HVOF coating of Diamalloy 2002 powders and Diamalloy 4010 powders as well as two‐layered coatings consisting of these powders is carried out. In the two‐layered structure, Diamalloy 4010 is sprayed at the substrate surface while Diamalloy 2002 is sprayed on the top of Diamalloy 4010 coating. The mechanical properties of the coatings are examined through tensile and three‐point bending tests. The coating microstructure and morphology are examined using the Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and X‐ray diffraction (XRD). It is found that the coating produced is free from defects including voids and cracks. The failure mechanism of coating during tensile and three‐point bending tests is mainly crack formation and propagation in the coating. The elastic modulus of coating produced from Diamalloy 2002 is higher than that of Diamalloy 4010 coating, which is due to the presence of 12% WC in the coating.

Topics
Elastic modulus, Energy dispersive X-ray spectroscopy, Scanning electron microscopy, X-ray diffraction, Crack formation, Educational assessment
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© 2010 American Institute of Physics.
2010
American Institute of Physics
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