JPH1018016A - Wear resistant member and treatment of surface thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To harden dispersed plating, to eliminate the need of executing grinding operation on the surface of the dispersed plating and to reduce the operating process by forming dispersed plating film applied with hardening under heating, thereafter applying thermal spraying and forming wear resistant coating film on the dispersed plating. SOLUTION: Abradable coating film 3 as wear resistant coating film is formed on dispersed plating coating film 2 formed on a piston ring 1 by plasma spraying. The abradable coating film 3 is the sprayed coating film closely adhering to the plating coating film 2, having hardness less than that of the dispersed plating coating film 2 and composed of resin, graphite and metal. The dispersed plating coating film 2 is heated by a thermal spraying material at the time of the plasma spraying. In this way, the dispersed plating coating film 2 is thermally hardened by heat in the plasma spraying, thus, there is no need of executing heating treatment as in the conventional manner, and heating treatment can be obviated. Since the abradable coating film 3 enters the recessed part of the surface of the dispersed plating coating film 2, even if the coating 3 is abraded, the surface roughness of the ring 1 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear-resistant member such as a cylinder and a piston ring, and a method for treating the surface thereof.

[0002]

2. Description of the Related Art A sliding member that reciprocates linearly, such as a piston of an automobile engine, has Ni-P-SiC on the inner wall of a cylinder or a piston ring in order to improve the wear resistance of the sliding portion. Plating such as TiN and PV such as TiN
Surface treatment with a D (Physical vapor deposition) film is performed. Among these, in addition to the usual dispersion plating operation, after the dispersion plating is adhered, the member to be plated is subjected to a heat treatment at about 350 ° C. for one hour in order to increase the hardness of the plating. Further, in order to eliminate the roughness of the plating surface of the member to be plated, it is necessary to polish the sliding portion of the member to be plated.

[0003]

In the process of manufacturing a member having a sliding portion as described above, the sliding portion such as the inner wall of a cylinder or a piston ring is subjected to a dispersion plating process to provide wear resistance. Later, heat treatment and polishing work steps are required. In addition, since the dispersion plating film is hard, the partner material may be damaged in the initial operation of the engine.

[0004] The present invention has been made in view of the above-mentioned problems, and is intended to reduce the number of work steps after the dispersion plating treatment, and to prevent a member having a sliding portion from damaging a counterpart especially in an early operation of an engine or the like. An object of the present invention is to provide a wearable member and a surface treatment method thereof.

[0005]

The above object is achieved by the present invention.
According to the invention described in the above, after the surface of the wear-resistant member provided with the sliding surface is subjected to dispersion plating having heat curing to form a plating film, at least a coating material having a hardness smaller than the dispersion plating film is formed. This is achieved by a surface treatment method for a wear-resistant member, characterized in that a wear-resistant film made of the above-mentioned coating material is formed on the dispersion plating by spraying on a non-heated dispersion plating film. According to the second aspect of the present invention, in a wear-resistant member having a pair of sliding surfaces, a dispersion plating film is attached to at least one of the pair of sliding surfaces, and the dispersion plating film is dispersed. This is achieved by a wear-resistant member characterized in that an abradable film having a hardness lower than that of dispersion plating is adhered on a plating film.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wear-resistant member and a surface treatment method thereof according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a piston ring 1 which is a wear-resistant member that slides on the inner wall of a cylinder. The periphery of the piston ring 1 has just been subjected to dispersion plating, and has not been subjected to the heat treatment of the dispersion plating film 2 or the polishing treatment of the plating film surface. Therefore, the surface of the dispersion plating film 2 is rough and has fine irregularities. In the present embodiment, Ni-P-SiC is used as the dispersion plating solution, but other types of plating solutions can be used as long as they have heat-curing properties.

FIG. 2 shows a state in which an abradable film 3 as an abradable film is formed on a dispersion plating film 2 formed on a piston ring 1 by plasma spraying. The abradable film 3 adheres to the plating film, has a lower hardness than at least the dispersed plating film 2, and refers to a thermal sprayed film made of resin, graphite, and metal. Specific components of the abradable film 3 are Al-Si-polyester,
Al-Si-polyimide, Al graphite, Ni-graphite and the like can be used. When these are plasma-sprayed, a resin or the like is dispersed in a metal matrix. As a coating material of the abrasion coating, besides the abradable coating, Al, an Al alloy, and other relatively soft metal spray coatings can be used.

The dispersed plating film 2 is heated by the sprayed material at the time of plasma spraying. Thereby, since the dispersed plating film 2 is thermally cured by the heat of plasma spraying, it is not necessary to perform the heat treatment as in the related art, and the heat treatment can be skipped.

[0010] As shown in FIG.
Is infiltrated into the concave surface of the dispersion plating 2 and is excellent in initial adaptation because it is soft. As shown in FIG. 3, when the piston ring 1 is disposed together with the piston in the cylinder 4 to drive the engine and make a reciprocating linear motion as indicated by an arrow a, the piston ring 1 can be operated without polishing. At the initial stage, the unnecessary abradable film 3 is scraped off and disappears. Moreover, since the abradable film 3 enters the concave portions of the surface of the dispersion plating film 2, even if the abradable film 3 is scraped and the surface of the dispersion plating 2 is exposed,
The surface roughness of the piston ring 1 becomes very small, and the aggressiveness of the mating material on the cylinder 4 surface becomes extremely low.

[0011]

Next, a description will be given of a wear-resistant member and a surface treatment method according to an embodiment of the present invention. In addition, a test piece (AC4C) was used as a base material, and a plating and a thermal spray coating were prepared as described below to obtain a sample.

According to the flow chart shown in FIG. 4, the surface of the base material was pre-plated, and then Ni-P-SiC dispersed plating was performed. The plating bath may be an ordinary nickel sulfamate-based bath composition, and its plating composition and plating conditions are as follows. (1) Nickel sulfamate: 535 ml / l Nickel chloride: 15 g / l Boric acid: 45 g / l Saccharin soda: 3.2 g / l Hypophosphorous acid: 1.5 g / l SiC: 10 to 100 g / l (2) Plating Conditions Primary current density: 5 A / dm ² Secondary current density: 20 A / dm ² Temperature: 55-60 ° C. pH: 4.5

As a result of the plating operation, a dispersion plating film of about 150 μm was formed on the surface of the test piece. Next, an Al-graphite film was formed on the dispersion plating by plasma spraying, and a sample obtained by cutting the test piece was used as a sample of an example. As a comparative example, a test piece having only a dispersion plating film formed on the test piece was used. did. Hereinafter, the results of measuring the hardness and the coefficient of friction of the examples and comparative examples are shown. (1) Hardness test Hardness is a value measured by Vickers hardness. Example: Hmv 780 Comparative Example: Hmv 620-630 (2) Friction test The friction coefficient was measured with a pin-on-disk type friction and wear tester. The test conditions were a load of 200 N and a friction speed of 2.74.
m / s, lubricating oil 10w-40, lubricating oil temperature 130 ° C. Example: 0.08 Comparative Example: 0.13

From the above results, it can be seen that the hardness of the dispersed plating film was increased and the friction coefficient was decreased by forming the abradable film on the dispersion plating. Therefore, it becomes extremely excellent as a wear-resistant member used for the sliding portion.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, according to the above embodiment, the piston ring has been described as a wear-resistant member. However, the present invention is not limited to a sliding member such as a piston ring, but may be a member such as an inner wall of a cylinder. A similar effect can be obtained by forming an abradable film on the dispersed plating film on the side to be slid. That is, when there is a sliding surface, the abrasion film of the present invention can be used for any one of the sliding member and the sliding member, or only one of them.

In the above embodiment, the wear-resistant member reciprocates linearly like a piston ring. However, the wear-resistant member which rotates like a rotating shaft also has a rotating shaft side and a bearing side. Can also be used for the sliding surface.

[0018]

As described above, according to the first aspect of the present invention, there is provided a method for forming an abrasion film on a dispersion plating by spraying after forming a dispersion plating film having heat curing. Since the dispersion plating is employed, the dispersion plating film can be cured without heat treatment of the dispersion plating. Also,
There is no need to perform a polishing work on the dispersed plating surface, and the number of working steps can be reduced. Therefore, the wear-resistant member can be manufactured at low cost, and the manufacturing time can be shortened. According to the invention described in claim 2, the dispersion plating film adheres to the sliding surface of the wear-resistant member and enters the concave portion of the dispersion plating film surface, so that the wear film is scraped and the surface roughness is reduced. It becomes very small, the aggressiveness to the counterpart material is extremely low, and the familiarity of the wear-resistant member at the beginning of operation is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state where a surface of a piston ring which is a wear-resistant member according to an embodiment of the present invention is subjected to dispersion plating.

FIG. 2 is a side sectional view showing a state in which an abradable film is formed on the surface of the piston ring on which dispersion plating is performed.

FIG. 3 is a side sectional view showing a state after sliding the piston ring.

FIG. 4 is a flowchart for explaining pretreatment conditions for dispersion plating in an example of the present invention.

[Explanation of symbols]

 Reference Signs List 1 piston ring 2 dispersion plating film 3 abradable film 4 cylinder

Claims (2)

[Claims] 1. A surface of a wear-resistant member provided with a sliding surface,
After forming a plating film by performing dispersion plating having heat curing, a coating material having a hardness smaller than at least the dispersion plating film is sprayed onto a non-heated dispersion plating film, and an abrasion coating composed of the above coating material is formed. A method for treating a surface of a wear-resistant member, wherein the surface treatment is performed on dispersion plating. 2. A wear-resistant member having a pair of sliding surfaces, wherein a dispersion plating film is attached to at least one of the pair of sliding surfaces, and on the dispersion plating film,
A wear-resistant member having a wear-resistant film having a hardness lower than that of dispersion plating.