CN111349827A - Aluminum alloy for compressor sliding member, forged compressor sliding member, and method for producing forged compressor sliding member - Google Patents
Aluminum alloy for compressor sliding member, forged compressor sliding member, and method for producing forged compressor sliding member Download PDFInfo
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- CN111349827A CN111349827A CN201911335632.2A CN201911335632A CN111349827A CN 111349827 A CN111349827 A CN 111349827A CN 201911335632 A CN201911335632 A CN 201911335632A CN 111349827 A CN111349827 A CN 111349827A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Abstract
An aluminum alloy for a compressor sliding member, which contains Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of aluminum alloy containing Al and inevitable impurities, the tensile strength at 25 ℃ being 330 to 380 MPa; the ratio of the area of the Al-Mn-Si intermetallic compound having a circle equivalent diameter of 0.5 to 5 μm to the area of the Al-Mn-Si intermetallic compound having a circle equivalent diameter of 0.5 μm or more is 90% or more; there is no crystal containing 1 mass% or more of Cu and having an equivalent circle diameter of more than 5 μm.
Description
Technical Field
The present invention relates to a sliding member represented by a compressor (compressor) for a vehicle air conditioner, and particularly to an aluminum alloy which can be suitably used for a scroll (scroll) and an electric scroll.
Background
In view of recent demands for improved fuel economy in the automobile industry, there is an increasing demand for weight reduction and higher functionality of various members used in automobiles, for example, compressors for vehicle air conditioners. Various types of compressors for vehicle air conditioners exist, and with the background described above, scroll compressors are becoming popular as small-sized compressors. For such members, aluminum alloys having a high specific strength, which is a ratio of strength to weight, have come to be used instead of steel materials and cast iron materials. In particular, a forged material made of an aluminum alloy such as an Al — Si alloy which has high strength at high temperatures and is excellent in wear resistance during sliding, which is usable even in a severe environment in a high-temperature atmosphere, as typified by the above-described compressor for an air conditioner for a vehicle, has attracted attention.
In the production of such an aluminum alloy forged material, for example, as described in patent document 1, a predetermined aluminum alloy having a predetermined metal composition is molded by die casting, and subjected to a predetermined heat treatment, thereby producing a scroll for a vehicle air conditioner.
However, when a scroll is manufactured using the aluminum alloy as described above, alumite (alumite) is performed as a final step, but since metals such as Si, Cu, and Mg are added to aluminum at high concentrations in order to secure mechanical properties of the aluminum alloy that becomes the matrix, there are the following problems: these added metals, particularly Cu, inhibit the growth of the aluminum oxide film, and cause the aluminum oxide film (alumite film) to have uneven thickness and reduced hardness.
In order to solve the above problem, for example, as described in patent document 2, aluminum alloys for scrolls are produced in which the amount of Cu added is suppressed. In patent document 2, the uniformity of the thickness of the aluminum oxide film and the hardness of the aluminum oxide film are improved by suppressing the amount of Cu added to inhibit the growth of the aluminum oxide film, thereby improving the treatability of the aluminum oxide film.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 2005-281742
Patent document 2: japanese patent laid-open No. 2005-330560
Disclosure of Invention
However, in patent document 2, since the addition of Cu element which greatly contributes to the improvement of strength is suppressed, there is a disadvantage that the strength is inferior to the aluminum alloy described in patent document 1 and the like.
The preferred embodiments of the present invention have been made in view of the above and/or other problems in the related art. Preferred embodiments of the present invention are those that enable significant improvements in existing methods and/or apparatus.
The present invention has been made in view of the above-mentioned background, and an object thereof is to provide an aluminum alloy for a compressor sliding member, which has excellent aluminum oxide film treatability and sufficient tensile strength.
Other objects and advantages of the present invention will be apparent from the following preferred embodiments.
In order to achieve the above object, the present inventors have intensively studied and found that: the present inventors have found that by suppressing the addition amount of Si, Cu, Mg, and particularly Cu to a low concentration, good alumite treatability can be ensured, and by adding another element to such an extent that the alumite treatability is not hindered, tensile strength can be improved, and thus the present invention has been completed. That is, the present invention provides the following aspects.
[1] An aluminum alloy for a compressor sliding member, characterized by containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of Al and inevitable impurities,
the tensile strength of the aluminum alloy at 25 ℃ is 330MPa to 380MPa,
the ratio of the area of the intermetallic Al-Mn-Si compound having a circle-equivalent diameter (i.e., circle-equivalent diameter) of 0.5 to 5 μm to the area of the intermetallic Al-Mn-Si compound having a circle-equivalent diameter of 0.5 μm or more is 90% or more,
the aluminum alloy is free of crystals containing 1 mass% or more of Cu and having a circle equivalent diameter of more than 5 [ mu ] m.
[2] The aluminum alloy for compressor sliding member according to the aforementioned item 1, wherein primary crystal Si is not present.
[3] The aluminum alloy for a compressor sliding member according to item 1 or 2 above, wherein the compressor sliding member is a compressor scroll member.
[4] A forged product of a compressor sliding member, which is composed of the aluminum alloy for a compressor sliding member as recited in the aforementioned item 1 or 2.
[5] A forged product of a compressor sliding member, which is obtained by forming an aluminum oxide film (alumina film) having a Vickers hardness of 400 or more on the surface of a forged product of a compressor sliding member comprising the aluminum alloy for a compressor sliding member described in the aforementioned item 1 or 2.
[6] A forged compressor scroll member product comprising the aluminum alloy for compressor sliding members as recited in the aforementioned item 1 or 2, wherein an aluminum oxide film having a Vickers hardness of 400 or more is formed on the surface of the forged compressor scroll member product.
[7] A forged product of a scroll member for an electric compressor, which is obtained by forming an alumina coating having a Vickers hardness of 400 or more on the surface of a forged product of a scroll member for an electric compressor comprising the aluminum alloy for a compressor sliding member as defined in the aforementioned item 1 or 2.
[8] A method of manufacturing a forged product of a sliding member of a compressor, comprising:
a melt forming step of obtaining a melt of an aluminum alloy containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance including Al and inevitable impurities;
a casting step of obtaining a casting material by casting the obtained melt;
a homogenization heat treatment step of performing homogenization heat treatment for maintaining the cast material at 470 to 500 ℃ for 0.5 to 6.0 hours;
a forging step of forging the casting material subjected to the homogenization heat treatment to obtain a forged product;
a solution treatment step of subjecting the forged product to solution treatment at a temperature of 500 to 545 ℃;
a quenching step of quenching the forged product subjected to the solution treatment; and
and an aging treatment step of heating the quenched forged product at a temperature of 160 to 220 ℃ for 1 to 18 hours.
The effects of the present invention are as follows.
According to the invention as recited in the item [1], an aluminum alloy for a compressor sliding member having excellent aluminum oxide film treatability and sufficient tensile strength can be provided.
According to the invention as recited in the item [2], an aluminum alloy for a compressor sliding member having more excellent aluminum oxide film treatability can be provided.
According to the invention as recited in the aforementioned item [3], an aluminum alloy for compressor scroll members having excellent aluminum oxide film treatability and sufficient tensile strength can be provided.
According to the invention as recited in the aforementioned item [4], a forged product of a compressor sliding member having excellent alumite treatability and sufficient tensile strength can be provided.
According to the invention as recited in the aforementioned item [5], a forged product of a compressor sliding member having an alumina coating film with a uniform thickness and excellent film strength and having sufficient tensile strength can be provided.
According to the invention as recited in the aforementioned item [6], a forged compressor scroll member having an alumina coating film with a uniform thickness and excellent film strength and having sufficient tensile strength can be provided.
According to the invention as recited in the aforementioned item [7], a forged product of a scroll member for an electric compressor, which has an alumina coating film having a uniform film thickness and excellent film strength and which has sufficient tensile strength, can be provided.
According to the invention as recited in the aforementioned item [8], a forged product of a compressor sliding member having excellent alumite treatability and sufficient tensile strength can be produced.
Drawings
FIG. 1 is a perspective view showing a cast material before forging.
Fig. 2 is a perspective view showing an example of a forged product of a compressor sliding member according to the present invention.
Description of the reference numerals
10 … casting material
20 … forged product of sliding part of compressor
Detailed Description
The aluminum alloy for a compressor sliding member according to the present invention is characterized by containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of aluminum alloy containing Al and unavoidable impurities, wherein the aluminum alloy has a tensile strength at 25 ℃ of 330 to 380MPa, a ratio of an area of an Al-Mn-Si intermetallic compound having a size with a circle-equivalent diameter of 0.5 to 5 [ mu ] m to an area of an Al-Mn-Si intermetallic compound having a circle-equivalent diameter of 0.5 [ mu ] m or more of 90% or more (in an observation field when observed at 5000 times by using FE-SEM), and wherein crystals containing 1 mass% or more of Cu and having a circle-equivalent diameter of more than 5 [ mu ] m are absent from the aluminum alloy. With such a configuration, it is possible to provide an aluminum alloy for a compressor sliding member having excellent aluminum oxide film treatability and sufficient tensile strength.
A forged compressor sliding member product, which is obtained by forming an alumina coating having a Vickers Hardness (HV) of 400 or more on the surface of a forged compressor sliding member product made of the aluminum alloy for compressor sliding members, has an alumina coating having a uniform thickness and excellent film strength, and has sufficient tensile strength.
In the present invention, the ratio of the area of the Al-Mn-Si intermetallic compound having a circle-equivalent diameter of 0.5 to 5 μm to the area of the Al-Mn-Si intermetallic compound having a circle-equivalent diameter of 0.5 μm or more in the structure observation by FE-SEM is 90% or more, and the effect of improving the tensile strength at 25 ℃ can be obtained. Further, the absence of a crystal containing 1 mass% or more of Cu and having an equivalent circle diameter of more than 5 μm can provide an effect of suppressing a decrease in the alumite treatability.
Next, a method for producing a forged compressor sliding member product according to the present invention will be described. The manufacturing method includes: a melt forming step of obtaining a melt of an aluminum alloy containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance including Al and inevitable impurities; and a casting step of obtaining a casting material by casting the melt obtained as described above.
(melt formation step)
In the melt forming step, the melt is prepared so as to be a melt containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of Al and inevitable impurities.
(casting step)
Next, the melt obtained as described above is cast to obtain a cast product 10 (see fig. 1). The casting method is not particularly limited, and conventionally known methods may be used, and examples thereof include a continuous casting and rolling method, a hot-top casting method, a float casting method, a semi-continuous casting method (DC casting method), and the like. Cast materials having a diameter of, for example, 60mm to 90mm are obtained.
Hereinafter, the homogenizing heat treatment step, the cutting step, the forging step, the solution treatment step, the quenching step, the aging treatment step, and the shot blasting step may be performed in this order.
(homogenizing Heat treatment Process)
The obtained cast material was subjected to a homogenizing heat treatment. That is, the casting material may be subjected to a homogenizing heat treatment by maintaining the casting material at 470 to 500 ℃ for 0.5 to 6.0 hours.
(cutting Process)
The cast material subjected to the homogenization heat treatment is cut into a predetermined length to obtain a cast material for forging.
(forging Process)
The cast material is forged to obtain a forged product 20 (see fig. 2). In the forging step, the die temperature may be set to 100 to 300 ℃, and the material temperature (casting material temperature) may be set to 370 to 510 ℃.
(solution treatment step)
Next, the solution treatment is performed, but the temperature of the solution treatment may be set to 500 to 545 ℃. The treatment time for the solution treatment may be set to 0.5 to 6 hours.
(quenching Process)
Next, quenching treatment is performed. The quenching treatment can be carried out in water of 15-60 ℃ for quenching.
(aging treatment Process)
Next, the quenched forged product is heated at 160 to 220 ℃ for 1 to 18 hours to perform aging treatment.
(shot peening) Process)
In the shot peening step, the forged product subjected to the aging treatment is cut by machining, and shot peening (peening) is performed to plastically work the vicinity of the surface, thereby improving the fatigue strength, but the abrasive grain size is preferably 1mm or less. Examples of the abrasive grain species include SUS304 and alumina. The shot pressure is preferably 1MPa or less.
The forged product thus obtained has excellent alumite treatability and sufficient tensile strength, and therefore can be suitably used as a sliding member for a vehicle air conditioner. The above-described manufacturing method can provide a forged product having a tensile strength at 25 ℃ of 330MPa to 380MPa, a ratio of the area of an Al-Mn-Si intermetallic compound having a size with a circle-equivalent diameter of 0.5 μm to 5 μm to the area of an Al-Mn-Si intermetallic compound having a circle-equivalent diameter of 0.5 μm or more of 90% or more, and no crystal having a circle-equivalent diameter of more than 5 μm and containing 1% by mass or more of Cu.
Next, the composition of the aluminum alloy for compressor sliding member and the "aluminum alloy" in the method for producing a forged product of a compressor sliding member according to the present invention will be described in detail below. The aluminum alloy contains Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of Al and inevitable impurities.
The above-mentioned Si (component) has an effect of improving the strength. However, if the amount is excessively added, coarse primary Si grains are crystallized, resulting in a decrease in strength. In addition, primary crystal Si inhibits progress of anodization, and therefore, the alumite treatability is also lowered. If the Si content is less than 8.0 mass%, a sufficient tensile strength cannot be obtained. On the other hand, if the Si content exceeds 12.0 mass%, coarse primary Si grains are crystallized to lower the tensile strength, and the alumite treatability is also deteriorated. Therefore, the Si content is set to a range of 8.0 mass% to 12.0 mass%.
The Cu (component) has an effect of improving the tensile strength. The effect of improving the tensile strength is caused by the precipitation of Cu, and the above-described effects can be obtained by obtaining a supersaturated solid solution by solution treatment and then performing aging treatment. However, if a Cu-based crystal is present, the Cu-based crystal hinders progress of anodization during alumite treatment, and thus alumite treatability is lowered. If the Cu content is less than 0.6 mass%, sufficient precipitation strengthening cannot be obtained, and the strength is not improved. On the other hand, if the Cu content exceeds 1.2 mass%, the alumite treatability is significantly reduced. Therefore, the Cu content is set to a range of 0.6 mass% to 1.2 mass%. Among them, the Cu content is preferably in the range of 0.8 to 1.1 mass%.
The Mg (component) has an effect of improving the tensile strength as in Cu. Mg is solid-dissolved during casting, and forms a compound with Si and Cu and precipitates during aging treatment, thereby contributing to improvement of tensile strength. Such tensile strength improving effect is remarkably exhibited when the Mg content is 0.2 mass% or more, and the effect is not remarkably exhibited when the Mg content exceeds 0.8 mass%. Therefore, the Mg content is set to a range of 0.2 mass% to 0.8 mass%. Among them, the Mg content is preferably in the range of 0.4 to 0.6 mass%.
The Mn (component) has an effect of improving the tensile strength. Mn is crystallized in a granular form in the form of an Al-Mn-Si intermetallic compound at the time of casting, contributing to an increase in tensile strength. Such an effect of improving the tensile strength is small when the Mn content is less than 0.05 mass%, and when the Mn content exceeds 0.8 mass%, coarse crystals are formed, which causes a decrease in strength. Therefore, the Mn content is set to a range of 0.05 mass% to 0.8 mass%. Among them, the Mn content is preferably in the range of 0.3 to 0.6 mass%.
In the aluminum alloy of the present invention, it is desirable that the total content of Cr, Zn, Fe, Ni, Co, V, Mo, Zr, Sc, Hf, Ce, Nb, Er and Yb is at most 0.5 mass%. If it exceeds 0.5 mass%, it is crystallized earlier than the Al matrix phase to become coarse crystals, which causes a reduction in ductility and a reduction in tensile strength.
In the present invention, the equivalent circle diameter of the Al-Mn-Si intermetallic compound is a value converted as the diameter of a circle having the same area as the area of the Al-Mn-Si intermetallic compound in an SEM photograph (image) of a cross section of the aluminum alloy material.
Examples
Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.
< example 1>
An aluminum alloy melt containing 10.0 mass% of Si, 0.9 mass% of Cu, 0.3 mass% of Mg, 0.5 mass% of Mn, and the balance Al and inevitable impurities was continuously cast to obtain a cast material (casting material) having a diameter of 82mm, the cooling rate during casting was 15 ℃/sec, the obtained cast material was subjected to homogenization heat treatment by heating at 470 ℃ for × 7 hours, and then cooled in air.
The cast material was cut into a length of 30mm, and then forged at a raw material temperature of 420 ℃ and a die temperature of 180 ℃. In the forging, assuming the bottom portion of the scroll forged product, 80% upsetting was performed in a direction parallel to the axial direction of the cast material, and a forged material was obtained.
The forging material was heated at 510 ℃ for 3 hours to be subjected to solution treatment, and then water quenching treatment was performed using water at 25 ℃. Subsequently, the resultant was heated at 180 ℃ for 8 hours to carry out artificial aging treatment, thereby obtaining a forged product.
< examples 2 and 3>
A forged product was obtained in the same manner as in example 1, except that the aluminum alloy melt having the alloy composition (containing inevitable impurities) shown in table 1 was used.
< example 4>
A forged product was obtained in the same manner as in example 1, except that the aluminum alloy melt having the alloy composition (including inevitable impurities) shown in table 1 was used and the solution treatment temperature was set to 540 ℃.
< comparative examples 1 to 8>
A forged product was obtained in the same manner as in example 1, except that the aluminum alloy melt having the alloy composition (containing inevitable impurities) shown in table 1 was used.
< comparative example 9>
A forged product was obtained in the same manner as in example 1, except that the aluminum alloy melt having the alloy composition (including inevitable impurities) shown in table 1 was used and the solution treatment temperature was set to 550 ℃.
< comparative example 10>
A forged product was obtained in the same manner as in example 1, except that the aluminum alloy melt having the alloy composition (including inevitable impurities) shown in table 1 was used and the solution treatment temperature was set to 490 ℃.
TABLE 1
Each forged product obtained as described above was evaluated by the following evaluation method.
< method for evaluating hardness of alumina coating >
In order to measure the hardness of the alumina film, the forged article was subjected to alumite treatment. The alumite treatment is carried out under the conditions that the concentration of electrolyte is 150g/L of free sulfuric acid and the current density is 3A/dm2The obtained aluminum oxide film-treated product was cut, mirror-finished by buff polishing, and then vickers hardness of the aluminum oxide film was measured using MICRO HARDNESS TESTER HMV manufactured by Shimadzu corporation, the hardness was measured in the thickness direction of the aluminum oxide film, and the load was 0.01g, the measurement results are shown in Table 2, and in Table 2, the case where the vickers Hardness (HV) was less than 400 was designated as "×", and the case where the vickers Hardness (HV) was 400 or more was designated as "○".
< tensile Strength test method >
In order to perform the tensile test, a forged product was cut into a predetermined size and processed to obtain a tensile sample of JIS4, the obtained sample was subjected to the tensile test using AG100kNXplus manufactured by shimadzu according to the provisions of JIS Z2241, and the tensile strength (MPa) at 25 ℃ was measured, and the measurement results are shown in table 2, the case where the tensile strength was 330MPa to 380MPa was designated as "○", and the case where the tensile strength was out of the above range was designated as "×".
< method of observing tissue >
For the purpose of structure observation, the forged product was cut into a predetermined size. The observation surface is a surface parallel to the forging direction. The cut sample was processed into an observation surface (CROSS SECTOION POLISHER IB-19530CP manufactured by JEOL Ltd.), and then observed at a magnification of 5000 times with FE-SEM (JSM-7900F manufactured by JEOL Ltd.). EDS analysis (Multi energy Dispersion X-ray microanalyzer Aztec energy Advanced X-MAXN80, manufactured by OXFORD INSTRUMENTS) was performed on the observation field to obtain "the maximum equivalent circle diameter of a crystal containing 1 mass% or more of Cu", "the presence or absence of primary crystal Si", "the area ratio occupied by 0.5 to 5 μm among Al-Mn-Si intermetallic compounds having a particle size of 0.5 μm or more". These results are shown in table 2.
It is clear from the results that the forged products of examples 1 to 4 of the present invention have a high hardness of the alumina coating film and a sufficient tensile strength.
In contrast, in comparative examples 1 to 10, which do not fall within the scope of the present invention, at least one of the hardness (alumite treatability) and tensile strength of the alumina scale is inferior.
In comparative example 9, since the solution treatment temperature was high, the temperature exceeded the solidus temperature and melting (partial melting) occurred, and thus the above-described various evaluations were not performed. In comparative example 10, since the solution treatment temperature was low, a sufficiently supersaturated solid solution was not obtained, and the tensile strength at room temperature was insufficient.
Industrial applicability
The compressor slide member made of the aluminum alloy for a compressor slide member according to the present invention and the compressor slide member forged product obtained by the production method according to the present invention can be suitably used as a slide member typified by a compressor (compressor) for an air conditioner for a vehicle, particularly a scroll or an electrically driven scroll.
The present application is accompanied by the priority requirements of japanese patent application No. 2018-239014, which was applied 12/21 in 2018, the disclosure of which constitutes a part of the present application as such.
It must be recognized that: the terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.
Claims (8)
1. An aluminum alloy for a compressor sliding member, which contains Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance of Al and inevitable impurities,
the tensile strength at 25 ℃ is 330MPa to 380 MPa;
the ratio of the area of the Al-Mn-Si intermetallic compound having a circle equivalent diameter of 0.5 to 5 μm to the area of the Al-Mn-Si intermetallic compound having a circle equivalent diameter of 0.5 μm or more is 90% or more;
there is no crystal containing 1 mass% or more of Cu and having an equivalent circle diameter of more than 5 μm.
2. The aluminum alloy for compressor sliding members according to claim 1, wherein primary crystal Si is not present.
3. The aluminum alloy for compressor sliding member according to claim 1 or 2, which is a compressor scroll member.
4. A forged product of a compressor sliding member, which is composed of the aluminum alloy for a compressor sliding member according to claim 1 or 2.
5. A forged product of a compressor sliding member, which is obtained by forming an alumina scale having a Vickers hardness of 400 or more on the surface of a forged product of a compressor sliding member comprising the aluminum alloy for a compressor sliding member according to claim 1 or 2.
6. A forged compressor scroll member, which is obtained by forming an alumina coating having a Vickers hardness of 400 or more on the surface of a forged compressor scroll member made of the aluminum alloy for compressor sliding members according to claim 1 or 2.
7. A forged product of a scroll member for an electric compressor, which is obtained by forming an alumina coating having a Vickers hardness of 400 or more on the surface of a forged product of a scroll member for an electric compressor comprising the aluminum alloy for a compressor sliding member according to claim 1 or 2.
8. A method of manufacturing a forged product of a compressor sliding member, comprising:
a melt forming step of obtaining a melt of an aluminum alloy containing Si: 8.0 to 12.0 mass%, Cu: 0.6 to 1.2 mass%, Mg: 0.2 to 0.8 mass%, Mn: 0.05 to 0.8 mass%, and the balance including Al and inevitable impurities;
a casting step of obtaining a casting material by casting the obtained melt;
a homogenization heat treatment step of performing homogenization heat treatment for maintaining the casting material at 470 to 500 ℃ for 0.5 to 6.0 hours;
a forging step of forging the casting material subjected to the homogenization heat treatment to obtain a forged product;
a solution treatment step of subjecting the wrought product to solution treatment at a temperature of 500 to 545 ℃;
a quenching step of quenching the forged product subjected to the solution treatment; and
and an aging treatment step of heating the quenched forged product at a temperature of 160 to 220 ℃ for 1 to 18 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2018239014A JP2020100863A (en) | 2018-12-21 | 2018-12-21 | Aluminum alloy for compressor slide component, forging product of compressor slide component and production method thereof |
| JP2018-239014 | 2018-12-21 |
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| CN111349827A true CN111349827A (en) | 2020-06-30 |
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| JP (1) | JP2020100863A (en) |
| KR (1) | KR20200078343A (en) |
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| CN112695230A (en) * | 2020-12-21 | 2021-04-23 | 青岛旭源电子有限公司 | High-elongation heat-resistant aluminum alloy vehicle part and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2022072575A (en) * | 2020-10-30 | 2022-05-17 | 昭和電工株式会社 | Aluminum alloy for sliding part and sliding part |
| JP2022072573A (en) * | 2020-10-30 | 2022-05-17 | 昭和電工株式会社 | Aluminum alloy for sliding part and sliding part |
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| CN102482752A (en) * | 2009-07-03 | 2012-05-30 | 昭和电工株式会社 | Process for production of roughly shaped material for engine piston |
| CN103361519A (en) * | 2012-03-30 | 2013-10-23 | 株式会社神户制钢所 | Aluminum alloy forged material for automotive vehicles and production method for the material |
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| JP3261056B2 (en) * | 1997-01-14 | 2002-02-25 | 住友軽金属工業株式会社 | High-strength wear-resistant aluminum alloy extruded material excellent in ease of forming anodized film and uniformity of film thickness and method for producing the same |
| JP4511156B2 (en) * | 2002-11-22 | 2010-07-28 | 昭和電工株式会社 | Aluminum alloy manufacturing method and aluminum alloy, rod-shaped material, sliding part, forged molded product and machined molded product manufactured thereby |
| JP2005281742A (en) | 2004-03-29 | 2005-10-13 | Sanden Corp | Aluminum alloy, scroll part for fluid apparatus made of the aluminum alloy and production method therefor |
| JP4412594B2 (en) * | 2004-05-21 | 2010-02-10 | 昭和電工株式会社 | Aluminum alloy, rod-shaped material, forged molded product, machined molded product, wear-resistant aluminum alloy having excellent anodized film hardness using the same, sliding component, and production method thereof |
| JP6738212B2 (en) * | 2016-06-13 | 2020-08-12 | 昭和電工株式会社 | Aluminum alloy forged product and manufacturing method thereof |
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| JP2010276088A (en) * | 2009-05-27 | 2010-12-09 | Mizuno Tekkosho:Kk | Spool valve |
| CN102482752A (en) * | 2009-07-03 | 2012-05-30 | 昭和电工株式会社 | Process for production of roughly shaped material for engine piston |
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| CN112695230A (en) * | 2020-12-21 | 2021-04-23 | 青岛旭源电子有限公司 | High-elongation heat-resistant aluminum alloy vehicle part and preparation method thereof |
| CN112695230B (en) * | 2020-12-21 | 2022-04-05 | 青岛旭源电子有限公司 | High-elongation heat-resistant aluminum alloy vehicle part and preparation method thereof |
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| DE102019219227A1 (en) | 2020-06-25 |
| JP2020100863A (en) | 2020-07-02 |
| CN111349827B (en) | 2022-07-15 |
| KR20200078343A (en) | 2020-07-01 |
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