Effect of processing parameters on the laser glazing of plasma-sprayed alumina–titania ceramic

Sreedhar, C.; Santhanakrishnan, G.; Gokularathnam, C. V.; Krishnamurthy, R.

doi:10.1016/s0924-0136(01)00682-3

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…Laser glazing as an advanced processing technique has been used to modify TBCs surface. Research has shown that laser glazing can decrease the surface roughness and eliminate the porosity to densify the coatings, which are desired properties of TBCs ( Ref 5,6). Laser glazing is a promising process for improving the thermal shock resistance of the TBCs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Microstructure and Thermal Shock Resistance of Laser Glazed Nanostructured Zirconia TBCs

et al. 2010

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Nanostructured zirconia thermal barrier coatings (TBCs) have been prepared by atmospheric plasma spraying using the reconstituted nanosized yttria partially stabilized zirconia powder. Field emission scanning electron microscope was applied to examine the microstructure of the resulting TBCs. The results showed that the TBCs exhibited a unique, complex structure including nonmelted or partially melted nanosized particles and columnar grains. A CO 2 continuous wave laser beam has been applied to laser glaze the nanostructured zirconia TBCs. The effect of laser energy density on the microstructure and thermal shock resistance of the as-glazed coatings has been systematically investigated. SEM observation indicated that the microstructure of the as-glazed coatings was very different from the microstructure of the as-sprayed nanostructured TBCs. It changed from single columnar grain to a combination of columnar grains in the fracture surface and equiaxed grains on the surface with increasing laser energy density. Thermal shock resistance tests have showed that laser glazing can double the lifetime of TBCs. The failure of the as-glazed coatings was mainly due to the thermal stress caused by the thermal expansion coefficient mismatch between the ceramic coat and metallic substrate.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Microstructure and Thermal Shock Resistance of Laser Glazed Nanostructured Zirconia TBCs

et al. 2010

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“…The development of advanced ceramic coatings for high-performance Ti alloys is one of the most challenging tasks in modern engineering, however the laser deposition process has produced promising results proving it to be suitable technique for surface modification (Travitzky et al, 2014). Satisfactory glazing of a ceramic composite with minimum cracking was obtained by Sreedhar et al (2001) using a solid state pulsed laser (Sreedhar, Santhanakrishnan, Gokularathnam, & Krishnamurthy, 2001). Years later, Tian et al (2005) concluded that despite evidence of imperfections such as cracks and porosity, surface improvement using laser treatment is still a viable technique for titanium alloys (Tian et al, 2005).…”

Section: Ceramic Coatings For Titanium Alloysmentioning

confidence: 99%

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Duke¹

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“…Laser Cladding is another surface treatment method that can deposit thick layers of hard materials with good adhesion to the substrate [6]. However, when laser cladding ceramic there are common defects which are caused by the instability of the ceramic melt and the high viscosity.…”

Section: Introductionmentioning

confidence: 99%

UQ eSpace

Hrstich¹

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In this study, the laser cladding process was utilised to deposit a thick ceramic layer of TiO2 onto a Ti6Al4V metal alloy substrate to improve the wear properties at the surface. A custom made powder was compared to a commercially available powder and testing was completed at high scan speeds with increasing laser powers. The results showed that Marangoni convection occurs in the clad melt which will affect the properties of the surface treatment. The custom powder was found to have a less consistent track formation than the commercially available powder, but its track dimensions were much more suitable for producing a full surface layer. The custom powder was found to have less defects such as cracking, porosity and delamination compared to the commercially available powder. Increasing the laser scan speed increased the height and width of the clad track, while lowering the contact angle. However this did slightly increase the number of defects within the clad layer.

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Effect of processing parameters on the laser glazing of plasma-sprayed alumina–titania ceramic

Cited by 12 publications

References 2 publications

Analysis of the Microstructure and Thermal Shock Resistance of Laser Glazed Nanostructured Zirconia TBCs

Analysis of the Microstructure and Thermal Shock Resistance of Laser Glazed Nanostructured Zirconia TBCs

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