Abstract
1. Successive saturation of parts, first with nitrogen or with nitrogen and carbon, and then with oxygen, brings about the formation of a double-layers coating on their surface consisting of chemical compounds. 2. It was established by methods of metallography, electron microprobe analysis, and NGR that oxicarbonitriding causes on the surface the formation of a layer about 2 μm thick, its composition being Fe3O4−Fe2O3. The surface layers of the coating become depleted of nitrogen and have lower hardness thab carbonitrided coatings. 3. The wear resistance of oxicarbonitrided coatings is better than of carbonitrided ones in consequence of the better ability to be run in on account of the oxide film on the surface and the greater ductility of the surface layers. 4. Oxicarbonitrided coatings have better wear resistance than carbonitrided coatings and coatings obtained by hard chromizing and chemical nickelizing. 5. The use of oxicarbonitriding instead of galvanic coating yields better operational characteristics of parts and makes their production cheaper, and in addition it is ecologically more compatible.
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