Effect of Sulfur in JP-5 Fuel on Hot Corrosion of Turbine Blade Materials in Marine Environment.
Final rept. 2 Apr 69-15 May 70
PHILLIPS PETROLEUM CO BARTLESVILLE OK RESEARCH AND DEVELOPMENT DEPT
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JP-5 fuels containing 0.040 and 0.0004 weight per cent sulfur were tested to evaluate their effect on the durability of turbine-blade materials. Specimens of 13 different superalloys and 20 different superalloy-coating systems were exposed in the Phillips Turbine Simulator. It was operated at 15 atmospheres pressure with gas temperature and velocity at the test specimens cycled from 1000-2000 F and 163-275 ftsec by control of fuel flow to simulate conditions in the hot-section of an engine. Sea salt was added to the inlet air at a concentration of 1 ppm to simulate aircraft operation in a marine environment. Chemical analyses of surface scale removed from test specimens following exposure showed the amount of soluble sodium and sulfate to be proportional to the amount of sulfur in the test fuel. All available evidence indicates that the molecular species responsible for these ions is sodium sulfate. The effect of a reduction from 0.040 to 0.0004 weight per cent sulfur in fuel on the weight lost by test specimens varied with the composition of superalloys and coatings. Also, it varied with the duration of their exposure to the corrosive environment. However, in every case where a statistically significant effect was found, reducing fuel sulfur decreased specimen weight-loss. In general, bare and coated nickel-base superalloys were affected by the reduction in fuel sulfur, but the bare and coated cobalt-base superalloys were not. Author
- Properties of Metals and Alloys
- Jet and Gas Turbine Engines