Properties of Yttria-Stabilized-Zirconia Based Ceramic Composite Abradable Coatings

Abstract:

Abradable coatings are used in gas turbines to reduce the clearance between rotating and stationary parts, thereby improve the efficiency and reduce the oil consumption. Besides, the abradable coatings also have to prevent the alloy blade from wearing out. Common used abradable coatings have a diphase structure with hard, strong matrix and soft, self-lubricant phase. In this work, yttria-stabilized-zirconia was used as matrix, and layer-structured LaPO₄ or Ti₃SiC₂ was lubricant phase. The samples were prepared by both pressureless sintering and SPS. The regularity of the mechanical properties, such as hardness and modulus, influenced by the lubricant content were studied. And the abradability was also measured by SRV high temperature friction tester.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1551-1554
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1551
• Online since: June 2012
• Authors: Meng Zhao, Li Xia Zhang, Wei Pan
• Keywords: Abradable Coating, Friction, Lubricant Phase, Mechanical Property

References

[1] H.I. Faraoun: Improvement of thermally sprayed abradable coating by microstructure control, Surface & Coatings Technology 201 (2006) 2303.

DOI: 10.1016/j.surfcoat.2006.03.047

[2] R.E. Johnston: Freestanding abradable coating manufacture and tensile test development, Surface & Coatings Technology 202 (2007) 725.

DOI: 10.1016/j.surfcoat.2007.05.082

[3] E.R. Novinski: The design thermal sprayed abradable seal coatings for gas turbine engines . Presented at Proceedings of 4th National Thermal Spray Conference (USA, 1991).

DOI: 10.4271/890929

[4] T.OKa: Basic characteristic of different abradable coating. Presented at Proceedings of Internal Spraying Conference (Germany, 1990).

[5] K. Watanabe: Modernization and Upgrade Programs for Mitsubishi Heavy-duty Gas Turbines. Presented at Proceedings of the International Gas Turbine Congress (Tokyo, Japan, 2003).

[6] M.Bounazef: 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, Materials Letters 58 (2004) 3375.

DOI: 10.1016/j.matlet.2004.02.049

[7] X. Ma: Investigation of abradable seal coating performance using scratch testing, Surface & Coatings Technology, 202 (2007) 1214.

DOI: 10.1016/j.surfcoat.2007.07.076

[8] H.I. Faraoun: Modelling route for abradable coatings, Surface & Coatings Technology, 200 (2006) 6578.

DOI: 10.1016/j.surfcoat.2005.11.105

[9] R.E. Johnston: Mechanical characterisation of AlSi-hBN, NiCrAl-Bentonite, and NiCrAl- Bentonite-hBN freestanding abradablecoatings, Surface & Coatings Technology, 205 (2011) 3268.

DOI: 10.1016/j.surfcoat.2010.11.044

[10] J. X. Deng: Friction and wear behaviors of the carbide tools embedded with solid lubricants in sliding wear tests and in dry cutting processes, Wear, 270 (2011) 666.

DOI: 10.1016/j.wear.2011.01.031