Effect of CaF2 on interfacial phenomena of high alumina refractories with Al alloy

cited authors

  • Koshy, P; Gupta, S; Sahajwalla, V; Edwards, P

fiu authors

abstract

  • An experimental study was conducted to investigate the interfacial phenomena between Al-alloy and industrial grade high alumina refractories containing varying contents of CaF2 at 1250 °C. Interfacial reaction products and phases formed in the heat-treated refractory samples were characterized using electron probe microanalysis (EPMA) and X-ray diffraction (XRD), respectively, while interfacial phenomena including dynamic wetting behavior were analyzed using the sessile drop technique. Refractories containing less than 5 wt pct CaF2 showed good resistance to reactions with the molten alloy, due to the dominance of corundum, and the presence of anorthite at the interface. However, with a further increase in the additive content, a glassy matrix of anorthite with CaF2 was formed. Formation of this phase significantly increased the intensity of reactions resulting in the buildup of an interfacial layer. The study thus revealed the strong catalytic effect of CaF2 on reactions of high alumina refractories with Al-alloy. © 2008 The Minerals, Metals & Materials Society and ASM International.

publication date

  • August 1, 2008

Digital Object Identifier (DOI)

start page

  • 603

end page

  • 612

volume

  • 39

issue

  • 4