Startseite Effect of substrate surface preparation on cold sprayed Al-Zn-Al2O3 composite coating properties
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Effect of substrate surface preparation on cold sprayed Al-Zn-Al2O3 composite coating properties

  • Ayça Demirer Kahraman , Fatih Kahraman und Osman Çulha
Veröffentlicht/Copyright: 27. Juli 2019
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Abstract

In this study, a powder mixture containing Al-Zn and Al2O3 particles on AA6083 aluminum alloy was coated by the cold spray method. In order to investigate the effect of the substrate surface properties on the composite coating structure obtained by the cold spray process, the substrate surface was prepared by grit blasting and shot peening. It was found that Al and Zn particles in the coatings of all samples flattened near the substrate surface regions due to the deformation effect. But, Zn particles, because of their low hardness in contrast to the shot peened surface fragmented near the material surface regions through the impact. Similarly, the size of the Al2O3 particles decreased incrementally from the coated surface to the substrate. Particularly in the shot peened samples, the size of the Al2O3 particles decreased by striking the hard substrate surface and fracturing more. Moreover, the amount of Al2O3 particles in the substrate surface of all samples was lower as the particles rebounded. It was also found that pore formation in the coating layer of all samples was very limited. Pore formation in the shot peened samples was by contrast lower than in the grit blasted samples. In addition, a very low oxide layer was found between the particles in the upper region of both the grit blasted and shot peened samples' coating layer.


Correspondence Address, Assoc. Prof. Dr. Fatih Kahraman, Mechanical Engineering Department, Dokuz Eylul University, Engineering Faculty, Tinaztepe Campus, 35160 Buca – Izmir, Turkey, E-mail:

Ayça Demirer Kahraman, born in 1983, graduated from Afyon Kocatepe University, Afyonkarahisar; Turkey in 2005 in the field of Ceramic Engineering. She is a PhD student in Mechanical Engineering at Manisa Celal Bayar University and has been researching on surface coating, welding, plastic deformation and wear resistance of materials.

Assoc. Prof. Dr. Fatih Kahraman, born in 1979, is Associate Professor in the Mechanical Engineering Department at Dokuz Eylul University, Izmir, Turkey. He graduated from Pamukkale University, Denizli; Turkey in 1998 with a degree in Mechanical Engineering. He completed his Master of Science in Mechanical Engineering at Dokuz Eylul University in 2001. In 2008, he also completed his PhD at that university. His main research fields are material processing, welding, plastic deformation, casting and surface engineering.

Assoc. Prof. Dr. Osman Çulha, born 1979, works as a lecturer at Manisa Celal Bayar University, Manisa, Turkey. He graduated from Dokuz Eylul University in 2004 with a degree in Metallurgical and Material Engineering. He completed his Master of Science in Metallurgical and Material Engineering at that university in 2007. In 2011, he completed his PhD also at Dokuz Eylul University. His main research fields are mechanical metallurgy, plastic deformation, steels and their production methods, heat treatment, simulation applications in materials science.


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Published Online: 2019-07-27
Published in Print: 2019-08-01

© 2019, Carl Hanser Verlag, München

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