Influence Of Substrate Temperature On The Adhesion Property Of YSZ Coatings On Inconel 718 Prepared By EBPVD 

T. Dharini1, P. Kuppusami 1, 2*, A. M. Kamalan Kirubaharan1, R. Ramaseshan3, Arul Maximus Rabel1, S. Dash3

1Centre for Nanoscience and Nanotechnology, Sathyabama University, Chennai 600119, India

2Centre of Excellence for Energy Research, Sathyabama University, Chennai 600119, India

3Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India

Adv. Mater. Lett., 2016, 7 (10), pp 826-830

DOI: 10.5185/amlett.2016.6248

Publication Date (Web): Aug 01, 2016


The present paper reports on the measurement of coating adhesion with Inconel 718 as a function of substrate temperature in order to qualify the coatings for application in nuclear vitrification furnace.  In the present study, the scratch indentation has been used to determine the critical loads and the friction coefficient offered by the coatings as a function of the substrate temperature. It is noticed that as the substrate temperature increases from 673 to 973 K, the critical load also increases from 2.5 N to 6.1 N, while the friction coefficient remains almost constant.  Initially at lower loads, nested micro cracks which form in the coating open in the direction of the scratch track. As the scratch length increases with increasing load, the tensile cracking of YSZ gets transformed to conformal cracking. For the coatings deposited at higher temperature, chipping formation gets reduced as a consequence of improved adhesion of the coating with the substrate. This coating with an improved adhesion finds its application as diffusion barrier coating in nuclear vitrification furnace. This will reduce the faster degradation or premature failure of the components of vitrification furnace made up of Ni based super alloy. The use of YSZ diffusion barrier coating increases the durability and efficiency of the component.


YSZ coating, scratch test, friction coefficient, tensile crack, conformal crack.

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