JPS63206479A - Sliding member - Google Patents

Abstract

PURPOSE:To improve wear resistance and self-lubricity by subjecting sliding parts to a Co surface treatment contg. phosphorus at a specific ratio or below. CONSTITUTION:At least one sliding surface of the sliding member is subjected to the surface treatment essentially consisting of Co contg. <=10wt.% P. The wear resistance of the sliding parts is thereby improved and the reliability of the sliding part is improved even under high load and high speed conditions. The similar effect is obtd. even if the Co surface treatment is executed only on one stationary side of the sliding member or both or the other thereof. The base material of this surface treatment is usable for treatment of metals such as iron and Al as well in addition to cast iron. Since the surface treatment has the self-lubricity, the treatment is particularly effective for the sliding parts with which oiling conditions are disadvantageous as oil lubrication is hindered by a refrigerant as in the case of a refrigerant compressor.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is directed to a scroll compressor "rotary compressor/greaser".
The present invention relates to a sliding member applied to sliding mechanical parts such as the following.

BACKGROUND OF THE INVENTION In recent years, sliding mechanical parts have become subject to stricter sliding conditions such as speed and load, and various surface treatments have been applied to them.

For example, in refrigerant compressors, phosphorous manganese treatment (
Rubrite treatment (hereinafter referred to as lubrite treatment), nickel plating treatment, alumite treatment, etc. are applied to sliding parts such as flank shafts and connecting rods to improve the wear resistance of these sliding parts.

Problems to be Solved by the Invention However, the above-mentioned sliding members do not have sufficient wear resistance and it is difficult to fully guarantee the reliability of sliding parts under severe sliding conditions. It had some problems.

In view of the above-mentioned problems, the present invention provides a sliding surface treatment with excellent wear resistance and self-lubricating properties.

Means for Solving the Problems In order to solve the above-mentioned problems, the surface treatment of the sliding member of the present invention is to form cobalt containing 10 wt % or less of phosphorus into the product.

Operation The present invention, with the above-described configuration, has excellent wear resistance even under high load and high speed conditions, thereby fully guaranteeing the reliability of the sliding parts.

EXAMPLE Hereinafter, a sliding member according to an example of the present invention will be explained with reference to the table.

The table shows the results of an abrasion resistance test using an abrasion tester on a fixed piece of a sliding member whose surface was treated with cobalt as a main component.

(1) Test conditions: Roller-bin type abrasion tester (-r) Shape of test piece (1) Fixed piece: Width: 12m1. Thickness 12M, height IBjs.

(11) Rotating piece...Outer diameter 33jlll, width 12
m1゜One side of the fixed piece on the outer periphery of the rotating piece (12X 12mm
) is applied a constant load and the rotating piece is rotated.

(b) Sliding conditions (:) Speed: 3 m/sec (11) Load: 1 oof (line contact with a width of 12 squares) (iii) Time: 30 minutes (lv) Temperature...Room temperature (20"C) (ψlubrication
...Liquified Freon 113 (c) Test material The surface roughness of all sliding surfaces was Rmax 1 μm.

(1) Fixed piece (a) The base material is cast iron (Fe12), and the surface treatment is as follows:
It was electroless plated to a thickness of 16 μm with a composition of 4 wt % phosphorus and 96 wt % cobalt, and was also heat treated at 300″C for 1 hour.

(b) The base material is cast iron (Fe12), and the surface is treated with Leuprite treatment to a thickness of 2 μm.

(C) The base material is cast iron (Fe12), and the surface treatment is 8wt% phosphorus and 92wtO/, t7 nickel.
) Electroless plating treatment with a thickness of 16 μm consisting of the following composition:

(d) The base material is aluminum alloy casting (AC8C),
Alumite treatment with a thickness of 16 μm was performed as surface treatment.

(11) Rotating piece (sliding surface shown) (4) Base material is cast iron (Fe12) without surface treatment.

(b) The base material is aluminum alloy casting (ACsC) composited with nickel-based foam metal.

(2) Test results...The values in the table are the wear depth of the fixed piece (0 m) As is clear from the table, when the sliding counterpart material is untreated cast iron, the Leuprite treatment of Conventional Example 1 In comparison with the nickel-phosphorus treatment of Conventional Example 2 and the alumite treatment of Conventional Example 3, the cobalt-phosphorus treatment of the present invention showed excellent wear resistance, ranging from a wear amount of % to %. Furthermore, when the sliding material is an aluminum alloy casting composited with nickel foam metal, the nickel-phosphorus treatment of Conventional Example 2 caused galling and significant wear. In contrast, the cobalt-phosphorus treatment of the present invention resulted in extremely stable and good wear.

As described above, according to this embodiment, the cobalt-based surface treatment of the fixed piece of the sliding member can have excellent wear resistance by containing 10 wt % or less of phosphorus.

In addition, in this example, the phosphorus composition ratio of the cobalt-based surface treatment was 4 wt%, but as shown in Figure 1, if the phosphorus composition ratio is 10 wt% or less, there is no significant decrease in hardness. A cobalt-based electroless W plating film is generated to ensure wear resistance.

In addition, in this example, the heat treatment conditions were 300
``C x 1 hour, film hardness was Hv 620;
If the phosphorus composition ratio is 10 wt% or less, heat treatment Hv50
If it is 0 or more, wear resistance is guaranteed.

Further, in this example, the base material for cobalt surface treatment was cast iron, but other metals such as iron and aluminum can also be treated.

Moreover, since this surface treatment has self-lubricating properties, it is particularly effective for sliding parts, such as refrigerant compressors, where oil lubrication is hindered by refrigerant and therefore lubrication conditions are disadvantageous.

Effects of the Invention As described above, the present invention improves the wear resistance of the sliding parts by applying a cobalt-based surface treatment containing 10 wt% or less of phosphorus to the sliding parts, and improves the wear resistance of the sliding parts. Reliability can be improved.

In this example, the cobalt-based surface treatment was applied only to one side of the fixation, or the same effect could be obtained by applying the cobalt surface treatment to both sides or by using another force.

[Brief explanation of the drawing]

Figure 1 is a correlation diagram between the phosphorus composition weight ratio in the film and surface hardness of the cobalt-based surface treatment of the present invention, and Figure 2 is a correlation diagram of the heat treatment temperature and surface hardness of the cobalt-based surface treatment of the present invention. .

Claims (3)

[Claims] (1) A sliding member in which at least one sliding surface is surface-treated with cobalt as the main component and phosphorus in an amount of 10 wt% or less. (2) The temperature of the sliding surface containing cobalt-phosphorus is 200℃.
Heat treatment is performed for more than 30 minutes, and the hardness is reduced to HV.
Claim 1 characterized in that the number is 500 or more.
Sliding member described in section. (3) The sliding member according to claim 1, wherein the sliding surface that does not contain cobalt-phosphorus is formed of a nickel-based metal or a nickel-based surface treatment.