Laser treatment of plasma-sprayed ZrSiO4 coatings
| Autor: | N. Branland, D. Plessis, B. Minot, F. Guillet, S. Schelz |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Annealing (metallurgy) Analytical chemistry Atmospheric-pressure plasma Surfaces and Interfaces General Chemistry Plasma Condensed Matter Physics Thermal expansion Surfaces Coatings and Films Thermal conductivity Chemical engineering Plasma torch Materials Chemistry Cubic zirconia Thermal spraying |
| Zdroj: | Surface and Coatings Technology. 200:6384-6388 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2005.11.062 |
| Popis: | Self-supported zircon (ZrSiO 4 ) coatings have been deposited by means of atmospheric pressure plasma spraying, a high rate deposition method. Zircon is one of the technologically important oxide ceramic material known for its refractoriness, its low thermal expansion and low thermal conductivity. However, it is well known that ZrSiO 4 dissociates into ZrO 2 and SiO 2 in the high temperature plasma torch during plasma spraying, the rapid quenching preventing reverse combination of both components into ZrSiO 4 . Usually, high temperature annealing (about 1500 °C) is applied in order to combine SiO 2 and ZrO 2 into ZrSiO 4 . In this contribution, we investigate an attractive technological alternative to recombine SiO 2 and ZrO 2 into ZrSiO 4 by laser treatment with a scanning continuous wave CO 2 laser. We also investigate the addition of SiO 2 rich glassy particles to the plasma spray powders in order to facilitate the recombination of ZrO 2 and SiO 2 into ZrSiO 4 during laser treatment. By carefully adjusting the CO 2 laser treatment parameters (laser power density, scanning speed) we show that the SiO 2 and ZrO 2 phases indeed recombine into ZrSiO 4 . It appears in this contribution that the addition of low melting point SiO 2 rich particles strongly benefits the reaction of zirconia and silica into zircon. |
| Databáze: | OpenAIRE |
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