| Popis: |
Dispersive rare earth oxide in MCrAlY alloy, compared with elemental rare earth additions, can be more effective in increasing the alloy's resistance to oxidation and hot corrosion. In order to make the alloy-oxide composite coating, experiments on sputter deposition were conducted using D.C. magnetron sputtering devices with the targets specially made for cosputtering of both alloy and oxide. The deposited coatings were analyzed by TEM, XPS, XFS and EMPA methods. The TEM shows that there are very fine (520nm) dispersive particles in the annealed composite coating, which inhibit the grain coarsening in annealing. The XPS shows that there is measurable Yz?% or SiO, in the composite coating, and the EMPA shows a homogeneous Y distribution along the cross section of the coating. The results show that a sputter deposited oxide dispersed alloy coating has been developed. |
