JP6490325B1 - Scroll parts and scroll compressor - Google Patents

Abstract

A scroll component comprising a fixed scroll made of an aluminum alloy and an orbiting scroll made of an aluminum alloy, wherein at least one of the fixed scroll and the orbiting scroll has an iron-based plating layer formed on a sliding surface thereof, and an iron-based A diffusion layer formed at the interface between the plating layer and the aluminum alloy, containing Al and Fe as main components and at least one selected from the group consisting of Co, Ni, Cu and Zn.

Description

  The present invention relates to a scroll component and a scroll compressor used in a scroll compressor such as an air conditioner.

  A scroll compressor, which is one of the scroll fluid machines, has advantages such as high efficiency, high reliability, and low noise compared to other types of compressors. Widely used in Such a scroll compressor includes a fixed scroll fixed to the frame, and a swinging scroll disposed opposite to the fixed scroll. The scroll compressor is a system that compresses the refrigerant gas by the rotational movement of the scroll, and can increase the output by increasing the rotation speed of the scroll. However, increasing the rotational speed increases the centrifugal force applied to the scroll, causing problems such as mechanical deformation. Therefore, as a measure to reduce the weight of scrolls, studies have been actively conducted to change the material from cast iron to an aluminum alloy with a low specific gravity.However, since aluminum alloys have a low melting point and a low surface hardness, they are slid during operation. Seizure of the moving surface will occur. Therefore, in the scroll made of aluminum alloy, improvement in slidability (prevention of seizure) has been a problem.

  Therefore, Patent Document 1 discloses a scroll type fluid machine that has improved slidability by forming a plating layer made of an iron-based material on a sliding surface of a scroll made of an aluminum alloy. In Patent Document 2, an iron-based film is formed on the surface of a sliding part made of an aluminum alloy, and the surface of the iron-based film is nitrided by performing a heat treatment at 500 ° C. in an ammonia gas atmosphere. A sliding component having a film formed thereon is disclosed.

JP 2005-146874 A Japanese Patent Laid-Open No. 5-71489

  However, in the method disclosed in Patent Document 1, the adhesion of the plating layer made of an iron-based material formed on the surface of the scroll made of an aluminum alloy is weak, and the plating layer is peeled off by friction during operation of the compressor. There was a problem. Further, in the method disclosed in Patent Document 2, since the heat treatment temperature (500 ° C.) is high, the stress applied during the compressor operation due to thermal deformation of the scroll component or the strength reduction of the aluminum alloy after the heat treatment. Thus, there is a problem that the scroll part is distorted and the sealing performance of the refrigerant gas is deteriorated.

  The present invention has been made to solve the above-described problems, and a layer having excellent slidability and adhesion is formed on the sliding surface of a scroll made of an aluminum alloy, and at the time of compressor operation. It aims at providing the scroll components which can suppress the deterioration of the sealing performance of refrigerant gas. Moreover, an object of this invention is to provide the scroll compressor which can suppress the deterioration of the sealing performance of the refrigerant gas at the time of compressor operation.

Aluminum alloys tend to have a lower melting point and lower hardness than ferrous metals used in common sliding parts. Therefore, in order to improve the slidability of the aluminum alloy, it is necessary to form a layer using a material having high hardness on the surface of the aluminum alloy. Moreover, a great amount of stress is applied to the layer formed on the surface of the aluminum alloy when the members slide. Therefore, the interface between the layer formed using a material having high hardness and the aluminum alloy is required to have strong adhesion to such an extent that peeling does not occur during sliding.
Therefore, as a result of intensive studies to solve the above-mentioned problems, the present inventors have formed an iron-based plating layer having a hardness higher than that of the aluminum alloy on the surface of the aluminum alloy. It was found that the performance is improved. Furthermore, the adhesion between the iron-based plating layer and the aluminum alloy is improved by forming a diffusion layer containing a specific metal element that is likely to cause thermal diffusion at the interface between the iron-based plating layer and the aluminum alloy. I found it. Further, since this diffusion layer can be formed at a low temperature, it has been found that the thermal deformation and strength reduction of the aluminum alloy can be suppressed, and the deterioration of the sealing performance of the refrigerant gas during the operation of the compressor can be suppressed. It came to.

That is, the present invention provides a scroll component including a fixed scroll made of an aluminum alloy and a swing scroll made of an aluminum alloy, wherein at least one of the fixed scroll and the swing scroll is an iron-based material formed on a sliding surface thereof. A plating layer; and a diffusion layer formed at an interface between the iron-based plating layer and the aluminum alloy, and containing at least one selected from the group consisting of Al, Fe, and Co, Ni, Cu, and Zn. These are scroll parts characterized by comprising.
Furthermore, the present invention provides an airtight container, a compression mechanism that compresses a fluid that is contained in the airtight container and flows into the airtight container, an electric motor that generates a rotational force, and a rotational force that is generated by the electric motor. A scroll compressor comprising a drive shaft for transmitting to the compression mechanism section, wherein the compression mechanism section includes the scroll component.

ADVANTAGE OF THE INVENTION According to this invention, the layer which is excellent in slidability and adhesiveness is formed in the sliding surface of the scroll which consists of aluminum alloys, and the scroll which can suppress the deterioration of the sealing performance of the refrigerant gas at the time of compressor operation Parts can be provided.
Moreover, according to this invention, the scroll compressor which can suppress the deterioration of the sealing performance of the refrigerant gas at the time of compressor operation can be provided.

3 is a schematic cross-sectional view of a fixed scroll and an orbiting scroll that constitute a scroll component according to Embodiment 1. FIG. 3 is a schematic cross-sectional view of a sliding surface of a scroll component according to Embodiment 1. FIG. 3 is a schematic cross-sectional view of a sliding surface of a scroll component according to Embodiment 1. FIG. 3 is a schematic cross-sectional view of the vicinity of the interface between the iron-based plating layer and the aluminum alloy formed on the sliding surface of the scroll component according to Embodiment 1. FIG. It is a cross-sectional schematic diagram for demonstrating the state by which curved surface processing is given to the edge part of the sliding surface of the scroll component which concerns on Embodiment 1. FIG. It is a cross-sectional schematic diagram for demonstrating the state by which the taper process is given to the edge part of the sliding surface of the scroll component which concerns on Embodiment 1. FIG. It is a cross-sectional schematic diagram for demonstrating the state in which the iron-type plating layer and the ceramic layer are formed in the sliding surface of both the fixed scroll and rocking scroll which comprise the scroll component which concerns on Embodiment 1. FIG. It is a cross-sectional schematic diagram for demonstrating the state in which the iron-type plating layer and the ceramic layer are formed in the sliding surface of one scroll which comprises the scroll component which concerns on Embodiment 1. FIG.

Embodiment 1 FIG.
FIG. 1 is a schematic cross-sectional view of a fixed scroll and an orbiting scroll constituting the scroll component according to the first embodiment. In FIG. 1, a scroll component 1 includes a swing scroll 2 and a fixed scroll 3, and has a sliding surface 1a on which these scrolls rub against each other. 2 and 3 are schematic cross-sectional views of the sliding surface 1a of the scroll component according to the first embodiment. FIG. 4 is a schematic cross-sectional view of the vicinity of the interface between the iron-based plating layer formed on the sliding surface 1a of the scroll component according to Embodiment 1 and the aluminum alloy. In the scroll component shown in FIG. 2, the iron-based plating layer 6 is formed on the surface of the aluminum alloy 5 constituting the scroll, and a plurality of crack portions 11 are present on the surface of the iron-based plating layer 6. . In the scroll component shown in FIG. 3, an iron-based plating layer 6 is formed on the surface of the aluminum alloy 5 constituting the scroll, and nitride and sulfide are the main components on the surface of the iron-based plating layer 6 and the crack portion 11. The ceramic layer 7 is formed. That is, the scroll component shown in FIG. 3 is different from the scroll component shown in FIG. Further, as shown in FIG. 4, a diffusion layer 10 mainly composed of Al and Fe is formed at the interface between the iron-based plating layer 6 and the aluminum alloy 5. As shown in FIG. 2, an iron-based plating layer 6 having a hardness higher than that of the aluminum alloy 5 is formed on the surface of the aluminum alloy 5 serving as the sliding surface 1a, thereby improving the slidability of the surface of the aluminum alloy 5. Can be made. As shown in FIG. 3, an iron-based plating layer 6 and a ceramic layer 7 (hereinafter referred to as an iron-based plating layer 6 and a ceramic layer 7) having higher hardness than the aluminum alloy 5 are formed on the surface of the aluminum alloy 5 serving as the sliding surface 1 a. In some cases, the slidability of the surface of the aluminum alloy 5 can be further improved. Further, by forming the diffusion layer 10 at the interface between the iron-based plating layer 6 and the aluminum alloy 5, the iron-based plating layer 6 and the aluminum alloy 5 are chemically bonded, and the iron-based plating layer 6 with respect to the aluminum alloy 5. And the adhesiveness of the ceramic layer 7 can be improved. Furthermore, since the diffusion layer 10 can be formed at a low temperature by containing a specific metal element that is likely to cause thermal diffusion in the diffusion layer 10, thermal deformation and strength reduction of the aluminum alloy 5 can be suppressed, As a result, it is possible to prevent deterioration of the sealing performance of the refrigerant gas during operation of the compressor.

Since the iron-based plating layer 6 in the scroll component according to the present embodiment has the crack portion 11, adhesion with the ceramic layer 7 is improved. The aluminum alloy 5 as the base material and the iron-based plating layer 6 have a difference in thermal expansion. Therefore, when heat treatment for forming the diffusion layer 10 or heat treatment for forming the ceramic layer 7 is performed, iron having a smaller thermal expansion coefficient than that of the aluminum alloy 5 due to thermal stress caused by the thermal expansion difference. Cracks occur in the system plating layer 6. This crack also contributes to improving the adhesion between the surface of the iron-based plating layer 6 and the ceramic layer 7 formed in the crack portion 11. That is, since the ceramic layer 7 is formed not only on the surface of the iron-based plating layer 6 but also on the crack portion 11, the anchor effect works and the adhesion between the ceramic layer 7 and the iron-based plating layer 6 is improved. To do. Moreover, although the composition of the iron-type plating layer 6 may be only iron, it is preferable that chromium (Cr) is contained from the viewpoint of increasing the hardness of the iron-type plating layer 6. The chromium content in the iron-based plating layer 6 is not particularly limited, but is preferably 3% by mass or more and 15% by mass or less, and more preferably 5% by mass or more and 10% by mass or less. By setting the chromium content to 3 mass% or more and 15 mass% or less, the hardness of the iron-based plating layer 6 is further increased, which is advantageous for improving the slidability of the surface of the aluminum alloy 5.
Although the thickness of the iron-type plating layer 6 is not specifically limited, Preferably it is 2 micrometers or more and 20 micrometers or less, More preferably, they are 5 micrometers or more and 15 micrometers or less. By setting the thickness of the iron-based plating layer 6 to 2 μm or more and 20 μm or less, it is possible to prevent the aluminum alloy 5 from being exposed while increasing the hardness of the iron-based plating layer 6.

The ceramic layer 7 in the scroll component according to the present embodiment is mainly composed of nitride and sulfide. Since nitride is a ceramic having a very high hardness, wear resistance is improved by including nitride in the ceramic layer 7. In addition, although the sulfide has a relatively low hardness, the lubricity is very excellent. Therefore, the sulfide is contained in the ceramic layer 7 to suppress the frictional resistance during sliding. Thus, the slidability of the surface is improved by including nitride and sulfide in the ceramic layer 7. Examples of the nitride that is one of the main components of the ceramic layer 7 include silicon nitride, aluminum nitride, iron nitride, chromium nitride, titanium nitride, and gallium nitride. These nitrides may be used alone or in combination of two or more. Among these nitrides, iron nitride is preferable from the viewpoint of improving slidability. Furthermore, by using iron nitride, the familiarity with the iron-based plating layer 6 as a base is improved, so that the adhesion between the iron-based plating layer 6 and the ceramic layer 7 is improved. Examples of the sulfide that is another main component of the ceramic layer 7 include molybdenum sulfide, tin sulfide, iron sulfide, chromium sulfide, vanadium sulfide, and tungsten sulfide. These sulfides may be used alone or in combination of two or more. Among these sulfides, iron sulfide is preferable from the viewpoint of improving slidability. Furthermore, by using iron sulfide, the familiarity with the iron-based plating layer 6 that is the base is improved, and thus the adhesion between the iron-based plating layer 6 and the ceramic layer 7 is improved. In this specification, the phrase “mainly composed of nitride and sulfide” means that the total amount of nitride and sulfide is 70% by mass or more and 100% by mass or less with respect to the ceramic layer 7. .
The thickness of the ceramic layer 7 in the scroll component according to the present embodiment is not particularly limited, but is preferably 1 μm or more and 10 μm or less, and more preferably 2 μm or more and 5 μm or less. By setting the thickness of the ceramic layer 7 to 1 μm or more and 10 μm or less, the adhesion between the iron-based plating layer 6 and the ceramic layer 7 is improved and the peeling of the ceramic layer 7 can be prevented while improving the slidability. .

  The thickness of the composite layer formed on the sliding surface of the scroll component according to the present embodiment is preferably uniform over the entire sliding surface from the viewpoint of improving the sealing performance of the refrigerant gas. If the thickness of the composite layer is uneven in the convex and concave portions of the sliding surface of the scroll component, a gap is generated in the sliding surface when the swing scroll 2 and the fixed scroll 3 are slid, and the refrigerant gas The sealing performance of the deteriorates. Therefore, the difference between the thickness of the composite layer in the convex part of the sliding surface of the scroll component and the thickness of the composite layer in the concave part is preferably 5 μm or less, more preferably 3 μm or less. When the thickness difference of the composite layer is 5 μm or less, even if a gap is generated on the sliding surface, the oil film of the lubricating oil serves as a substitute for the packing, and deterioration of the sealing performance can be suppressed.

  The diffusion layer 10 in the scroll component according to the present embodiment contributes to improving the adhesion between the iron-based plating layer 6 and the aluminum alloy 5. When the diffusion layer 10 is not present, the iron-based plating layer 6 is in physical contact with the surface of the aluminum alloy 5. Therefore, the adhesion at the interface is very weak, and the iron-based plating layer 6 or the composite layer may be peeled off due to mechanical stress during sliding. Further, since the iron-based plating layer 6 and the aluminum alloy 5 have a difference in thermal expansion as described above, when the diffusion layer 10 is not present, the iron-based plating layer is caused by thermal stress due to frictional heat during sliding. 6 or the composite layer may be peeled off. In the scroll component according to the present embodiment, the iron plating layer 6 and the aluminum alloy 5 are chemically bonded (diffusion bonded) via the diffusion layer 10, so that the iron plating layer 6 and the ceramic for the aluminum alloy 5 are formed. The adhesion of the layer 7 is excellent.

  Since the diffusion layer 10 in the scroll component according to the present embodiment is formed at the interface between the aluminum alloy 5 and the iron-based plating layer 6, the composition thereof is mainly composed of Al and Fe. Furthermore, from the viewpoint of promoting the formation of the diffusion layer 10 and further improving the adhesion between the aluminum alloy 5 and the iron-based plating layer 6, the diffusion layer 10 contains a metal having a larger diffusion coefficient than Al and Fe. Yes. Examples of metals having a larger diffusion coefficient than Al and Fe include Co, Ni, Cu, and Zn. These metals may be used alone or in combination of two or more. The content of these metals is not particularly limited, but is preferably 2% by mass or more and 40% by mass or less, and more preferably 4% by mass or more and 30% by mass or less with respect to the diffusion layer 10. In the present specification, “having Al and Fe as main components” means that the total amount of Al and Fe is 60 mass% or more and 98 mass% or less with respect to the diffusion layer 10. Further, in this specification, the metal content in the diffusion layer 10 is such that a region of 5 μm in the vertical direction from the interface in the cross section in the vicinity of the interface between the aluminum alloy 5 and the iron-based plating layer 6 is electron beam microscopic. A value quantitatively analyzed by an analyzer (EPMA).

  Diffusion layer 10 in the scroll component according to the present embodiment uses thermal diffusion of elements by heat treatment, and requires a heat treatment step for forming diffusion layer 10. However, the aluminum alloy 5 may be distorted when heat-treated at a high temperature. Furthermore, the aluminum alloy 5 may be altered in crystal structure (recrystallization) by heat treatment at a high temperature, and the mechanical strength may be drastically reduced. When a metal having a diffusion coefficient larger than that of Al and Fe is not included in the diffusion layer, a heat treatment at a high temperature of 500 ° C. or higher is required to form the diffusion layer. Mechanical strength is reduced due to alteration. In the scroll component according to the present embodiment, the heat treatment temperature for forming the diffusion layer 10 is 400 ° C. or less by using the diffusion layer 10 containing a metal having a diffusion coefficient larger than that of Al and Fe. It is possible to suppress a decrease in mechanical strength due to thermal strain of alloy 5 and alteration of crystal structure. As a result, it is possible to prevent deterioration of the sealing performance of the refrigerant gas due to thermal distortion and deformation of the scroll component.

A strong mechanical stress is applied to the scroll including the iron-based plating layer 6 and the diffusion layer 10 and the scroll including the iron-based plating layer 6, the ceramic layer 7, and the diffusion layer 10 by sliding. Therefore, it is required to have a mechanical strength that does not cause distortion due to the applied mechanical stress. Therefore, the 0.2% proof stress in the scroll tensile test is preferably 150 MPa or more, more preferably 200 MPa or more, and most preferably 300 MPa or more. When the 0.2% proof stress in the scroll tensile test is 150 MPa or more, distortion does not occur during sliding, and the sliding member is highly reliable.
Here, in this specification, the value evaluated by the method described in JIS Z2411 is used for the 0.2% proof stress in the tensile test.

  The scroll component according to the present embodiment does not adversely affect the slidability and adhesion even if the edge portion of the sliding surface is not processed, but the smoothness of the iron-based plating layer 6 and the ceramic layer 7 is not affected. From the viewpoint, it is preferable that curved edge (R) processing or taper processing is applied to the edge portion of the sliding surface. By applying curved surface processing or taper processing to the edge portion of the sliding surface, the smoothness of the iron-based plating layer 6 and the ceramic layer 7 is improved, and the sealing performance of the refrigerant gas in the scroll component is improved. When the iron-based plating layer 6 is formed on the surface of the aluminum alloy 5 by electrolytic plating, due to the characteristics of electrolytic plating, electrolysis concentrates on the edge portion, and the thickness of the iron-based plating layer 6 at the edge portion may increase. FIG. 5 is a schematic cross-sectional view for explaining a state in which curved edge processing is applied to the edge portion of the sliding surface of the scroll component, and FIG. 6 illustrates that taper processing is applied to the edge portion of the sliding surface of the scroll component. It is a cross-sectional schematic diagram for demonstrating the state currently given. As shown in FIG. 5 and FIG. 6, by applying curved surface processing or taper processing to the edge portion of the aluminum alloy 5, it is possible to suppress the concentration of electrolysis at the edge portion, and to be formed on the surface of the aluminum alloy 5. The iron-based plating layer 6 and the ceramic layer 7 can be made smooth. At this time, the curved surface (R) processing is preferably R0.5 mm or more and R3 mm or less. Further, the taper processing is preferably C0.5 mm or more and C3 mm or less. In the present specification, R means the radius of the curved surface, and C means the distance from the edge portion. When R and C are less than 0.5 mm, the effect of suppressing electrolytic concentration is not sufficiently exhibited, and the smoothness of the iron-based plating layer 6 and the ceramic layer 7 is not improved. On the other hand, when R and C exceed 3 mm, when applied to sliding parts such as scroll parts, the area of the sliding surface decreases, and the pressure applied during sliding increases.

  7 and 8 are enlarged views of the sliding portion 1a of the compressor scroll component 1 according to the present embodiment. In FIG. 7, an iron-based plating layer 6, a ceramic layer 7 and a diffusion layer are formed on the sliding surfaces 1a of the fixed scroll and the swing scroll. In FIG. 8, the iron plating layer 6, the ceramic layer 7, and the diffusion layer are formed only on one sliding surface 1a of the fixed scroll and the swing scroll. Either the iron plating layer 6, the ceramic layer 7 and the diffusion layer are formed on the sliding surfaces 1a of both scrolls constituting the scroll component 1, or the sliding surface 1a of one scroll constituting the scroll component 1, Whether the iron-based plating layer 6, the ceramic layer 7, and the diffusion layer are formed may be appropriately selected according to the slidability required for the scroll component 1. For example, when it is necessary to increase the rotation speed of the scroll of the compressor, high slidability is required. Therefore, the iron-based plating layer 6, the ceramic layer 7, and the sliding surface 1 a of both scrolls It is preferable to form a diffusion layer. In addition, when the high slidability is not required, the formation of the ceramic layer 7 may be omitted.

  The aluminum alloy 5 in the scroll component according to the present embodiment preferably has a Young's modulus of 70 GPa or more from the viewpoint of suppressing deformation due to mechanical stress applied during sliding. The material of the aluminum alloy 5 is not particularly limited, and aluminum alloys for casting, forging, and die casting known in the technical field can be used. Examples of aluminum alloys include Al-Cu-Mg alloys, Al-Cu-Si alloys, Al-Si alloys, Al-Si-Mg alloys, Al-Si-Cu alloys, Al-Si-Mg. Alloy, Al-Si-Cu-Mg alloy, Al-Cu-Ni-Mg alloy, Al-Mg alloy, Al-Si-Cu-Ni-Mg alloy, Al-Si-Fe-Cu alloy Etc.

The scroll component according to the present embodiment can be manufactured as follows.
First, an aluminum alloy is processed into a scroll shape. Here, the method for forming the fixed scroll and the swing scroll with the aluminum alloy is not particularly limited, and a casting method, a forging method, a die casting method, or the like can be used. Moreover, it is also possible to give a surface grinding process as a post process. By performing the surface grinding treatment, the surface smoothness and dimensional accuracy can be improved. Next, a metal layer having a larger diffusion coefficient than the above-described Al and Fe is formed on the surface of the aluminum alloy 5 processed into a scroll shape. A method for forming a metal layer having a larger diffusion coefficient than Al and Fe is not particularly limited, and examples thereof include electrolytic plating, electroless plating, vapor deposition, sputtering, and thermal spraying.
Next, the iron-based plating layer 6 is formed on the surface of the metal layer having a diffusion coefficient larger than that of Al and Fe formed on the surface of the aluminum alloy 5. The method for forming the iron-based plating layer 6 is not particularly limited, and examples thereof include electrolytic plating and electroless plating. When the iron-based plating layer 6 is formed on the scroll-shaped aluminum alloy 5 by electrolytic plating, since the shape is complicated, the current density at the time of energization of plating becomes uneven, and the thickness of the iron-based plating layer 6 is reduced. May be non-uniform. In that case, the current density can be made uniform and the thickness of the iron-based plating layer 6 can be made uniform by using a jig such as an auxiliary electrode. The shape of the auxiliary electrode is not particularly limited as long as the current density can be made uniform, but is preferably a shape similar to the spiral shape of the scroll.
Next, the aluminum alloy 5 on which the iron-based plating layer 6 is formed is heat-treated in a vacuum or heat-treated in a mixed gas atmosphere containing nitrogen gas and hydrogen sulfide gas. By this heat treatment, cracks due to a difference in thermal expansion occur on the surface of the iron-based plating layer 6 and at the same time, a diffusion layer 10 is formed at the interface between the iron-based plating layer 6 and the aluminum alloy 5. When heat treatment is performed in a mixed gas atmosphere containing nitrogen gas and hydrogen sulfide gas, a ceramic mainly composed of nitride and sulfide is formed on the surface of the iron-based plating layer 6 and the crack portion 11 by reaction with the mixed gas. Layer 7 is formed. The heat treatment temperature is not particularly limited, but is preferably 200 ° C. or higher and 400 ° C. or lower, more preferably 250 ° C. or higher and 350 ° C. or higher, from the viewpoint of suppressing thermal distortion and crystal structure deterioration of the aluminum alloy 5. . When the heat treatment temperature is less than 200 ° C., the diffusion layer 10 is difficult to be formed, and the adhesion may not be sufficiently improved. Further, since the reaction between the iron-based plating layer 6 and the mixed gas is difficult to proceed, the formation of the ceramic layer 7 on the surface of the iron-based plating layer 6 and the crack portion 11 becomes insufficient. On the other hand, when the heat treatment temperature exceeds 400 ° C., the crystal structure of the aluminum alloy 5 is deteriorated (such as coarsening of crystal grains), and the sealing performance of the refrigerant gas is deteriorated due to the distortion of the scroll parts and the decrease in mechanical strength. Occur.

According to the first embodiment, a layer having excellent slidability and adhesion is formed on the sliding surface of the scroll made of an aluminum alloy, and the deterioration of the sealing performance of the refrigerant gas during compressor operation can be suppressed. Scroll parts that can be made.
In the present embodiment, the scroll part for the compressor is taken as an example, but the present invention can be applied to other aluminum alloy sliding parts.

Embodiment 2. FIG.
The scroll compressor according to the second embodiment is a so-called vertical scroll compressor that compresses and discharges a working gas such as a refrigerant. The scroll compressor includes a sealed container, a compression mechanism, an electric motor that generates a rotational force, and a drive shaft that transmits the rotational force generated by the electric motor to the compression mechanism. The sealed container is formed in a cylindrical shape, for example, and has pressure resistance. A suction pipe for taking the working gas into the sealed container is connected to one side of the sealed container, and a discharge pipe for releasing the compressed working gas from the sealed container to the other side of the sealed container. It is connected.
In the scroll compressor of the present embodiment, the compression mechanism unit incorporates the scroll component according to the first embodiment. By incorporating the scroll component according to the first embodiment, the centrifugal force of the scroll component generated during the operation of the compressor is reduced. In addition, the slidability is improved by the iron-based plating layer, ceramic layer, and diffusion layer formed on the surface of the aluminum alloy. Therefore, by increasing the rotation speed of the scroll component, the refrigerant gas compression efficiency is improved, and the scroll compressor can have a higher output. The method for incorporating the scroll component into the scroll compressor is not particularly limited, and can be performed according to a known method.

  According to the second embodiment, it is possible to provide a scroll compressor that does not deteriorate the sealing performance of the refrigerant gas and can achieve high output by high speed operation.

  Hereinafter, although a simulation test for verifying the effect of improving the slidability and adhesion of the scroll component of the present invention will be described with reference to Examples and Comparative Examples, the present invention is not limited thereto. In this simulation test, a test piece in which layers similar to the iron-based plating layer, ceramic layer, and diffusion layer formed on the sliding surface of the scroll component of the present invention were prepared and evaluated.

[Example 1]
On the surface of an Al—Si—Cu—Mg-based aluminum alloy (ADC14, Young's modulus: 80 GPa), a Zn film having a thickness of about 0.5 μm was formed by electrolytic plating. Next, an Fe—Cr plating layer having a composition of 92 mass% Fe-8 mass% Cr was formed on the surface of the Zn film so as to have a thickness of about 10 μm by electrolytic plating. Next, heat treatment is performed at 350 ° C. for 5 hours in a mixed gas containing nitrogen and hydrogen sulfide to form a diffusion layer (Zn content: 5% by mass) containing Al and Fe as main components and containing Zn, A ceramic layer mainly composed of iron nitride and iron sulfide was formed on the surface of the Fe—Cr plating layer to obtain a test piece of Example 1. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 2]
Example 2 was performed in the same manner as in Example 1 except that a Ni film was formed instead of the Zn film, and a diffusion layer (Ni content: 6% by mass) containing Al and Fe as main components and containing Ni was formed. The test piece was obtained. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 3]
Example 3 was carried out in the same manner as in Example 1 except that a Cu film was formed instead of the Zn film, and a diffusion layer (Cu content: 5% by mass) containing Al and Fe as main components and containing Cu was formed. The test piece was obtained. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 4]
A Zn and Ni film was formed instead of the Zn film, and a diffusion layer (Zn content: 3 mass%, Ni content: 4 mass%) containing Al and Fe as main components and containing Zn and Ni was formed. Except that, the test piece of Example 4 was obtained in the same manner as Example 1. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 5]
A test piece of Example 5 was obtained in the same manner as Example 1 except that an Fe plating layer was formed instead of the Fe—Cr plating layer. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 6]
Implementation was performed in the same manner as in Example 1 except that a 97 mass% Fe-3 mass% Cr composition Fe-Cr plating layer was formed instead of the 92 mass% Fe-8 mass% Cr composition Fe-Cr plating layer. The test piece of Example 6 was obtained. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 7]
Implementation was performed in the same manner as in Example 1 except that an Fe-Cr plating layer having an 85 mass% Fe-15 mass% Cr composition was formed instead of the Fe-Cr plating layer having a 92 mass% Fe-8 mass% Cr composition. The test piece of Example 7 was obtained. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 8]
Implementation was performed in the same manner as in Example 1 except that an Fe-Cr plating layer having an 81 mass% Fe-19 mass% Cr composition was formed instead of the Fe-Cr plating layer having a 92 mass% Fe-8 mass% Cr composition. The test piece of Example 8 was obtained. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm, and the thickness of the ceramic layer was 5 μm.

[Example 9]
A test piece of Example 9 was obtained in the same manner as in Example 1 except that the heat treatment in the mixed gas containing nitrogen and hydrogen sulfide was changed to the heat treatment in vacuum, and the ceramic layer was not formed. In the obtained test piece, the thickness of the Fe—Cr plating layer (iron-based plating layer) was 10 μm.

[Comparative Example 1]
An Al-Si-Cu-Mg-based aluminum alloy (ADC14) itself was used as a test piece.

[Comparative Example 2]
A test piece of Comparative Example 2 was obtained in the same manner as in Example 1 except that a Zn film was not formed and a diffusion layer made of Al and Fe was formed.

[Comparative Example 3]
A test piece of Comparative Example 3 was obtained in the same manner as in Example 1 except that the Zn film was not formed, the heat treatment condition was changed to 500 ° C. for 5 hours, and a diffusion layer composed of Al and Fe was formed.

  The slidability was evaluated for the test pieces obtained in the above examples and comparative examples. As for slidability, the seizure resistance by the pin-on-disk method was measured. The measurement result of seizure strength is based on the seizure strength obtained with the test piece of Example 1, and the relative value of seizure strength obtained with the test piece of each example or each comparative example ([each implementation Tables 1 and 2 show the values of seizure yield obtained with the test pieces of Examples or Comparative Examples] / [seizure yield obtained with the test pieces of Example 1]. In this specification, the seizure strength by the pin-on-disk method was implemented by the following method. First, 0.2 ml of oil was applied to the surface of a disk having a diameter of 44 mm. Next, three pins each having a diameter of 4 mm were arranged on a circumference of 36 mm from the center of the disk at intervals of 120 °, and the seizure resistance was measured while rotating the disk at a rotation speed of 1000 rpm.

  Moreover, about the test piece obtained by said Example and comparative example, the adhesiveness evaluation of the layer formed in the surface of aluminum alloy was implemented. For adhesion, the peel strength of the layer was measured by the cycas method. The measurement result of the peel strength is based on the peel strength of the layer obtained with the test piece of Example 1, and the relative value of the peel strength of the layer obtained with the test piece of each Example or each Comparative Example ([each Tables 1 and 2 show the values of (peeling strength of layers obtained with test pieces of Examples or Comparative Examples) / [peeling strength of layers obtained with test pieces of Example 1]).

  Furthermore, the presence or absence of the distortion of the test piece by heat processing was evaluated about the test piece obtained by said Example and comparative example. The presence or absence of strain was measured by measuring the shape of the test piece before and after the heat treatment using a three-dimensional shape measuring machine and comparing the change in shape. When there was a shape change, the distortion was “present”, and when there was no shape change, the distortion was “none”.

  As shown in Tables 1 and 2, on the surface of the aluminum alloy, a diffusion layer containing Al and Fe as main components and containing one or two of Zn, Ni and Cu, an iron-based plating layer, and iron nitride And the test piece of Examples 1-8 in which the ceramic layer mainly composed of iron sulfide was formed, compared with the test piece of Comparative Example 1 which is an untreated Al-Si-Cu-Mg-based aluminum alloy, Since the seizure resistance is very high, it can be seen that the slidability is extremely excellent. The test piece of Example 9 in which a diffusion layer containing Al and Fe as main components and containing one or two of Zn, Ni and Cu and an iron-based plating layer was formed on the surface of the aluminum alloy was untreated. Compared with the test piece of the comparative example 1 which is an Al-Si-Cu-Mg-type aluminum alloy, since seizure proof stress is high, it turns out that slidability is excellent. Since the test pieces of Examples 1 to 9 have higher peel strength than the test piece of Comparative Example 2 in which a diffusion layer made of Al and Fe is formed, the adhesion of the layer formed on the surface of the aluminum alloy is high. It turns out that it is excellent. Although the test piece of Comparative Example 3 in which the heat treatment conditions were changed to 500 ° C. for 5 hours and a diffusion layer made of Al and Fe was formed, the adhesion of the layer tends to be improved as compared with the test piece of Comparative Example 2. Since the heat treatment temperature is high, the test piece is distorted.

  As can be seen from the above results, according to the present invention, a layer having excellent slidability and adhesion is formed on the sliding surface of the scroll made of an aluminum alloy, and the sealing property of the refrigerant gas during the compressor operation is improved. The scroll component which can suppress deterioration can be provided.

  Note that this international application claims priority based on Japanese Patent Application No. 2017-242598 filed on December 19, 2017, and the entire contents of this Japanese patent application are incorporated herein by reference. To do.

  DESCRIPTION OF SYMBOLS 1 Scroll part, 1a Sliding surface, 2 Swing scroll, 3 Fixed scroll, 5 Aluminum alloy, 6 Iron-type plating layer, 7 Ceramic layer, 10 Diffusion layer, 11 Crack part.

Claims (6)

In a scroll component comprising a fixed scroll made of an aluminum alloy and a swing scroll made of an aluminum alloy,
At least one of the fixed scroll and the orbiting scroll is formed at the interface between the iron-based plating layer formed on the sliding surface and the iron-based plating layer and the aluminum alloy, and is mainly composed of Al and Fe. And a diffusion layer containing at least one selected from the group consisting of Co, Ni, Cu and Zn, and a ceramic layer mainly formed of nitride and sulfide, which is formed on the surface and crack portion of the iron-based plating layer scroll part, characterized in that it comprises and. The scroll component according to claim 1 , wherein the main component of the ceramic layer is iron nitride and iron sulfide. The scroll component according to claim 1 or 2 , wherein the iron-based plating layer contains 3 mass% or more and 15 mass% or less of Cr. The scroll part according to any one of claims 1 to 3 , wherein an edge portion of the sliding surface is subjected to curved surface processing or taper processing. The scroll component according to any one of claims 1 to 4 , wherein a Young's modulus of the aluminum alloy is 70 GPa or more. An airtight container, a compression mechanism that is contained in the airtight container and compresses the fluid flowing into the airtight container, an electric motor that generates a rotational force, and a drive that transmits the rotational force generated by the electric motor to the compression mechanism A scroll compressor having a shaft,
The scroll compressor including the scroll component according to any one of claims 1 to 5 .

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