Title: Flexural characteristics of D-gun sprayed functionally graded alumina and alumina-zirconia ceramic composites coatings

Authors: Sundaram Rajakumar, L. Vijayaraghavan, M.M. Mayuram, R. Krishnamurthy

Addresses: Mechanical Engineering Department, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600 036, India. ' Mechanical Engineering Department, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600 036, India. ' Mechanical Engineering Department, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600 036, India. ' Mechanical Engineering Department, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600 036, India

Abstract: Detonation gun (D-gun) sprayed alumina and alumina-zirconia ceramic composite are evaluated as monolayered and functionally graded coatings (FGC). The coated specimens are subjected to three-point bending test to assess their flexural response. From the load deformation characteristic of the ceramic deposits, while alumina as a monolayer (ALM) exhibit high modulus of rupture (MOR). Alumina-zirconia FGC (AZG2) has better flexure properties. Structure property relationship and response of acoustic emission from flexure specimen supplement this observation.

Keywords: detonation gun; D-gun coating; functionally graded coating; FGC; flexural characterisation; XRD; acoustic emission; alumina; zirconia; ceramic composites; coatings; three-point bending; load deformation; modulus of rupture; thermal spraying.

DOI: 10.1504/IJMATEI.2010.035165

International Journal of Materials Engineering Innovation, 2010 Vol.1 No.3/4, pp.398 - 416

Published online: 10 Sep 2010 *

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