Thermochemical and Thermomechanical study on Composite Coatings (Al 2O 3+ZrO 2•5CaO)

7 Pages Posted: 2 Jan 2020

See all articles by Abhinav

Abhinav

Alliance College of Engineering and Design

N. Krishna Murthy

Vijaya Vittala Institute of Technology

Avinash J Nair

Alliance College of Engineering and Design

Date Written: May 17, 2019

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

Suggested Citation

T, Abhinav and Murthy, N. Krishna and J Nair, Avinash, Thermochemical and Thermomechanical study on Composite Coatings (Al 2O 3+ZrO 2•5CaO) (May 17, 2019). Available at SSRN: https://ssrn.com/abstract=3511933 or http://dx.doi.org/10.2139/ssrn.3511933

Abhinav T (Contact Author)

Alliance College of Engineering and Design ( email )

Chikkahagade Cross, Chandapura - Anekal Main Road,
Bengaluru – 562 106, Karnataka
Bangalore, KS Karnataka 562 106
India

N. Krishna Murthy

Vijaya Vittala Institute of Technology ( email )

Bengaluru
India

Avinash J Nair

Alliance College of Engineering and Design ( email )

Chikkahagade Cross, Chandapura - Anekal Main Road,
Bengaluru – 562 106, Karnataka
Bangalore, KS Karnataka 562 106
India

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
13
Abstract Views
128
PlumX Metrics