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4770 |
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Wednesday, May 11, 2016, Yellow River Hall 10:20 AM Automotive Industry |
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Investigation of amorphous iron based thermal barrier coatings |
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Tim Königstein* / RWTH Aachen University, Germay Kirsten Bobzin / Chair of Surface Engineering, Germany Mehmet Öte/ Chair of Surface Engineering, Germany Thomas Frederic Linke/ Chair of Surface Engineering, Germany |
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Because of their favorable thermo-physical properties, good machinability and low material costs, coatings, which exhibit a highly amorphous microstructure, are currently in the focus of research. Especially their low thermal conductivities make them attractive as coatings for components in combustion engines. Considering the recrystallization temperature of the material, iron based coatings might serve as a new generation of thermal barrier coatings (TBCs) for low temperature systems, reducing thermal losses. The objective of this research project is the development of highly amorphous, iron based coatings. For the manufacture of the coatings amorphous feedstock materials were developed and characterized regarding their morphologies, phase compositions and recrystallization temperatures. The coatings were deposited by air-plasma-spraying and high-velocity-oxygen-fuel-spraying with different parameter sets. Thereby the materials ability of keeping an amorphous structure during spraying was investigated. In addition, particle velocities and temperatures were measured and compared to the recrystallization temperatures of the feedstock materials. Subsequently, the thermal diffusivity values were determined for selected parameter sets using free standing coatings, which confirm the potential of iron based TBCs. |