| Abstract: | Metal dusting of nickel and Ni-base alloys occurs by inward and internal growth of graphite in the metal phase, leading to extrusion and ejection of metal particles, which catalyze carbon deposition, i.e. coking. Compared to metal dusting of iron and steels which occurs via intermediate carbide formation and leads to much finer metal particles, coking on the Ni-base alloys is much less. This is caused by the larger size and smaller amount of metal particles formed by metal dusting and also by the clearly smaller rates of metal wastage on Ni-base alloys. |
