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Additional resources for High temperature surface engineering : proceedings of the Sixth International Conference in the series "Engineering the surface", 23-25 September 1997, Edinburgh Conference Centre, Edinburgh, UK
An analogous trend has been noted in previous studies concerning other vapour aluminising processes-r" involving inert carrier gas flow, reduced coating chamber pressure and reduced and pulsed chamber pressure. Figure 6 shows the nature of the surface of the vapour aluminide coatings formed on the Inconel 738 samples in the present work, as determined by scanning electron microscopy. Whilst there appears to be no material variation in the intrinsic surface structure of the coatings in going from position A, through B to C, there does seem to be a diminution in surface roughness.
Several of the characteristics of the vapour aluminide coatings formed on the Inconel 738 samples in the present work display no substantive change with increasing sample distance from the source powder mixture and hence, by implication, increasing length along a turbine blade/vane cooling channel. Some others, chiefly total coating thickness and outer coating zone aluminium content, do exhibit reckonable variation, in both cited cases an attenuation. This does not, however, exceed tolerable limits.
Figure 10 illustrates that for instance at the end of a set of columnar grains scale growth occurred by the formation of equiaxed small grains. It can be seen that not all of the new grains were in direct contact with the preceding columnar grains (Note: the scale was growing inwards). In this way particularly midsize- pores were created which were frequently found at grain boundary triple points. Concentrations of midsize-pores together with micropores and clusters of small grains composed the macropores.