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| Abstract No.: |
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Scheduled at:
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Wednesday, May 04, 2022, Hall D 11:30 AM
Aviation Industry I
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| Title: |
Deposition and characterization of silicon coatings by HVOF spraying
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| Authors: |
Lidong Zhao* / RWTH Aachen University, Germany
Kirsten Bobzin / ,
Wolfgang Wietheger/ RWTH Aachen University, Germany
Elisa Burbaum/ ,
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| Abstract: |
Silicon coatings have been developed for applications in electronics as well as for environmental barrier coatings by thermal spraying. Until now, silicon coatings have been produced almost exclusively by atmospheric plasma spraying and vacuum plasma spraying. HVOF spraying is widely used to produce dense metallic and carbide-based coatings due to its high particle velocities and moderate particle temperatures. However, there have been no scientific reports on HVOF sprayed silicon coatings in the literature. This study was conducted to investigate the feasibility of fabricating silicon coatings by HVOF spraying using a DJ2600 spray system. The spray parameters were varied to analyze their influence on the coating deposition and coating structure. The coating surfaces were investigated using a confocal laser scanning microscope and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS). The coating structures were examined on their cross sections with SEM. In addition, the hardness and indentation moduli of the silicon coatings were determined. The results showed that the stand-off distance was the key factor influencing the coating deposition. By varying the process parameters, very low amounts of oxide inclusions, dense systems with a porosity of p < 5% and microhardness of HV0,1 ? 700 could be obtained. This demonstrates that the production of promising silicon coatings is feasible by HVOF spraying.
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