Abstract
In aluminum-diffusion coating with Fe-AI powder as diffuser, the powder has marked effects on the characteristics of coating. The present work deals with the studies on (1) packing of Fe-Al powder, (2) its aging, and (3) its fineness, by a laboratory method following after the practical operation.
The results are as follows: (1) If a degree of packing of the powder is in the range of 2.0 -3.0g/cc, little effect is seen on coating properties. (2) When the same powder is used repeating more than 5 times, the diffusion is reduced, and the powders of approximately 60 mesh are decreased. (3) As for fineness rather coarse powder of about 60 mesh is most effective. (4) It is difficult to produce the powder of uniform fineness, hence it is preferable to provide the powder of suitable distribution of fineness in which the amount of 60 mesh powder is maximum.
