The Effects of Salt and Carbon Particles on the Erosion and Corrosion Behaviour of Gas Turbine Materials,
NATIONAL GAS TURBINE ESTABLISHMENT FARNBOROUGH (ENGLAND)
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Work was undertaken to assess the erosivity of various graphites, quartz and sea-salt and to determine their role in promoting blade failure. Erosion tests were performed using a whirling-arm rig at room temperature and an air-blast apparatus operating in the range 813K to 873K. A ballistic impact apparatus was also used to implant small particles of graphite and salt in the surface of laboratory testpieces at high temperature. Ingested quartz particles less than 5 micrometers in size may induce erosion damage in the turbine section of small engines. Graphite produced in the combustion chamber and dried sea-salt produce both erosion and subsequent chemical degradation at hot blade surfaces. Carbon particles detected at the base of craters or corrosion warts on blades appear to be responsible for producing this mode of corrosion damage.
- Properties of Metals and Alloys
- Jet and Gas Turbine Engines