Laser remelting of plasma-sprayed yttria partially stabilized zirconia coatings |
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| Authors: | J H Ouyang Xiaodong Li |
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| Affiliation: | (1) Fraunhofer Institute for Material and Beam Technology, D-01277 Dresden, Germany;(2) School of Materials Science and Engineering, Harbin Institute of Technology, 150001 Harbin, People’s Republic of China;(3) School of Materials Science and Engineering, Harbin Institute of Technology, China |
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| Abstract: | A plasma-sprayed 8 wt.% yttria partially stabilized zirconia coating doped with 3 wt.% SiO2 was remelted by laser. The microstructure of the as-sprayed and laser-remelted coatings was characterized by scanning electron
microscopy (SEM), electron probe microanalysis (EPMA), transmission electron microscopy (TEM), and x-ray diffraction (XRD).
The effect of laser remelting on the hardness, wear resistance, and thermal shock resistance of the coatings was also studied.
The laser-remelted coating consists of fine solidification grains without the presence of pores and cracks. The elements are
uniformly distributed in the laser-remelted coating. Nontransformable tetragonal (t′) phase is predominant in the laser-remelted coating with a small amount of cubic phase. Laser remelting greatly enhanced
the hardness, wear resistance, and thermal shock resistance of the coatings, and should find more applications. |
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| Keywords: | laser remelting mechanical properties microstructure plasma-sprayed yttria partially stabilized zirconia coatings |
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