PURPOSE: To form a nitride layer easily as well as to improve the extent of abrasion resistance by constituting a vane, whose tip part is made elastically contact with a roller eccentrically rotating in a cylinder, in having a nitriding applied to steel or sintered alloy containing a specified quantity of C, Cr, and Mo, V both or one side, respectively.
CONSTITUTION: A vane is made up of having a nitriding applied to steel or sintered alloy containing both of C: 0.5-1.6%, Cr: 1.5-10% and Mo: 0.2-1.2%, V: 0.2-1.2% or either side in terms of wt.%. A first layer 9 is formed in a surface layer part at the vane tip and a second layer 10 is formed in the lower part, and this first layer is of a compound layer using Fe-Cr-N, made up of having N acted on Fe, Cr of base material, as a chief ingredient, and it is of top high hardness, little in a friction factor and excellent in abrasion resistance. The second layer 10 uses Cr of a base metal 6 as a base material whereby a diffuse reaction of N is developed, and it is of structure that a third compound 11 is reticulated and molybdenum carbide of a first compound is dotted around. With this constitution, excellent abrasion resistance, less in wear in a roller or the like, is brought into full play.
KAWAI HIDEKI
NISHIHARA HIDETOSHI
OZAKA MASAHIKO
