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Experimental Investigation on Mechanical and Surface Properties of Cr3-C2 Composite coating Using Atomic Force Microscope

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Author(s): P.S. HANUMANTA RAO | CH.SRINIVASARAO | G. DIWAKAR

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 2;
Issue: 8;
Start page: 6656;
Date: 2011;
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Keywords: Tungsten Carbide composite coatings | AFM | surface topography | mechanical properties and nanoscratching and indentation.

ABSTRACT
Chromium Carbide composite coating has been the subject of interest in the area of nano material due to the improvement in mechanical properties when grain sizes reduce to nanometer scale.. Composite coating of chromium carbide has used in integrated printed circuit boards (PCBs), pins for dot-printers, corrosion resistance and other wear resistant parts. The present work to determine the mechanical properties Young’s modulus and hardness, surface properties surface roughness, surface topology. An Atomic Force Microscope (AFM) equipped with a SiN cantilever is used to scratch the surface of Cr3-C2 (75-25%) coating deposited on an Aluminium substrate by a process called Nano scratching. During nanoscratching the sample is scratched and indented through few nanometers depth. The sample has been prepared by the detonation gun spray process. The property of the coated sample is measured in contact mode by AFM. The investigation revealed that the addition of Carbide to Cr is not only changing the topology but also the mechanical properties. The averagemeasured values of Young’s modulus and hardness of Cr3-C2 (75-25%) coated sample is in the range of 583.27k Pa and 123.81k Pa.
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