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2102 |
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Wednesday, May 05, 2010, Hullet Room 11:00 AM Corrosion Protection |
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Assessment of flame sprayed glaze layers as diffusion barriers on refractory materials |
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Olivier Preziosa / SPCTS, France Alain Denoirjean/ SPCTS, France Paule Denoirjean/ SPCTS, France Ghislain Montavon*/ SPCTS, France Thierry Chartier/ SPCTS, France Christian Barthélemy/ Alcan CRV, France Véronique Laurent/ Rio Tinto Alcan, LRF, France Didier Lombard/ Rio Tinto Alcan, LRF, France |
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Large refractory pieces (as the ones used for examples in smelters or incinerators) do not sustain regular glazing in a kiln, mostly due to high associated costs. Still, glass coatings could find use for their physical properties (durability, chemical inertia, permeability, etc.). Thermal spraying, using an oxyacetylenic flame in particular, appears as a solution permitting to circumvent aforementioned disadvantages. This process permits to form a layer acting as diffusion barrier at a relatively high deposition rate on very large surfaces. The airtightness of the coating can represent the main objective depending on the applications. This research has been conducted to evaluate the permeability of such coatings and optimize airtightness. When spraying glazes, the coating formation mechanisms are different from the one encountered with crystallized ceramic materials. Indeed, the high surface tension of those feedstock prevents the particles from being totally spread (i.e., |