Solid particle erosion (SPE) and liquid droplet erosion (LDE) cause severe damage to turbine components and lead to premature failures, business loss, and repair costs to power plant owners and operators. Under a program funded by the Electric Power Research Institute, TurboMet International and Southwest Research Institute (SRI) have developed hard erosion resistant nanocoatings and have conducted evaluation tests. These coatings are targeted for application in steam and gas turbines to mitigate the adverse effects of SPE and LDE on rotating blades and stationary vanes. Based on a thorough study of the available information, the most promising coatings, such as nanostructured titanium silicon carbonitride (TiSiCN), titanium nitride (TiN), and multilayered nanocoatings, were selected. State-of-the-art nanotechnology coating facilities at SwRI were used to develop the coatings. The plasma enhanced magnetron sputtering method was used to apply these coatings on various substrates. Ti–6Al–4V, 12Cr, 17-4PH, and custom 450 stainless steel substrates were selected based on the current alloys used in gas turbine compressors and steam turbine blades and vanes. Coatings with up to thickness have been deposited on small test coupons. Initial screening tests on coated coupons by solid particle erosion testing indicate that these coatings have excellent erosion resistance by a factor of 20 over the bare substrate. Properties of the coating, such as modulus, hardness, microstructural conditions including the interface, and bond strength, were determined. Tensile and high-cycle fatigue tests on coated and uncoated specimens indicate that the presence of the coatings has no negative effects but has a positive influence on the high-cycle fatigue strength at zero and high mean stresses.
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August 2010
Research Papers
Nanotechnology Coatings for Erosion Protection of Turbine Components
V. P.“Swami” Swaminathan,
V. P.“Swami” Swaminathan
TurboMet International
, San Antonio, TX 78250
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Ronghua Wei,
Ronghua Wei
Southwest Research Institute
, San Antonio, TX 78238
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David W. Gandy
David W. Gandy
Electric Power Research Institute
, Charlotte, NC 28262
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V. P.“Swami” Swaminathan
TurboMet International
, San Antonio, TX 78250
Ronghua Wei
Southwest Research Institute
, San Antonio, TX 78238
David W. Gandy
Electric Power Research Institute
, Charlotte, NC 28262J. Eng. Gas Turbines Power. Aug 2010, 132(8): 082104 (8 pages)
Published Online: May 18, 2010
Article history
Received:
May 17, 2008
Revised:
September 10, 2008
Published:
May 18, 2010
Citation
Swaminathan, V. P., Wei, R., and Gandy, D. W. (May 18, 2010). "Nanotechnology Coatings for Erosion Protection of Turbine Components." ASME. J. Eng. Gas Turbines Power. August 2010; 132(8): 082104. https://doi.org/10.1115/1.3028567
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