Synthesis of mullite-based coatings from alumina and zircon powder mixtures by plasma spraying and laser remelting

Hazra, S.; Das, J.; Bandyopadhyay, P.P.

doi:10.1016/j.matchemphys.2015.01.038

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…Mullite has been detected in the X-ray diffraction of the coating produced. A similar observation has been made by Hazra et al [6].…”

Section: Introductionsupporting

confidence: 89%

“…Microstructure of the as-sprayed and laser treated coating Fig. 1(a) is the secondary electron image of the cross section of assprayed coating [6]. Three layers, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…Hazra et al [6] discussed the microstructural characteristics of assprayed and laser treated zircon alumina powder mixture in a previously published report. The as-sprayed coating had a lamellar structure common to the thermally sprayed coatings.…”

Section: Introductionmentioning

confidence: 99%

“…This aspect has not yet been reported in any literature. In fact although it has been established by a number of researchers that it is possible to synthesize mullite by plasma spraying a mixture of zircon and alumina [4][5][6][7][8], no report is yet available showing the quantity of mullite produced in wt%.…”

Section: Introductionmentioning

confidence: 99%

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The effect of parametric variation on the mullite content of plasma sprayed zircon-alumina powder mixture

Hazra

Bandyopadhyay

2016

Surface and Coatings Technology

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“…Mullite has been detected in the X-ray diffraction of the coating produced. A similar observation has been made by Hazra et al [6].…”

Section: Introductionsupporting

confidence: 89%

“…Microstructure of the as-sprayed and laser treated coating Fig. 1(a) is the secondary electron image of the cross section of assprayed coating [6]. Three layers, i.e.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of parametric variation on the mullite content of plasma sprayed zircon-alumina powder mixture

Hazra

Bandyopadhyay

2016

Surface and Coatings Technology

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“…Because of the uneven and irregular shape of arc-prayed Al particles when arriving at the Al coating surface, they lead to the poor continuity of the layered structure and incomplete overlapping among the Al particles and, as a result, voids are formed between the layered structures. When the semi-melted and unmelted particles reach the substrate, they cannot fill the voids and consequently form pores, which eventually expand and connect to the cracks [15,16]. The seawater can easily penetrate into the substrate through the defects, which reduce its corrosion resistance [10] and limit its application scope and service life.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

Chen

Dejun

2018

Coatings

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An arc-sprayed amorphous Al-Ti-Ni coating on S355 structural steel was processed by laser remelting (LR) at powers of 600, 800, and 1000 W. The surface-cross-sectional morphologies, chemical element distributions, and phase compositions of the as-obtained Al-Ti-Ni coatings were analyzed using a scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), and X-ray diffractometer (XRD), respectively. The immersion corrosion tests of Al-Ti-Ni coatings in 3.5% NaCl solution for 720 h were performed to investigate the effects of LR power on their immersion corrosion behaviors. The test results show that the amorphous Al-Ti-Ni coatings form good metallurgical bonding with the substrate after LR. The AlNi, Al 3 Ti, Al 3 Ni 2 , Ti 3 O 5 , and Al 2 O 3 amorphous phases are detected in the Al-Ti-Ni coatings after LR. The corrosion potentials of Al-Ti-Ni coatings after LR show a positive shift relative to that of S355 steel, implying that the corrosion resistance of Al-Ti-Ni coatings was superior to that of S355 steel. A dense protective Al 2 O 3 film is formed on the Al-Ti-Ni coating surface at an LR power of 1000 W, at which power the highest corrosion potential of −0.233 V is observed. The corrosion mechanisms of Al-Ti-Ni coating at the LR power of 1000 W are uniform corrosion and pitting corrosion, while those of Al-Ti-Ni coatings at the LR powers of 600 and 800 W are localized corrosion and pitting corrosion. The corrosion resistance of Al-Ti-Ni coating with the LR power of 1000 W is better than those at the LR powers of 600 and 800 W, effectively improving the corrosion resistance of S355 steel.

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Study of the effects of the laser remelting process on the microstructure and properties of the WC–10Co–4Cr coating sprayed by HVOF

Panziera

Oliveira

Pereira

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The laser remelting technique is considered a promising and effective method for improving the surface of thermally sprayed coatings, eliminating microstructural defects such as pores and cracks, increasing the life of parts and equipment by increasing microhardness and increasing anchoring force between coating and substrate. In the present work, tungsten carbide alloy (WC-12Co-4Cr) coatings were deposited on properly prepared SAE 1016 substrates using the high velocity oxy-fuel technique. An ytterbium fiber laser was used to remelt the surface of the coating by accurately varying the scanning speed and laser beam power to achieve a pore and crack-free coating and better metallurgical anchorage to the substrate through the optimization of the studied parameters. The samples were characterized by scanning electron microscopy and microhardness. The results show that it is possible to obtain higher hardness coatings after the laser remelting process, free of pores or pronounced imperfections and metallurgically bonded to the substrate. We also found a processing range for the ytterbium laser remelting of the WC-12Co-4Cr coating aiming at high productivity and microstructural optimization of the coating for different thicknesses.

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Synthesis of mullite-based coatings from alumina and zircon powder mixtures by plasma spraying and laser remelting

Cited by 12 publications

References 28 publications

The effect of parametric variation on the mullite content of plasma sprayed zircon-alumina powder mixture

The effect of parametric variation on the mullite content of plasma sprayed zircon-alumina powder mixture

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

Study of the effects of the laser remelting process on the microstructure and properties of the WC–10Co–4Cr coating sprayed by HVOF

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