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Oxidation behaviors and microstructural alterations of a Mo(Si,Al)(2)-based composite after heating at 1580 degrees C either in a furnace (ex-situ) or via alternating current (in-situ)

Kristina Hellström (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; P. Persson ; E. Strom
Journal of the European Ceramic Society (0955-2219). Vol. 35 (2015), 2, p. 513-523.
[Artikel, refereegranskad vetenskaplig]

The commercial heating element Kanthal Super ER (Mo(Si,Al)(2)-based composite) was oxidized at 1580 degrees C for 24 h up to 1 year using two methods: (1) a furnace set at the desired temperature, (2) passing an alternating current (AC) through the material. Initially, the oxidation behaviors appeared similar for the AC- and furnace-exposed materials. However, at longer exposure times, the level of Al depletion was more pronounced in the furnace-exposed material. A dense alumina scale formed with the same thickness during the two types of exposures, although a porous outer alumina scale was also formed on the composite that was heated in the furnace. The bulk microstructures were also different, in that dark regions in a circle were noted on the AC-exposed material, while the dark regions were evenly distributed on the furnace-exposed material. These dark regions consisted of agglomerated Mo-5(Si,Al)(3) and Al2O3. The AC-exposed material also has "bands" where Al2O3 have agglomerated.

Nyckelord: Mo(Si,Al)(2); Oxidation; Microstructure; Furnace; Alternating current



Denna post skapades 2014-12-22. Senast ändrad 2015-02-11.
CPL Pubid: 208870

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Keramteknik

Chalmers infrastruktur