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Poster De Conférence Année : 2000

High temperature oxidation and corrosion by molten glass of refractory elements-base, Ni-base and Co-base alloys

Jean Di Martino
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  • IdRef : 070477787
Christophe Rapin
Pierre Steinmetz
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  • PersonId : 1255517
  • IdRef : 070477876
Patrice Berthod

Résumé

Many industrial applications require high-performance materials with good mechanical properties and high resistance to oxidation/corrosion at high temperatures. This is especially true in the glass industry, where metallic or ceramic materials suffer from high temperature oxidation and corrosion by molten glass at temperatures near 1000°C and sometimes much more. In the first case, conventional alloys belonging to cast nickel-base and cobalt-base families may be successfully used according to their sufficient mechanical properties. The major problem is the oxidation/corrosion phenomenon, the speed of which is both related to the characteristics of alloys and to those of the processes. To improve the resistance of these alloys it is essential to know the role of both alloy chemical composition and microstructure, and the one of the real process conditions. For higher temperatures, conventional alloys also meet mechanical deformation which become drastic if temperature reaches 1200°C or more. To solve this double problem of oxidation/corrosion and creep resistance, development of refractory alloys based on tungsten and/or molybdenum could be judicious. Oxidation resistance of these metals being very bad, they have to be alloyed with elements which form stoichiometric, protective oxide layers. Like for the conventional alloys, chromium has been chosen for this purpose, since chromia has a low solubility in most glasses. Many conventional cast alloys as nickel-base and cobalt-base are candidate as materials of tools for molten glass working at medium temperatures. As it has been evidenced, the rates of both oxidation and corrosion by molten glass are related to the chemical composition and/or microstructure of the alloys (base element, kind and density of interdendritic carbides). It appears that an optimum could be found to minimize these phenomena, that are the most important for this temperature level. For higher working temperature, creep deformation can appear. It leads to select more refractory materials like CrMoW alloys. These ones have been obtained by a powder metallurgy way involving palladium as sintering agent, then investigated over a wide range of composition. Excellent oxidation behaviours are observed for alloys with a high chromium and tungsten contents. A comparison of the calculated parabolic rates constant for the alumina and chromia alloys shows that such chromia forming alloys can have an oxidation resistance similar to that of alumina forming alloys at high temperatures.
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hal-04104273 , version 1 (23-05-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : hal-04104273 , version 1

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Sebastien Diliberto, Jean Di Martino, Christophe Rapin, Pierre Steinmetz, Patrice Berthod. High temperature oxidation and corrosion by molten glass of refractory elements-base, Ni-base and Co-base alloys. Gordon Research Conference on "High Temperature Materials, Processes And Diagnostics", Jul 2000, Plymouth, United States. ⟨hal-04104273⟩
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