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| Abstract No.: |
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Scheduled at:
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Thursday, May 22, 2014, Hall A 3:00 PM
Plasma Spraying 2
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| Title: |
Morphology and structure modification of ceramic coatings induced by excimer laser radiation
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| Authors: |
Ahmed Ibrahim* / Farmingdale State College, USA
Hanadi Salem / American University in Cairo, Egypt
Christopher Berndt/ Swinburne University of Technology, Australia
Kamal Shahrabi/ Farmingdale State College, Egypt
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| Abstract: |
The effect of excimer laser annealing on the structure and morphology of ceramic coatings were investigated. Alumina-10% zirconia (AZ-10) coatings were sprayed with a plasma spray gun. The coated surface was treated by excimer laser having a wavelength of 248 nm and pulse duration of 24 ns. The surface structure of the treated coating was examined by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). A detailed parametric study was performed to investigate the effects of different parameters such as laser energy density (fluence), pulse repetition rate (PRR), and number of pulses on the mechanical properties, surface morphology, and microstructure of the coatings. Nanoindentation studies were carried out for measuring the Young's modulus and hardness of the laser treated. The results of this investigation indicated that laser energy and pulse repetition rate have a significant effects on surface morphology, porosity, and microstructure of the coating. the nanoindentation study indicated that the laser treated layer consists of fine homogenous and isotropic coating
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