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Surface Morphology of Laser Modified Yttria Stabilized Zirconia (YSZ) Thermal Barrier Coating

S. N., Aqida and Mohamed Reza Zalani, Mohamed Suffian and Mohd Toff, Mohd Radzi and Brabazon, D. (2014) Surface Morphology of Laser Modified Yttria Stabilized Zirconia (YSZ) Thermal Barrier Coating. In: 17th Annual Esaform Conference on Material Forming, 7-9 May 2014 , Dipoli Congress Centre, Espoo, Finland. pp. 1-8..

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This paper presents laser surface modification process of plasma sprayed yttria stabilized zirconia (YSZ) thermal barrier coating (TBC) for enhanced hardness properties and low surface roughness. A 300W JK300HPS Nd: YAG laser was used to process YSZ TBC sample surface. The parameters selected for examination were laser power, pulse repetition frequency (PRF) and residence time. Micrographs of the TBC system were captured using Optical microscope and EVO 15 Scanning Electron Microscope (SEM). Surface roughness was measured using a 2-dimensional surface profilometer. X-ray diffraction analysis (XRD) was conducted to measure phase crystallinity of the laser-modified coating surface. X-ray diffraction patterns were recorded in the 2θ range of 10 to 80° using Bruker D8 Advance system with 0.7Å wavelength from a copper source (~1.5Å). The laser modified surface exhibited higher crystallinity compared to the as-sprayed samples. The presence of tetragonal phase was detected in the as-sprayed and laser processed samples. These findings are significant to enhance surface properties of semi-solid forming die and prolong the die lifecycle.

Item Type: Conference or Workshop Item (Speech)
Uncontrolled Keywords: Phase transformation; Laser surface modification; Yttria Stabilized Zirconia (YSZ); Thermal barrier coating (TBC)
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Noorul Farina Arifin
Date Deposited: 02 Jul 2014 05:11
Last Modified: 22 Jan 2018 07:47
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