Reaction-bonded Si3N4 turbine shrouds were examined after failure during engine testing. Test times ranged from 2 to 50 h and maximum turbine inlet temperatures were ungefaehr gleich 900 C. Failures were attributed to excessive mechanical stresses caused by rig problems and to thermal shock. Most of the fractures initiated at surfaces, apparently from machining damage. Strengths of bend specimens machined from engine-tested shrouds equaled that of material from untested billets. Estimates of component fracture stresses agreed with values from bend tests of specimens with as-received surfaces.
Analysis of fracture of reaction-bonded Si3N4 turbine shrouds
Analyse des Bruchs von Turbinengehaeusen aus reaktionsgesintertem Siliciumnitrid
1981
17 Seiten
Aufsatz (Konferenz)
Englisch
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