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An account j-s given of three techniques that are currently under development for the deposition of overlay-type coatings suitable for protecting superalloy turbine blades and vanes in service engines. These are (i) a combination of plasma spraying with subsequent chemical vapour deposition of aluminium or other elements, (ii) sputter ion plating, and (iii) occluded electroplating. Results are presented and discussed of various laboratory tests and high velocity corrosion rig tests carried out on superalloy components and test pieces coated by these techniques.

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