housley RM, Morgan P (1998) Machinable ceramics containing rare-earth phosphates. J Am Ceram Soc 81:2169–2175
Kuo DH, Kriven WM (1998) Fracture of multilayer oxide composites. Mater Sci Eng A 241:241–250
Liang YJ, Che YC, Liu XX, Li NJ (1993) Manual of practical inorganic matter thermodynamics. Northeastern University Press, Shenyang
Schlichting KW, Padture NP, Klemens PG (2001) Thermal conductivity of dense and porous yttria-stabilized zirconia. J Mater Sci 36:3003–3010. doi:10.1023/A:1017970924312
Ma D, Zhang QC (1989) Acoustic measurement of elastic constant for ceramic materials. J Inorg Mater 4:362–367
Lankford J (1982) Indentation microfracture in the palmqvist crack regime—implications for fracture-toughness evaluation by the indentation method. J Mater Sci Lett 1:493–495
Rice RW, Wu CC, Borchelt F (1994) Hardness-grain-size relations in ceramics. J Am Ceram Soc 77:2539–2553
Maxwell-Garnett JC (1904) Colours in metal glasses and in metallic films. Phil Trans R Soc London A 203:385–420
Benvensite Y (1987) Effective thermal conductivity of composites with a thermal contact resistance between the constituents: nondilute case. J Appl Phys 61:2840–2843
Hasselman DPH, Johnson LF (1987) Effective thermal conductivity of composites with interfacial thermal barrier resistance. J Comput Mater 21:508–515
Du AB, Pan W, Ahmad K, Shi SL, Qu ZX, Wan CL (2009) Enhanced mechanical properties of machinable LaPO4/Al2O3 composites by spark plasma sintering. Int J Appl Ceram Technol 6:236–242
Callister WD Jr (1990) Materials science and engineering: an introduction, 2nd edn. Wiley, New York
Tomaszewski H, Węglarz H, Wajler A, Boniecki M, Kalinski D (2007) Multilayer ceramic composites with high failure resistance. J Eur Ceram Soc 27:1373–1377
Acknowledgements
This research was supported by the National Natural Science Foundation of China (No. 51272120).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ren, X., Guo, S., Zhao, M. et al. Thermal conductivity and mechanical properties of YSZ/LaPO4 composites. J Mater Sci 49, 2243–2251 (2014). https://doi.org/10.1007/s10853-013-7919-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-013-7919-z