KR100559182B1 - Cu-Si-Sn-Pb POWDER FOR COATING LAYERS WITH HIGH LUBRICANT AND HIGH CONDUCTIBILITY AND WEAR RESISTANT - Google Patents

Abstract

The present invention relates to a copper powder having high lubrication, high conductivity, and abrasion resistance, and is composed of Si: 10-30 wt%, Sn: 1-5 wt%, and Pb: 5-15 wt% Cu. Provided are powders for silicon-tin-lead-based coating materials.

According to the present invention, it is expected that the life of a highly conductive component requiring high wear resistance and high lubrication property can be significantly improved because it is possible to manufacture a copper alloy coating material in which hardness, abrasion resistance, and lubrication property are all increased by 1.5 times or more.

Description

Copper-Si-Sn-Pb POWDER FOR COATING LAYERS WITH HIGH LUBRICANT AND HIGH CONDUCTIBILITY AND WEAR RESISTANT}

1 is a schematic view of the cross-sectional structure of the mixed powder coating layer of the present invention.

The present invention relates to a copper powder having high lubrication, high conductivity, and wear resistance, and more particularly, copper powder having Si particles suitable for improving wear resistance and copper having Pb or Sn suitable for improving high lubrication characteristics of low friction. The present invention relates to a powder for copper-silicon-tin-lead-based coating material having high lubricity, high conductivity, and abrasion resistance, which is improved to provide excellent lubricity, conductivity, and wear resistance by coating a mixed powder of powder on a surface of a base material using a flame accelerated at high speed.

In general, the application of copper alloy has a wide range of applications from electrical and electronic parts to various industrial equipment parts due to its high conductivity and high thermal conductivity.

Copper alloys, which combine these advantages, are widely applied as bulk component materials for industrial equipment, but are also widely applied as coating materials to compensate for the disadvantages of the base material.

For example, sleeves and bushes used in continuous production lines for industrial equipment and automobiles, metal sheet materials, and parts used in friction environments under high loads, not simply friction environments between dissimilar materials.

However, in the case of industrial equipment and automotive bearing parts, high toughness and stiffness as well as high wear resistance and thermal conductivity are required due to heat generation due to high-speed frictional repeated loads. Even in the case of toughness and stiffness, high lubricity and thermal conductivity are required, especially for parts used in frictional environments under high loads, not merely frictional environments between dissimilar materials, but with higher thermal conductivity and higher toughness and stiffness, wear resistance and high lubricity. Etc. are required in combination.

In the past, the service life has been extended by increasing the hardness of copper alloy. In that case, if the strength of copper alloy is increased through reinforcing mechanisms such as employment strengthening or precipitation strengthening, the tensile strength increases. In addition, in the case of sleeves and bushes, the service life was extended through application of high-strength, high toughness cast iron, but in this case, the life of the cast iron was reduced due to low thermal and electrical conductivity.

The present invention was created in view of the above-described problems of the prior art, and induces a copper alloy coating layer structure in which Si particles, Pb and Sn are evenly distributed in the microstructure of the copper alloy coating material using a flame accelerated at high speed. It is an object of the present invention to provide a copper powder for a coating material having a high lubricity and high conductivity excellent in wear resistance.

The present invention, in order to achieve the above technical problem, Si: 10 ~ 30wt%, Sn: 1 ~ 5wt%, Pb: 5 ~ 15wt% Cu-silicon-tin-lead system having excellent high lubricating high conductivity wear resistance It is characterized by providing a powder for the coating material.

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Hereinafter, the present invention will be described in detail.

The composition of the powder for use as the coating material of the present invention is Cu-Si-based powder containing 10-30 wt% and Cu-Sn-Pb-based containing 1-5 wt% Sn or 5-15 wt% Pb individually or simultaneously. The powder is mixed.

That is, the Cu-Si-based powder composition is composed of Si: 10 ~ 30wt%, balance Cu; The Cu-Sn-Pb-based powder composition is composed of Sn: 1 to 5 wt%, Pb: 5 to 15 wt%, and balance Cu.

In addition, the coating method of the present invention is to mix the Cu-Si powder structure and the Cu-Sn-Pb powder structure by coating the mixed powder with a thickness of about 50㎛ thin to 50㎛ thick on the base material surface using the accelerated flame It is intended to have a coating layer structure.

Here, the Cu-Si powder structure has a structure in which Si particles of 10 μm or less are evenly distributed, and the Cu-Sn-Pb powder structure has a structure in which Sn or Pb is evenly dispersed in the Cu grains or at the grain boundaries. A highly conductive copper alloy coating layer exhibiting high lubrication can be obtained.

In the present invention, 10-30 wt% of Si-added Cu-Si powder used for improving wear resistance and 1-5 wt% of Sn or 2-10 wt% of Pb used for improving high lubrication characteristics are individually or Cu-Sn-Pb-based powders containing at the same time are produced by conventional gas and moisture aerosol methods.

Then, the mixed powder to be coated with the accelerated high speed flame is prepared by mixing the two kinds of powders in a conventional mixing method.

The mixed powder in which Cu-Si powder containing 10 to 30 wt% of Si and Cu-Sn-Pb powder containing 1 to 5 wt% of Sn or 5 to 15 wt% of Pb separately or simultaneously is mixed. Highly resistant to wear and lubrication, consisting of a Cu-Si powder structure with evenly distributed Si particles of 10 µm or less and a Cu-Sn-Pb powder structure with evenly distributed Sn or Pb in the Cu grain boundary by coating the surface of the base material with an accelerated flame Also copper alloy coating material can be produced.

The copper alloy coating layer exhibits high lubricity and high wear resistance without loss of thermal conductivity because Si particles, Sn and Pb particles are uniformly dispersed throughout the coating structure.

Hereinafter, the reason for numerical limitation with respect to the component content of a coating material is demonstrated.

[Silicone (Si): 10 ~ 30wt%]

Silicon (Si) element is an element characterized in that the wear resistance of the copper alloy is improved by forming a separate Si particles in the matrix of the copper alloy, Si particles formed in the matrix of the powder when less than 10wt% is added to the Cu-Si powder It is not expected to improve abrasion resistance due to the lack of, and when silicon (Si) exceeds 30wt%, the wear resistance is rather reduced due to bridging phenomenon in which Si particles formed in the matrix are connected to each other.

[Sn: 1 ~ 5 wtwt%]

The Sn element added to the Cu-Sn-Pb powder exhibits the characteristics of solid solution in Cu grains. Therefore, when it is 1 wt% or less, it contributes little to the improvement of lubrication characteristics by solid solution. Since it forms an intermetallic compound, it may cause brittleness of the coating material.

[Lead (Pb): 5-15 weight wt%]

The Pb element added to the Cu-Sn-Pb powder exhibits crystallization at Cu grain boundaries. Therefore, when the amount of Pb is less than 5wt%, the area of the crystallized Pb particles is insufficient, which contributes to the improvement of lubricity. May be separated from the Cu grains, resulting in a deterioration of the durability of the part.

Hereinafter, the present invention will be described in more detail with reference to Examples.

EXAMPLE

Cu-15wt% Si, Cu-25wt% Si powder, Cu-2wt% Sn-7wt% Pb, Cu-4wt% Sn-12wt% Pb powder were prepared by gas spraying, and then the powders are shown in Table 1. After mixing in the same combination to make a mixed powder (Inventive material 1 ~ 4) and then coated the mixed powder 0.2mm thickness on the surface of the base material using the accelerated flame respectively 88wt% Cu which is applied as a commercial bearing component material The wear characteristics were evaluated in comparison with -4wt% Pb-4wt% Sn-4wt% Zn and the mixing ratio of each powder was 1: 1.

1 is a schematic view of the cross-sectional structure of the mixed powder coating layer prepared by the above method, when the mixed powder of Cu-Si powder and Cu-Sn-Pb powder is coated on the surface of the base material using an accelerated flame, as shown in FIG. Mixed tissues of heterologous tissues by heterogeneous powder are shown.

Here, the structure formed by the Cu-Si powder is a structure in which Si particles of 5 µm or less are evenly distributed in the Cu matrix, and the Cu-Sn-Pb structure is a structure in which Sn and Pb are uniformly dispersed in and around Cu grains.

Table 1 below shows the wear characteristics, lubrication characteristics and hardness of the commercially available 88wt% Cu-4wt% Pb-4wt% Sn-4wt% Zn alloy after grinding the surface of the mixed powder coating material designed by the present invention. have.

As shown in Table 1, the coating material prepared by the mixed powder of Cu-Si powder and Cu-Sn-Pb powder prepared by the above method was added to the comparative material 88wt% Cu-4wt% Pb-4wt% Sn-4wt% Zn alloy Compared to 1.5 times improved hardness and 1.5 times increased wear resistance and lubrication properties can be seen.

As described above, according to the present invention, it is possible to manufacture a copper alloy coating material in which hardness, abrasion resistance, and lubrication property are all increased by 1.5 times or more, thereby significantly improving the service life of highly conductive parts requiring high wear resistance and high lubrication property. It is expected.

Claims (4)

Si: 10-30 wt%, Sn: 1-5wt%, Pb: 5 to 15 wt% Cu-silicon-tin-lead-based coating powder with excellent lubricity, high conductivity, and high wear resistance. The method according to claim 1, The Sn and Pb powder for copper-silicon-tin-lead-based coating material excellent in high lubrication high conductivity wear resistance characterized in that it is contained separately. delete delete

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