Thermochemical and Thermomechanical Study on Composite Coatings (Al2O3+ZrO2·5CaO)
Abhinav1, N. Krishnamurthy2, Avinash J Nair3, Harishkumar Kustagi4
1Abhinav, M.Tech, Ph.D Research Scholar, Assistant Professor, Affiliation Alliance College of Engineering and Design, Alliance University, Bangalore (Karnataka), India.
2Dr. N. Krishnamurthy, Professor and Head, Department of Mechanical Engineering, Affiliation Vijaya Vittala Institute of Technology, Bengaluru (Karnataka), India.
3Avinash J Nair, B.Tech, Department of Mechanical Engineering, Affiliation Alliance College of Engineering and Design, Anekal (Karnataka), India.
4Harishkumar Kustagi, B.Tech, Department of Mechanical Engineering, Affiliation Alliance College of Engineering and Design, Anekal (Karnataka), India.
Manuscript received on 23 May 2019 | Revised Manuscript received on 13 June 2019 | Manuscript Published on 27 June 2019 | PP: 327-331 | Volume-8 Issue-1C May 2019 | Retrieval Number: A10560581C19/2019©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Premature failure is the major apprehension in graded coating systems. To determine the life span of the topcoat (Al2O3+ZrO2·5CaO), Muffle furnace technique was adopted. The topcoat thicknesses were varied in 100, 200 & 300 µm and applied on Cast iron substrate. A controlled heating (600±2°C) and ambient cooling in the cycle were carried out until the fracture acknowledges at the surface of the topcoat. Results obtained from SEM micrograph and EDX analysis revealed that thermochemical and thermomechanical stresses lead to premature failure of the topcoat. The coating reported failing from the bond coat and the same is remained intact with the substrate. After 312 thermal cyclic tests, spallation acknowledges in the case of 100 µm topcoat. The mechanism of failure for the above said graded composite coating discussed in detail.
Keywords: Al2O3+ZrO2 .5CaO; Muffle Furnace; Thermochemical; Thermomechanical.
Scope of the Article: Composite Materials