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  4. Influence of spray pattern on residual stresses and coating properties of arc-sprayed aluminum bronzes sprayed with different gas mixtures
 
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2018
Conference Paper
Title

Influence of spray pattern on residual stresses and coating properties of arc-sprayed aluminum bronzes sprayed with different gas mixtures

Abstract
Previous own works showed the negative effects of air as pressurizing gas regarding the cavitation erosion resistance of arc-sprayed aluminum bronze coatings due to oxidation and tensile residual stresses. Furthermore, coatings sprayed with a mixture of nitrogen and hydrogen revealed superior coating qualities. A meander-shaped spray pattern was used in the aforementioned studies. However, other publications reveal, that a spiral-shaped spray pattern positively influences heat transfer during the spray process and thus also coating properties. Hence, the alloys CuAl9Ni5Fe4Mn and CuMn13Al8Fe3Ni2 were arc-sprayed with a spiral-shaped pattern in this work, using both pressurized air and a mixture of nitrogen and hydrogen. Process temperatures were recorded by thermographic imaging and residual stresses were measured by modified hole-drilling method using ESPI. Moreover, analyses of the cavitation erosion behavior and other properties were carried out. The results of this study are compared to the corresponding previous works with a meander-shaped spray pattern.
Author(s)
Hauer, M.
Banaschik, R.
Kroemmer, W.
Henkel, K.-M.
Mainwork
ITSC 2018, International Thermal Spray Conference and Exposition. Conference proceedings  
Conference
International Thermal Spray Conference and Exposition (ITSC) 2018  
Language
English
Fraunhofer-Institut für Großstrukturen in der Produktionstechnik IGP  
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