KR100330785B1 - Manufacturing method of high-durability engine parts using PVD coating processing - Google Patents

Abstract

The present invention relates to a method for manufacturing high durability engine parts using a P.D coating process, and more particularly, to a shoe mounted on a piston of a compressor of a conventional air conditioner. The process of heating, etching and coating is performed to form a Cr layer, a WC layer and a WC / C layer. In addition, the WC / C layer is formed of a layer rich in C and a layer rich in WC, thereby coating at a low temperature. This eliminates heat deformation and lowers the coefficient of friction, reducing wear on the swash plate and piston. V. It relates to a high durability engine parts manufacturing method using a de-coating process.

Description

Manufacturing method of high-durability engine parts using PVD coating processing}

The present invention relates to a method for manufacturing high durability engine parts using a P.D coating process, and more particularly, to a shoe mounted on a piston of a compressor of a conventional air conditioner. The process of heating, etching and coating is performed to form a Cr layer, a WC layer and a WC / C layer. In addition, the WC / C layer is formed of a layer rich in C and a layer rich in WC, thereby coating at a low temperature. This eliminates heat deformation and lowers the coefficient of friction, reducing wear on the swash plate and piston. V. It relates to a high durability engine parts manufacturing method using a de-coating process.

In general, the compressor of the air conditioner is a shoe attached to the piston 400 while rotating in the same direction as the swash plate 300 connected to the shaft 200 as the shaft 200 rotates, as shown in FIG. 2. By pushing the shoe 500, the piston 400 moves in a linear direction to compress the refrigerant.

Here, reference numeral 100 denotes a compressor body.

Typically, the shoe 500 of the compressor is made of SUJ2 (Cr-bearing steel) and the swash plate 300 and the piston 400 are made of aluminum.

However, since the hardness difference between the shoe 500, the swash plate 300, and the piston 400 is different, the friction coefficient is large, so that it is easy to be worn, and due to the friction, the role of the lubricating oil is insufficient. There is a problem that wear occurs to stop the operation of the compressor, there is a demand for the development of high-durability parts to improve it.

Accordingly, the present invention has been made to solve the above problems, and more particularly relates to a shoe mounted on the piston of the compressor of the conventional air conditioner, heating, etching and coating using a P. V coating process The Cr layer, the WC layer, and the WC / C layer are formed by performing the process, and the C-rich layer and the WC-rich layer are continuously formed in the WC / C layer, so that the coating can be performed at a low temperature, thereby thermally deforming. Not only that, but also to lower the coefficient of friction to reduce wear with the swash plate and the piston.

1 is a schematic diagram of a P. Decoding process equipment according to the present invention.

Figure 2 is a cross-sectional view showing the mounting of the shoe of the compressor of the present invention.

<Explanation of symbols for main parts of the drawings>

1: process chamber 2, 7: injection hole

3: vacuum pump 4: flat plate magnetron sputtering source

5: SUJ2 substrate 6: WC target

Hereinafter, the present invention will be described.

The present invention is a method for manufacturing a high durability engine component using a P. V coating process consisting of a heating, etching and coating process to produce a high durability compressor shoe, the coating structure of the coating process is Cr layer, WC layer and WC It is characterized by consisting of / C layer.

In particular, the WC / C mixed layer is characterized in that the WC-rich layer and the C-rich layer is formed continuously.

In addition, the chamber internal temperature during the coating process is characterized in that in the range of 150 ~ 250 ℃.

Hereinafter, the process method of the present invention in more detail as follows.

The present invention manufactures an engine component having high durability by using a physical vapor deposition (PVD) coating process, and more particularly, by heating, etching and coding a shoe of a compressor of an air conditioner. The present invention relates to a high durability engine component manufacturing method having high durability and low coefficient of friction.

A more detailed description is as follows.

The present invention largely consists of a three step process, that is, heating, etching and coating process.

In the heating process, when a voltage is applied to a filament, which is a cathode, using a substrate (here, uncoated SUJ2) as an anode, electrons are blown out and incident on the substrate, which is an anode, and is heated by collision with the substrate.

At this time, the temperature inside the chamber is 240 ~ 250 ℃ and the process time is suitable 10 ~ 15 minutes.

The heating process is followed by an etching process to generate metal bonds of the coating to the substrate.

Thus, the etching process removes the thin oxide layer made in air or at high vacuum.

An arc occurs at the auxiliary anode in the chamber, with the substrate negatively biased.

In addition, the substrate draws positive ions from the plasma, and the positive ions accelerate to strike the substrate to remove thin oxide layers or residual contaminants.

At this time, the process pressure is 10 ^-5 Torr and the etching time is about 20 minutes.

Finally, the coating process is the core process of the present invention.

The coating process is performed by a sputtering process.

Referring to the structure of the process equipment, as shown in FIG. 1, argon gas is injected through an injection port 2 in the process chamber 1, a predetermined process is performed, and residual gas or contaminants in the process are vacuum pumps 3. Exit to the outlet via).

In the process chamber 1, an uncoated SUJ2 substrate 5 and a WC target 6 are installed at predetermined positions, and a planar magnetron sputtering source is formed on an outer circumferential surface of the process chamber 1. (4) is mounted.

Here, the flat plate magnetron sputtering source 4 is attached to the Cr target on the front surface to be used in the process.

In general, in the sputtering process, when argon gas is injected into the process chamber 1 and a high voltage is applied in a low vacuum state, plasma is generated by a flat plate magnetron sputtering source 4 to ionize the argon gas. The ion is attracted by the substrate, which is the cathode, and injected into the substrate to form a layer.

In the process chamber of the present invention, the plate magnetron sputtering source acts as a cathode and the anode is several mm apart, so that plasma is generated to ionize the gas, and the ions enter and exit the plate magnetron sputtering source 4. The collision causes the Cr atoms of the Cr target on the front surface of the plate magnetron sputtering source 4 to protrude, which is deposited on the SUS2 substrate 5.

Here, a DC voltage of -600 V is applied to the flat plate magnetron sputtering source 4.

In the present invention, the process was performed while maintaining the internal temperature of the process chamber 1 at 150 to 250 ° C.

In the first of the coating process, two Cr were sputtered to form a thin layer of 0.2 to 0.5 mu m, and then a WC layer was formed by the sputter of WC.

After a few minutes, acetylene, a reaction gas, was injected into the process chamber 1 through the inlet 7.

At that time, acetylene was ionized and C ions were accelerated and implanted into the substrate.

Here, the substrate was rotated during the process to form a WC-rich layer and a C-rich layer in succession.

It is also noted that the process equipment used in the coating process of the present invention is equally applicable to the heating and etching processes.

Reference Figure 1 below shows the structure of the deposited coating layer according to the present invention, Reference Figure 2 shows an enlarged view of the WC / C coating layer in Reference Figure 1.

Comparing the one prepared by the above process with another is as follows.

Reference diagram 1

Reference diagram 2

As shown in FIG. 1, according to the present invention, the SUJ2 substrate was subjected to a process using physical vapor deposition to form three coating layers, that is, a Cr layer, a WC layer, and a WC / C layer.

In particular, as shown in FIG. 2, the WC / C layer has a structure in which a layer rich in C and a layer rich in WC are continuously formed.

Here, the layer rich in C reduces friction in the non-lubricated state, and the layer rich in WC provides excellent wear performance.

Comparative Example 1

Table 1 compares the WC / C coated parts of the present invention with parts coated or uncoated with other materials.

Table 1 shows the results of the pin-on disk testing, in the state of no lubrication, and the rotation speed of the disk was 1000 rpm and rotated about 10,000 times. In addition, the contact pressure between the pin and the specimen is 50 F / cm ² .

EXAMPLE WC / C Coated Material Comparative Example (1) Uncoated Material (SUJ2, SCM) Comparative Example (2) TiN Coated Material Comparative Example (3) CrN coated material Coefficient of friction (μ) 0.13 1.23 0.61 0.70 Friction temperature (℃) 40 to 45 134 90 to 110 80-100 Presence of noise radish U U U

As shown in Table 1, the present invention is not only less than 5 to 10 times less than the friction coefficient of the other comparative example as well as 2 to 3 times less in the friction temperature as well as no noise during friction.

Thus, the WC / C coated material can have high durability.

The shoe mounted on the piston manufactured as described above has a high durability and can be operated even in a non-lubricated state in the compressor.

The high durability engine parts manufacturing method using the P. V coating process according to the present invention as described above relates to a shoe mounted on the piston of the compressor of a conventional air conditioner, which is heated and etched using the P. D coating process. And forming a Cr layer, a WC layer, and a WC / C layer by performing a coating process, and the C-rich layer and the WC-rich layer are continuously formed on the WC / C layer, thereby allowing coating at a low temperature. Not only is there no heat deformation, but also the friction coefficient can be lowered to reduce wear to the swash plate and the piston, and there is no need to tin plate the swash plate, thereby reducing the cost.

Claims (3)

In the manufacturing method of high durability engine parts using P. V. coating process including heating process, etching process, coating process, A heating step of heating the substrate by using a substrate as an anode and applying a voltage to the filament as the cathode; An etching process of negatively biasing the substrate and generating an arc to the auxiliary electrode in the chamber to remove the thin oxide layer or residual contaminants on the substrate; A substrate and a WC target are placed inside the chamber, and a flat plate magnetron sputtering source having a Cr target on the front is placed on the outside, while a low vacuum and a high voltage are applied under an argon gas atmosphere in the chamber, whereby Cr While depositing the layer, the WC layer is deposited by the sputter of the WC, followed by injecting an acetylene reactant gas into the chamber, and simultaneously depositing ionized C ions onto the substrate so that the coating structure of the substrate is Cr, WC and WC / C A coating process for layering; A high durability engine component manufacturing method using a P. V. coating process, characterized in that comprises a. The method of claim 1, wherein the WC / C layer is formed of a WC-rich layer and a C-rich layer continuously. The method of claim 1, wherein the chamber internal temperature is in a range of 150 to 250 ° C. during the coating process.