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Embrlttlement In the Thermal Power Statlon Rotor Turns. The findings of the analysis are reported for copper turns of a rotor. A discussion is given to the reasons of embrittlement of these copper turns around the holes for gaseous cooling. Local concentrations are irrvestigated for hydrogen, oxygen, sulfur, phosphorus and iron in the embrilement areas. The observed intergranular failure of copper is found to resuk from the formation of brittle chemical.com pounds in the polluted hydrogen environment of a thermal power station.
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## R41 Wcrkstoffc und Korrosion 43, (1992) includes a reservoir for the test substance whose bone formation promoting properties are to be tested. The reservoir is connected to the bone tissue ingrowth channel through a capillary aperture. so-called diffusion capillary, for supply of the test subs