ISSUE 2/2010

/// 05
Ma, D.; Zhou, B.; Bührig-Polaczek, A.
Investigation of a heat conductor technique to produce single crystal turbine blades of medium size

The heat conductor (HC) technique was applied to produce dummy turbine blades of medium size. Because of their excellent thermal physical properties, graphite and SiC were selected as the HC material. Thermal measurements showed that both the graphite and the SiC HCs achieved a significant reduction in undercooling at platform extremities. It was possible to reduce the average undercooling by approx. 19 K. Metallographic investigations revealed a remarkable reduction in stray grain formation, providing clear evidence of the effectiveness of the HC technique for improving the quality of single crystal components.




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