Piston ring having nitriding layer and composite Ni-B plating la

Details Piston ring having nitriding layer and composite Ni-B plating la Piston ring having nitriding layer and composite Ni-B plating la

1991-03-13

1992-04-14

Look, Edward K.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277DIG6, B65D 5300

Patent

active

051041324

ABSTRACT:
A piston ring for use in an internal combustion engine. The piston ring includes a base body, a nitriding layer formed at an outer peripheral surface portion of the base body, and a composite Ni-B diffusion plating layer formed over the nitriding layer. The composite Ni-B diffusion plating layer has a thickness ranging from 0.5 to 20 micron meters. Since the nitriding layer is provided on at least the sliding surface of the piston ring, high durability of the piston ring can be attained because of the high wear resistivity of the nitriding layer. Further, since a Ni-Bi composite dispersion plating layer is formed over the nitriding layer, abnormal wearing due to scuffing is avoidable at an initial working phase because of the high scuffing resistance of the composite plating layer.

REFERENCES:
patent: 4077637 (1978-03-01), Hyde et al.
patent: 4079720 (1978-03-01), Takahashi
patent: 4359230 (1982-11-01), Bruni
patent: 4570946 (1986-02-01), Tsuchiya et al.
patent: 4579355 (1986-04-01), Kooroki
patent: 4681817 (1987-07-01), Shiwada
patent: 4941669 (1990-07-01), Fujisawa et al.

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