369128 Synthesis and Characterization of Novel Ni-B-Y2O3 Composite Coatings

Monday, November 17, 2014: 4:45 PM
International 9 (Marriott Marquis Atlanta)
Ramazan Kahraman1, Rana A. Shakoor1, Umesh Waware1, Yuxin Wang2 and Wei Gao2, (1)Chemical Engineering, Qatar University, Doha, Qatar, (2)Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand

Ni-B coatings have decent properties such as high hardness, wear resistance and promising anti-corrosion properties which make them suitable for automotive, aerospace, petrochemical, textile and electronics industries. Despite these promising properties, further improvement in their properties is essential so that more challenging requirements and new developments can be fully addressed. Taking a note of the above contemplation, novel Ni-B-Y2O3 composite coatings were synthesized through electrodeposition process. In the present study, a comparison of structural, thermal and mechanical properties of Ni-B and Ni-B-Y2O3 composite coatings is presented to elucidate the useful role of Y2O3 addition to Ni-B matrix. XRD analysis confirms the amorphous nature of Ni-B coatings in their as deposited state. However, there is considerable improvement in crystallinity by the addition of Y2O3 particles into Ni-B matrix. SEM analysis demonstrates the formation of uniform and fine-grained deposits in both coatings. However, AFM studies disclose that addition of insoluble Y2O3 into Ni-B matrix increases the surface roughness. Finally, it is also noticed that mechanical properties (hardness and modulus of elasticity) of Ni-B matrix can be significantly improved by incorporation of insoluble, hard ceramic particles (Y2O3) which make them attractive for many applications. This improvement in mechanical properties of Ni-B matrix can be attributed to the strong dispersion hardening effect of Y2O3 hard particles which hinders the movement of dislocations.

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See more of this Session: Characterization of Composites
See more of this Group/Topical: Materials Engineering and Sciences Division