Abrasion resistant mechanical member with composite nickel-plating layer having meshlike porous portion and a method for manufacture thereof

Claim 1

AN ABRASION-RESISTANT MECHANICAL MEMBER WHICH COMPRISES A COMPOSITE NICKEL-ELECTROPLATED LAYER ON THE SURFACE OF SAID MEMBER, SAID LAYER HAVING A MESH-LIKE POROUS PORTION WHICH CONTAINS THEREIN CERAMIC POWDER AS AN ABRASION RESISTANT ELEMENT, SAID POROUS PORTION BEING COMPOSED OF GROOVES OF APPROXIMATELY 0.01 TO 0.5 MM IN WIDTH AND PERCENT AT

Claim 3

A method for manufacturing an abrasion-resistant mechanical member having a composite nickel-electroplated layer on the surface of said member, said layer having a mesh-like porous portion which contains therein ceramic powder as an abrasion resistant element and is cOmposed of grooves of approximately 0.01 to 0.5 mm. in width and present at intervals of approximately 0.5 to 9 mm. thereby to provide an oil retention characteristic, which comprises a step of electrodepositing a workpiece in a nickel-plating bath containing therein a ceramic powder in an amount of 50 to 500 g/lit., said bath further containing a tensile stress accelerating agent in an amount of 0.05 to 5 g/lit. with respect to the total volume of said bath and a compression stress accelerating agent in an amount of 0.1 to 10 g/lit. with respect to the total volume of said bath, the amount of said compression stress accelerating agent being sufficient to permit the action of said tensile stress accelerating agent to overcome the action of said compression stress accelerating agent, thereby to form the nickel-electroplated layer having fine cracks developing in a mesh-like manner and caused by the presence of said tensile stress accelerating agent, and a step of subjecting the resultant member to reverse electrolysis thereby to impart the particular grooves of the particular size to said composite nickel-electroplated layer.

Claim 4

A method for manufacturing an abrasion-resistant mechanical member having a composite nickel-electroplated layer on the surface of said member, said layer having a mesh-like porous portion which contains therein ceramic powder as an abrasion resistant element and is cOmposed of grooves of approximately 0.01 to 0.5 mm. in width and present at intervals of approximately 0.5 to 9 mm. thereby to provide an oil retention characteristic, which comprises a step of electrodepositing a workpiece in a nickel-plating bath containing therein a ceramic powder in an amount of 50 to 500 g/lit., said bath further containing a tensile stress accelerating agent in an amount of 0.05 to 5 g/lit. with respect to the total volume of said bath and a compression stress accelerating agent in an amount of 0.1 to 10 g/lit. with respect to the total volume of said bath, the amount of said compression stress accelerating agent being sufficient to permit the action of said tensile stress accelerating agent to overcome the action of said compression stress accelerating agent, thereby to form the nickel-electroplated layer having fine cracks developing in a mesh-like manner and caused by the presence of said tensile stress accelerating agent, and a step of subjecting the resultant member to reverse electrolysis thereby to impart the particular grooves of the particular size to said composite nickel-electroplated layer.