Kinetic studies of Cr and Al deposition using CVD-FBR on different metallic substrates

Thermochemical calculations for the deposition of aluminium and chromium us ing the metal-subhalide chemistry have been performed by the HSC chemistry software. Before depositing, the flow regimes that lead to a fluidized bed without particle elution have been measured at room and deposition temperat ures. Aluminium diffusion coatings have been obtained on austenitic AISI 30 4 stainless steel and IN-100 Ni-base alloy; the deposition being much faste r on the steel substrates. However, the chromium diffusion coatings are onl y achieved on the IN-100 Ni-base superalloy since in the steel, volatilizat ion of Fe occurs at the first stages of deposition. (C) 1999 Elsevier Scien ce S.A. All rights reserved.