Many types of turbines, including aircraft gas turbines, steam turbines, and power recovery turbines, suffer from solid particle erosion caused by a variety of materials ingested into the machines. Utilization of various laboratory erosion tests tailored to the specific application by using various erodents, temperatures, velocities, and angles of impact, have been shown to be effective in the development and selection of coatings for the erosion protection of turbine blades and other components. Detonation gun coatings have demonstrated their efficacy in providing substantial protection in many situations. It has now been shown that several tungsten carbide and chromium carbide Super D-Gun™ coatings not only have better erosion resistance than their D-Gun analogs, but cause little or no degradation of the fatigue properties of the blade alloys. Nonetheless, caution should be employed in the application of any laboratory data to a specific situation and additional testing done as warranted by the turbine designer.

Issue Section:
Gas Turbines: Manufacturing and Materials
Topics:
Coatings, Erosion, Turbine blades, Turbines, Aircraft, Alloys, Blades, Explosions, Fatigue properties, Gas turbines, Machinery, Particulate matter, Steam turbines, Temperature, Testing, Tungsten
1.
Tucker, R. C., Jr., and Nitta, H., “Detonation Gun Coatings—Coating Characteristics and Applications,” ATTAC’88, Osaka, Japan, May 1988.
2.
McCloskey, T. H., and Bellanca, C., “Minimizing the Effects of Solid Particle Erosion in Utility Steam Turbines,” in: Solid Particle Erosion of Steam Turbine Components: 1989 Workshop, EPRI GS-6535, 1989.
3.
Wolektarski, W., Proceedings of the 11th Turbomachinery Symposium, Texas A & M University, College Station, TX 1982.
4.
Tucker
R. C.
, and
Nitta
H.
, “
Detonation Gun and Super D-Gun Coating Processes
,”
J. High Temp. Soc. Japan
, Vol.
18
Supplement, p.
204
204
,
1992
.
5.
Cox
L. C.
, “
The Four Point Bend Test as a Tool for Coating Characterization
,”
Surface and Coatings Technology
, Vol.
36
,
1988
, pp.
807
–
815
.
6.
Gill, B. J., and Quets, J. M., “Wear and Fatigue Resistant Coatings From the New Super Detonation Gun Process,” presented at SURFAIR, France, 1992.
7.
Walsh, P. N., “Erosion Resistance of Coatings at Steam Turbine Temperatures,” in: Steam Turbine-Generator Developments for the Power Turbine Industry, ASME PWR-Vol. 18, 1992.
8.
Tabakoff, W., and Wakeman, T., “Test Facility for Material Erosion at High Temperature,” ASTM Special Publication 664, 1979, p. 129.
9.
ASTM G76-83, “Practice for Conducting Erosion Tests by Solid Particle Impingement Using Gas Jets.”
10.
Wlodek, S. T., 1987, “Erosion Resistant Coatings for Steam Turbines,” EPRI CS-5415, Electric Power Research Institute, Palo Alto, CA.
This content is only available via PDF.
Copyright © 1995
 by The American Society of Mechanical Engineers
You do not currently have access to this content.