Abstract
In this work, the microstructures of B4C/Ni coatings by cold spray with blends or chemical vapor deposited (CVD) Ni-coated powders were investigated and compared. Powder blends with Ni powder and fine or coarse B4C powders were prepared for various B4C content ranging from 54 to 87 vol.% (equal to 25-65 wt.%). Three CVD Ni-coated B4C powder batches were also synthesized with various B4C content using the fine B4C as core particles. Ni-coated powders and both types of cold sprayed coating microstructures with blends or coated powders were investigated by optical and scanning electron microscopy. Further quantitative image analysis was carried out on scanning electron microscopy (SEM) images to measure the B4C content within the coating regarding the influence of the nominal content in the feedstock for each coating type. Both types exhibited fine fragments and unfragmented B4C, but coatings with CVD-coated powders had many more unfragmented particles. Moreover, the higher levels for both B4C (44.0 ± 4.1 vol.%) and coating microhardness (429 ± 41 HV0.5) were obtained in case of the CVD-coated powders. However, it was assessed that the highest microhardness was not obtained for the highest B4C content. This questionable result is discussed with regard to the fully original composite microstructure obtained from CVD Ni-coated B4C powder.
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Acknowledgments
This work was initiated through the collaborative Liaison Program of the “Cold Spray Club” (mat.ensmp.fr/clubcoldspray).The authors would like to thank Mr. F. Borit from MINES ParisTech for cold spraying experiments.
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This article is an invited paper selected from presentations at the 2011 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2011: Proceedings of the International Thermal Spray Conference, Hamburg, Germany, September 27-29, 2011, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and André McDonald, Ed., ASM International, Materials Park, OH, 2011.
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Feng, C., Guipont, V., Jeandin, M. et al. B4C/Ni Composite Coatings Prepared by Cold Spray of Blended or CVD-Coated Powders. J Therm Spray Tech 21, 561–570 (2012). https://doi.org/10.1007/s11666-012-9774-x
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DOI: https://doi.org/10.1007/s11666-012-9774-x