Abstract
In this analysis, functional properties of zirconia toughened alumina (ZTA) are improved by doping 1.5 wt. % copper oxide (CuO). The powders of composites are prepared through co-precipitation process followed by hot isostatic pressing for densification. After densification, developed composites are mirror polished to evaluate the functional properties. The results of investigation shows a decrement in hardness ( ̴ 5%) and bulk density ( ̴ 7%), respectively, whereas, an improvement of 1% is observed for fracture toughness. A significant improvement of ̴ 20% in coefficient of friction is also observed. The decrement in mechanical properties is attributed to the existence of CuO at the grain boundary that acts as an ionic copper, creates impurities phases. But, the presence of ionic copper at the grain boundary encourages the crack bridging phenomenon responsible for the improvement in fracture toughens. A remarkable reduction in the functional properties is observed due to formation of complex compound, i.e. CuAl2O4 during densification. The formed complex compound has low shear strength and easily deformable, resulting in the formation of thin film between two sliding surfaces. The formation of patchy layer at the interface is main basis for the improvement in COF.
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The authors thanks to Dr. Rishi ashthana (Director GITM Lucknow) for his kind permission to publish this article.
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Singh, B.K., Yaduvanshi, A.A., Mishra, A.K. (2022). Comparative Study of CuO/ZTA and ZTA Composites in Terms of Functional Properties. In: Mukherjee, K., Layek, R.K., De, D. (eds) Tailored Functional Materials. Springer Proceedings in Materials, vol 15. Springer, Singapore. https://doi.org/10.1007/978-981-19-2572-6_28
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