Development of Functionally Graded Coating by Thermal Spray Deposition

Development of Functionally Graded Coating by Thermal Spray Deposition

Jyotsna Dutta Majumdar, Indranil Manna
Copyright: © 2015 |Pages: 42
DOI: 10.4018/978-1-4666-7489-9.ch005
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Functionally Gradient Coatings (FGCs) are emerging materials with an improved service life and have a promising future for the production of (a) tailored components for applications subjected to large thermal gradients, (b) smart coating with improved corrosion and wear resistance, (c) improved fatigue wear, and (d) improved material structures for energy applications like batteries, fuel cells, etc. FGCs may be developed by physical/chemical vapor deposition, electro/electroless deposition, thermal spray deposition technique, etc. Thermal spraying refers to the technique or a group of techniques whereby molten or semi-molten droplets of materials are sprayed onto a solid substrate to develop the coating. In this chapter, detailed overviews of the development of functionally graded coating by thermal spray deposition techniques are presented. In addition, a few research results on the development of functionally graded coating for tribological and thermal barrier applications are presented.
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History Of Functionally Graded Coatings

The concept of compositional and microstructural gradient in material microstructure was presented by Bever (Bever & Duwez, 1972) who studied various gradient composites, and reviewed their potential applications. The induction of gradation of polymeric materials by the variation of the chemical nature of the monomers, the molecular constitution of the polymers and the supra-molecular structure or morphology of the polymers was introduced by Shen (Shen & Bever, 1972). The effective chemical, mechanical, biomedical and transport properties were studied and possible applications, including gasoline tank and damping materials, were considered. However, the design, fabrication and evaluation of this gradient structure were not studied.

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