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Wear resiatant composite structures

The surface intended to be used in friction parts is subjected to DC process with obtaining deep (up to 2 mm) and narrow (3-100 microns) grooves. After that the part is subjected to traditional chemical and thermal treatment (carburizing, nitriding, carbonitriding, boronizing or other). This allows to obtain a composite structure of friction surface with vertical hard layers. Grooves may be filled with solid lubricants.
wear resistant composite surface
Fig. 1 - Wear resistant and self-lubricating composite structure

wear resistant composite surface
Fig.2 - Variants of steel hardened surfaces

wear resistant composite surface
Fig. 3 - Thickness comparison of the hardened (carbonitriding) layers. Traditional hardening (at the left) and hardening after DC machining (at the right). Same time of carbonitriding.

Examples of the obtained structures

comparision of composite wear resistant coating with traditional hardening
Fig. 4 - Comparative wear resistance of the coatings obtained low-temperature carbonitriding.

Part material steels with hardness less HB 220 (before DC machining )
Coatin thickness, mm up to 1,4
Pitch of vertical hardened layers, mm 0,15-0,8
Surface porosity, % 0-30
Increase the wear and score resistance, times


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