On the kinetics of the pack—aluminization Process

摘要: An investigation has been made of the aluminization unalloyed Ni in fluoride-activated packs varying Al activity. In low activity, which ratio to was less than 50 at. pct, specimen surface quickly came equilibrium with pack and remained close for duration normal coating runs. these kinetics controlled by diffusion solid. higher activity did not come process governed a combination solid gas rates. Under most conditions however, composition time-invariant steady-state appeared exist at pack-coating interface. By combining Levine Caves’ model gaseous pure-Al calculations rates some success achieved explaining results.