JPH07173509A - Wear resistant material, production thereof and compressor using the same material - Google Patents

Abstract

PURPOSE:To produce a wear resistant material reduced in dimensional change of a sliding member and lowering of the hardness even in the case of the rise of the using temp. and excellent in fitness, wear resistance and durability by forming a steadite phase having extremely high hardness between an Fe-based sintered alloy and a Cu-based allay. CONSTITUTION:A metallic structure of primary phases 20 of an F-based sintered alloy obtd. by subjecting a powdery mixture contg. at least two kinds selected from, by weight, 0.2 to 4% Ni, 0.1 to 6% Mo, 0.2 to 8% Cr, 0.5 to 5% Cu, 0.5 to 3% V, 0.3 to 7% W and 0.1 to 1% P and contg. 0.1 to 3% C, and the balance Fe to compacting and thereafter executing sintering, secondary phases 21 with a Cu-based alloy structure in which the pore parts of the same Fe-based sintered alloy are infiltrated with a Cu alloy contg. 0.03 to 3% P or a Cu alloy contg. 0.03 to 3% P and 5 to 15% Sn and steadite phases 22 constituted of a three component eutectic body of Fe-t-P with high hardness and precipitated into a part of the boundary of both is formed. Thus, the wear resistant material withstanding the rise of the using temp. can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant material, a method for producing the same and a compressor using the material, and particularly excellent conformability, wear resistance and seizure resistance, and excellent durability. Abrasion resistant material, manufacturing method thereof and compressor using the material.

[0002]

2. Description of the Related Art In refrigerators, refrigerators, air conditioners and showcases, a compressor for compressing a refrigerant is equipped as a main device. As a compressor generally used in the above application example, there is a hermetic rotary compressor as shown in FIGS. 1 and 2.

In this compressor 1, a casing 2 has a motor 3a, cylinders 8a and 8b, and rollers 10a and 1 inside.
0b, the compression element 3b is internally mounted, and the compression element 3b has a rotary shaft 4 extending from the motor 3a inserted through a main bearing 5 and a sub bearing 6, and a partition plate 7 between the main bearing 5 and the sub bearing 6.
Two cylinders 8a and 8b are disposed through the cylinders 8a and 8b, and cylindrical rollers 10a and 10b are respectively provided in the eccentric portions 9a and 9b formed on the rotary shaft 4 in the cylinders 8a and 8b.
The vanes 11a and 11b are arranged so that the rollers 10a and 10b that are eccentrically rotated as shown in FIG.
The vanes 11a and 11b reciprocate while slidingly contacting the outer peripheral surfaces of the rollers according to the rotations of the eccentric portions 9a and 9b and the rollers 10a and 10b, and serve to partition the insides of the cylinders 8a and 8b by pressure. Thus, the compressor 1 drives the motor 3 to eccentrically rotate the rollers 10a and 10b in the cylinders 8a and 8b, thereby passing through the suction port 12 and sucking the gas sucked into the suction chambers 13a and 13b in the cylinders 8a and 8b. The compression chamber 14
It is compressed while being moved in the a and 14b directions and discharged from the discharge port 15.

In the compressor 1 as described above, the main and auxiliary bearings 5 and 6, the rotary shaft 4, the cylinder 8 and the vanes 11a and 11 are provided.
b. Since the wear of the sliding portions such as the vane and the roller 10 that are in sliding contact with each other becomes particularly remarkable, it is necessary to use a material having high wear resistance.

Conventionally, as a material of this kind, a high-speed steel or a smelting material of eutectic graphite cast iron, and more specifically 2.3%
FC-cast material consisting of Si-3.4% C-balance Fe, SM
A material having improved wear resistance such as SMF-4 type material (iron-carbon-copper alloy) such as F4030 is generally used. Mo-Ni-Cr is a wear-resistant material that constitutes a roller that requires particularly high seizure resistance and wear resistance.
-C-Si-balance Fe alloy (monichrome cast iron) is widely used, and SKH-51 and SUS44 are used as vane materials.
0C, FC200, etc. are generally used as the cylinder material.

[0006]

However, in recent years,
CFCs, which are generally used as refrigerants for refrigerators, refrigerators, air conditioners, etc., have been found to be a cause of environmental damage, and new refrigerants to replace CFCs are being developed.

However, since the operating temperatures of all new refrigerants that are currently in the development stage are significantly higher than those of conventional CFCs, conventional compressors that have sliding parts made of wear-resistant materials have It has been confirmed that various problems occur.

That is, the change of the refrigerant inevitably raises the operating environment temperature, so that the dimensions of the sliding members such as rollers change due to thermal expansion, and the minute clearance between the sliding members expands to compress the refrigerant. There is a problem that the efficiency is lowered and finally the cooling capacity is lowered.

Further, as the operating temperature rises, the hardness and wear resistance of the alloy material constituting the sliding material deteriorates, and the conformability of the sliding material deteriorates, resulting in a performance as a compressor. Has been confirmed to decrease.

The present invention has been made to solve the above-mentioned problems, and even when the operating temperature rises due to the change of the refrigerant, the dimensional change and the hardness decrease of the sliding member constituting the compressor are achieved. An object of the present invention is to provide a wear-resistant material exhibiting stable conformability, wear resistance, and durability, which has a small amount of heat, a manufacturing method thereof, and a compressor using the material.

[0011]

In order to achieve the above-mentioned object, the present inventors have changed the composition of the wear-resistant alloy material constituting the sliding portion of the compressor to change its sliding characteristics. Comparative studies were conducted, and a method for preparing a material capable of forming a stable alloy structure even under high temperature use conditions of each alloy material was studied. As a result, iron (F
e) When a sliding member is formed of an alloy material in which a lubricant phase is formed by impregnating a void portion of the base sintered alloy with a Cu base alloy containing a predetermined amount of P or Sn, under high temperature use conditions. A compressor having good conformability and extremely stable wear resistance and durability was obtained. Further, when a hard steadite phase (third phase) is formed between the Fe-based sintered alloy structure (first phase) and the Cu-based alloy structure (second phase),
In particular, it has been found that a wear-resistant material having improved wear resistance and suitable as a roller material for a compressor can be obtained for the first time.
The present invention has been completed based on the above findings.

That is, the first wear-resistant material according to the present invention comprises, by weight, 0.2 to 4% Ni and 0.1 to 6% M.
o, 0.2-8% Cr, 0.5-5% Cu, 0.5
~ 3% V, 0.3-7% W and 0.1-1% P
At least two elements selected from
% C, balance Fe, and a second phase consisting of 0.03 to 3% P, balance Cu or 0.03 to 3% P, 5 to 15% Sn, balance Cu. And having a third phase made of Fe-C-P on at least a part of the interface between the first phase and the second phase.

The second wear resistant material according to the present invention is
% By weight of 0.2-4% Ni, 0.1-2% Mo,
First phase consisting of 0.1 to 2% C, balance iron, 0.2 to
8% Cr, 0.1-2% Mo, 0.1-2% C,
Second phase consisting of balance Fe, 5 to 15% Sn, balance C
and a third phase consisting of u.

Further, the third wear resistant material according to the present invention comprises 0.2 to 4% by weight of Ni and 0.2 to 8% of C by weight.
a first phase consisting of at least one element selected from r, 0.5-5% Cu, and 0.1-1% P and 0.1-3% C, balance Fe; It is characterized by having a third phase composed of the composite metal of the first phase and the second phase at the interface with the second phase composed of 15% Sn and the balance Cu.

In each of the above wear resistant materials, the volume ratio of the lubricating phase to the wear resistant material, that is, the volume ratio of the pores of the Fe-based sintered alloy may be set to 5 to 25%.

In the first compressor according to the present invention, a rotary shaft that is rotatably supported via a compression element and a bearing, which includes a cylinder and a roller that is in sliding contact with the inner surface of the cylinder, is housed in the casing. In a compressor in which a roller is fitted in the eccentric part of the present invention and the roller is eccentrically rotated in the cylinder with the rotation of the rotary shaft, the roller is the first or second wear resistant material of the present invention. It is characterized by being formed in.

Further, in the second compressor according to the present invention, a rotary shaft rotatably supported via a compression element consisting of a cylinder and a roller in sliding contact with the inner surface of the cylinder and a bearing is internally provided in the casing, and the rotary shaft is provided. In a compressor configured such that a roller is fitted to the eccentric part of the bearing and the roller is eccentrically rotated in the cylinder in accordance with the rotation of the rotating shaft, the bearing and / or the cylinder have the third wear resistance of the present invention. It is characterized by being formed of a material.

The wear resistant material according to the present invention is made of an Fe-based sintered alloy having a relatively high hardness, and
In addition to exhibiting toughness and wear resistance, the lubricating phase composed of a Cu-based alloy exhibits familiarity and seizure resistance as a sliding material. In particular, the wear resistance property is greatly improved by forming a steadite phase having extremely high hardness between the Fe-based sintered alloy structure and the Cu-based alloy structure.

The reasons for limiting the structure and the like of the Fe-based sintered alloy (wear-resistant phase) constituting the wear-resistant material according to the present invention will be described below.

Ni is an element for improving the toughness of the base material and is contained in an amount of 0.2 to 4 wt%. The Ni content is 0.
When the content is less than 2 wt%, the effect of improving the toughness is small, while when the content exceeds 4 wt%, the ratio of the austenite structure remaining in the sintered alloy increases, and the stability and hardness of the material decrease. Will end up.

Cr is an element that improves the wear resistance and corrosion resistance of the material, and is contained in 0.2 to 8 wt%.
If the Cr content is less than 0.2 wt%, the wear resistance and corrosion heat resistance cannot be sufficiently improved, while if the Cr content exceeds 8 wt%, the formability is impaired and Can not get the density of.

Mo is contained in the range of 0.1 to 6 wt% in order to improve the wear resistance, high temperature strength and sliding characteristics of the material. If the amount of Mo added is less than 0.1 wt%, the wear resistance and sliding properties cannot be sufficiently improved, while if the content exceeds 6 wt%, the formability is impaired as with Cr.

Cu is an element that improves the initial sliding characteristics of the material used as the sliding member, and is contained in the material in an amount of 0.5 to 5 wt%. When the Cu content is less than 0.5 wt%, the improvement effect is not sufficient, and on the other hand, it is an element that induces seizure, and especially when the content exceeds 5 wt%, seizure tends to occur. , Its content is 0.5 ~
It is set within the range of 5 wt%.

W is 0.3 to 7 w in order to combine with C to form a high hardness double carbide and improve the wear resistance of the material.
Contains t%. If the W content is less than 0.3 wt%, the effect of improving the wear resistance is not sufficient, and if the W content exceeds 7 wt%, the mating material is worn.

Similar to W, V is contained in the range of 0.5 to 3 wt% in order to form a high hardness carbide and improve the wear resistance of the material. If the V content is less than 0.5 wt%, the wear resistance effect is small, and if the V content exceeds 3 wt%, the wear of the mating material becomes remarkable as in the case of W.

P combines with Cu to form high hardness Cu ₃ P, and combines with Fe to form a high hardness steadite phase (third phase) to improve the wear resistance of the entire material. It is an effective element for the alloy and is contained in the alloy in an amount of 0.1 to 1 wt%. Here, the above-mentioned steadite phase is a ternary eutectic of Fe, P and C and has extremely high hardness, so that the wear resistance of the material can be greatly improved. When the content of P is less than 0.1 wt%, the amount of steadite formed is small and the effect of improving wear resistance is small, while the content of P is 1 or less.
If it exceeds wt%, the strength of the material is significantly reduced.

The P component necessary for forming the above-mentioned stedite phase may be contained in the Fe-based sintered alloy in advance, but it may be contained in the Cu-based alloy used in the infiltration operation described later. You may keep it. Here, by adding P to the Cu-based alloy containing Sn, the Cu base is hardened,
It is possible to form phosphor bronze with good compatibility. The P component has a high rate of remaining in the Cu-based alloy to form phosphor bronze. Therefore, in the case where the P-component is contained in the Cu-based alloy in advance, including the P-component necessary for forming the steadite phase, the content thereof is larger than that in the Fe-based sintered alloy. Is preferably set to a large value of 0.03 to 3 wt%.

C combines with Fe constituting the matrix and various additive elements to form a carbide of high hardness, and
It is an element necessary to generate a steadite phase, and is 0.
1 to 3 wt% is contained.

When the C content is less than 0.1 wt%,
The amount of carbide and steadite phase produced is small and the effect of improving wear resistance is not sufficient.

On the other hand, if the content exceeds 3 wt%, the amount of carbide and steadite phase produced is large, the toughness of the base material is lowered, and the attacking property against the other side during sliding is increased.

Cu or a Cu-based alloy is impregnated into the pores of the Fe-based sintered alloy having the above composition by a usual infiltration method or the like, and the impregnated Cu-based alloy forms a lubricating phase. The lubricating phase composed of this Cu-based alloy is extremely effective in improving the conformability of the material. When P is contained in the Fe-based sintered alloy or Cu-based alloy, C melted in the grain boundary of the Fe-based sintered alloy during the infiltration operation.
u penetrates, the eutectic reaction of P, Fe, and C proceeds, and a high hardness steadite phase composed of a ternary eutectic is dispersed and formed in the grain boundaries. By forming this steadite phase,
The wear resistance of the entire material is significantly improved.

As the Cu-based alloy, Sn is 5 to 1
It is desirable to use bronze containing 5 wt%. Sn
Is alloyed with Cu to become harder bronze, and exhibits the effect of improving the initial sliding characteristics of the material. If the content is less than 5%, there is little improvement effect, and if the content exceeds 15 wt%, a high-hardness δ phase (delta bronze: Cu ₃ Sn ₂ ) precipitates, and the attacking property of Sn increases. Content is 5
It is set within the range of 15 wt%.

Further, the volume ratio of the above-mentioned lubricating phase to the wear resistant material, that is, the volume ratio of the pores of the Fe-based sintered alloy is set to 5 to 25 vol%. When the volume ratio is less than 5 vol%, the ratio of the lubricating phase is relatively decreased, and the effect of improving the material compatibility is reduced, while when the volume ratio exceeds 25 vol%, the ratio of the soft lubricating phase is reduced. It becomes excessively large, and the wear resistance of the entire material decreases.

By the way, in recent years, the compressor is also often operated under severe conditions such that the rotation speed greatly changes due to inverter control, and is formed of a wear resistant material at the moment when the rotation speed suddenly changes. There is also a high risk that the lubrication of the sliding material will deteriorate and seizure will occur. However, the risk of seizure can be greatly reduced by forming the sliding member with a wear-resistant material that forms a lubricating phase like the material of the present application.

The wear resistant material of the present invention exhibiting the above-mentioned various properties is manufactured by the following procedure. That is, first, a predetermined amount of the various element powders and the lubricant are added to iron powder to obtain a mixed powder, and the obtained mixed powder is molded at a pressure of 500 to 70.
After being compressed at 0 MPa to form a molded body having a predetermined shape, the obtained molded body is subjected to a degreasing treatment at a temperature of 500 to 700 ° C. for 1 to 2 hours in a reducing gas atmosphere such as hydrogen or a non-oxidizing gas atmosphere. Further, the degreased molded body was heated at a temperature of 1000 to 12 in a reduced pressure atmosphere or a non-oxidizing gas atmosphere.
It heats at 00 degreeC for 1.5 to 3 hours, and makes it a Fe-based sintered alloy. Furthermore, Cu or Cu is added to the pores of the Fe-based sintered alloy.
Impregnate with base alloy. This impregnation (infiltration) operation is performed according to a normal infiltration method. That is, the melting point of Cu or C when the Fe-based sintered alloy and the Cu-based alloy are in contact with each other.
By heating above the eutectic temperature of the u-based alloy, the Cu-based alloy or the like is infiltrated into the pores to form a lubricating phase and, if necessary, a steadite phase at the grain boundary.

By this infiltration treatment, a lubricating phase composed of a Cu-based alloy is generated in the pores of the matrix structure of the Fe-based sintered alloy.
The volume ratio of the lubricating phase is preferably set to 5 to 25 vol% with respect to the total volume of the wear resistant material. This lubricating phase not only improves the conformability of the material, but also plays a role of sealing the pores of the matrix structure of the Fe-based sintered alloy (sealing function) and imparts pressure resistance (airtightness). By performing this infiltration treatment,
Since the refrigerant gas in the compressor can be prevented from passing through the wear resistant material, the volumetric efficiency of the compressor can be significantly improved.

In the second wear resistant material according to the present invention, since P is not contained as a constituent component, the steadite phase is not formed. However, since it has a Fe-based sintered alloy structure that has high toughness and excellent wear resistance and a lubricating phase that is composed of a Cu-based alloy phase that has excellent compatibility, it has excellent sliding characteristics, and in particular, a compressor It is suitable as a wear resistant material for the roller.

Further, the third wear resistant material according to the present invention does not contain Mo, V, W components and contains hard carbides such as Mo, V, W as compared with the first material. Since it is not formed, the wear resistance of the entire material is slightly reduced, but when used as a sliding material, the opponent attacking property is reduced. Therefore, it is suitable as a material for a cylinder or a bearing that constitutes a compressor.

[0039]

Embodiments Next, one embodiment of a wear resistant material according to the present invention and a compressor using the material for a sliding portion will be described as an example of a rotary compressor having a roller, an auxiliary bearing and a cylinder as a sliding portion. First, the description will be made in comparison with the conventional example.

Examples 1-5 and Comparative Example 1 The rollers used in the compressors of Examples 1-5 were prepared as follows. That is, Fe powder having an average particle size of 145 μm, S
US410L powder, SKD-11 powder, Fe-1Cr-0.
3Mo powder, Fe-2Ni-1Mo powder, average particle size 20 μm
Fe ₃ P powder and graphite powder (graphite) of No. ₃ were weighed in predetermined amounts, and each powder was mixed so that the composition finally shown in the left column of Table 1 was obtained, and 100 parts by weight of this mixed powder was lubricated. 1 part by weight of the agent was added and mixed to prepare 5 kinds of uniform powder mixture.

Next, each mixture is molded at a molding pressure of 600 to 700 MP.
By pressurizing with a, a molded product having an outer diameter of 33 mm, an inner diameter of 23 mm, a height of 15 mm and a molding density of 6.8 to 7.0 g / cm ³ was obtained. Then, each molded body was degreased by heating in a hydrogen gas atmosphere at a temperature of 600 ° C. for 2 hours.

Next, the degreased molded bodies were sintered at a temperature of 1100-1190 ° C. for 2 hours in a depressurized hydrogen gas atmosphere and gradually cooled. And 40-90 at a temperature of 850-950 ° C
After holding for a minute, gas cooling was performed to quench each sintered body. As a result, the density of Fe was 6.6 to 7.0 g / cm ³ .
A base sintered alloy was obtained.

Next, the respective quenched Fe-based sintered alloys were
While being placed on the P-Cu alloy powder or the P-Sn-Cu alloy powder, it is heated to a temperature not lower than the melting point of the Cu alloy to obtain C
By melting the u alloy, the Cu alloy was infiltrated into the pores of the Fe-based sintered alloy to form a lubricating phase having the composition shown in Table 1. Finally, various rollers having a Fe-based sintered alloy phase having a composition as shown in Table 1 and a lubricating phase were prepared.

A test piece was cut out from each roller, and its metal structure was microscopically observed. As shown in FIG.
-Mo-Fe, Cr-Mo-Fe, etc. The structure of the Fe-based sintered alloy 20 composed of high toughness particles, and this Fe-based sintered alloy 20
And a lubricating phase 21 made of a Cu-based alloy filling the pores of
An alloy structure composed of a steudite phase 22 composed of an e-P-C ternary eutectic was observed.

When a Fe-based sintered alloy or a Cu-based alloy containing no P component was used, the steadite phase was not formed.

On the other hand, in order to compare with the above-mentioned sintered alloy roller, as comparative example 1, monichrome cast iron (Fe) which is a conventional material is used.
-0.3Mo-1Ni-1.2Cr-3.2C) melt was used to manufacture rollers having the same dimensions as in Examples 1-5.

Next, as a vane to be used in combination with the above rollers, SUS440C (Fe-17) which is a conventional material is used.
The Cr-1.1C) molten product was subjected to an ion nitriding treatment to manufacture a vane having a predetermined size.

The cylinder is Fe-2.2Si-3.4.
FC200 material having a composition of C was used.

The rollers, vanes and cylinders of Examples 1 to 5 and Comparative Example 1 thus manufactured are mounted on the rotary compressor shown in FIGS. 1 and 2, and high speed operation and low speed operation are repeated at predetermined intervals by inverter control. The condition that the lubrication condition worsens is set, and the refrigerator oil temperature is set to 1
An endurance test was conducted by setting the temperature to 30 ° C. and continuously operating for 3000 hours. Then, the wear amount of each roller outer peripheral portion and the tip of the vane was measured and measured when the operation time reached 3000 hours, and the results shown in Table 1 below were obtained.

[0050]

[Table 1]

As is clear from the results shown in Table 1, in the compressors according to Examples 1 to 5, the roller as the sliding portion is made of a material having excellent wear resistance, lubricity and thermal stability. Therefore, even after operating for a long time under high temperature and severe motion conditions, the wear of the sliding part is smaller than that of the compressor formed of the conventional material shown in Comparative Example 1, and the durability is excellent. have. In particular, galling is less likely to occur in the sliding portion, the inner diameter wear amount of each cylinder is 1 μm or less, and abnormal wear such as seizure does not occur on the inner surface of the cylinder, and the initial sliding characteristics are improved. It was confirmed.

Examples 6 to 10 and Comparative Examples 2 to 3 The Fe-based sintered alloy was infiltrated with the Cu-based alloy in the same procedure as in Examples 1 to 5 to finally have the composition shown in Table 2. Secondary bearings for use in the compressors of Examples 6-10 were prepared.

On the other hand, as comparative examples, FC200 material (Comparative Example 2) and SMF-4 material (Comparative Example 3) were used to prepare auxiliary bearings having the same dimensions. The rotary shaft of the compressor that slides on the various auxiliary bearings was made of FCD600 material.

The sub-bearings and rotary shafts of Examples 6 to 10 and Comparative Examples 2 to 3 thus manufactured were mounted on the rotary compressor shown in FIGS. 1 and 2, and the durability test was conducted in the same manner as in Examples 1 to 5. The measurement was carried out to measure the amount of wear of each sub bearing and the rotating shaft, and the results shown in Table 2 below were obtained.

[0055]

[Table 2]

As is clear from the results shown in Table 2, in the compressors according to Examples 6 to 10, the amount of wear of the sliding portion is the compressor formed of the conventional material shown in Comparative Examples 2 and 3. It was smaller than the above and was found to have excellent durability.

Examples 11 to 15 and Comparative Example 4 An Example 11 having a composition shown in Table 3 was obtained by infiltrating a Cu-based alloy into a Fe-based sintered alloy in the same procedure as in Examples 1 to 5. The cylinders used for ~ 15 compressors were prepared.

On the other hand, as Comparative Example 4, a cylinder of FC200 material having the same size was prepared. The rollers formed in Example 1 were used as the rollers of the compressor sliding on the various cylinders.

The cylinders and vanes of Examples 11 to 15 and Comparative Example 4 thus manufactured were mounted on the rotary compressor shown in FIGS. 1 and 2, and the durability test was carried out in the same manner as in Examples 1 to 5, respectively. The amounts of wear on the side surfaces of the cylinder and the vane were measured, and the results shown in Table 3 below were obtained.

[0060]

[Table 3]

As is clear from the results shown in Table 3, in all the compressors according to Examples 11 to 15, the amount of wear of the sliding portion was higher than that of the compressor formed of the conventional material shown in Comparative Example 4. It became smaller and was found to have excellent durability.

In each of the above-mentioned embodiments, an example in which the wear resistant material of the present invention is applied to the rotary compressor is shown.
The object to be applied is not limited to the rotary compressor, but can be similarly applied to various types of compressors such as a scroll compressor and a reciprocating compressor.

[0063]

As described above, the wear resistant material according to the present invention, the method for producing the same, and the compressor using the material are stable under high temperature conditions as compared with conventional materials. In addition, since the sliding part is made of a material that has excellent wear resistance, lubricity and seizure resistance, it exhibits excellent durability even when operated under severe conditions for a long period of time. Machine can be provided.

In particular, in the material structure of the sliding portion, since the lubricating phase made of the Cu-based alloy having excellent conformability is formed, the opponent attacking property as a sliding material is small and the initial sliding property is excellent. A lifetime compressor can be provided.

In particular, the Fe-based sintered alloy structure (first phase) and Cu
By providing a steadite phase (third phase) having extremely high hardness with a base alloy (second phase), wear resistance characteristics can be significantly improved and a compressor having excellent durability is provided. You can

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a hermetic rotary compressor.

FIG. 2 is a plan sectional view showing a rotor portion of the compressor shown in FIG.

FIG. 3 is a cross-sectional view schematically showing the metallographic structure of the wear resistant material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 compressor 2 casing 3a motor 3b compression element 4 rotating shaft 5 main bearing 6 auxiliary bearing 7 partition plate 8,8a, 8b cylinder 9,9a, 9b eccentric part 10,10a, 10b roller 11,11a, 11b vane 12 Suction port 13a, 13b Suction chamber 14a, 14b Compression chamber 15 Discharge port 20 Fe-based sintered alloy 21 Lubrication phase 22 Steadite phase

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C22C 38/46 F16C 33/12 B 6814-3J

Claims (8)

[Claims] 1. A weight percentage of 0.2 to 4% Ni, 0.1 to
6% Mo, 0.2-8% Cr, 0.5-5% C
u, 0.5-3% V, 0.3-7% W and 0.1
A first phase consisting of at least two elements selected from ~ 1% P and 0.1 to 3% C, balance Fe;
3 to 3% P, balance Cu or 0.03 to 3% P, 5
A second phase consisting of ˜15% Sn and the balance Cu, and Fe—C on at least a part of the interface between the first phase and the second phase.
A wear resistant material, characterized in that it has a third phase consisting of P. 2. A weight percentage of 0.2 to 4% Ni, 0.1 to
6% Mo, 0.2-8% Cr, 0.5-5% C
u, 0.5-3% V, 0.3-7% W and 0.1
A powder mixture of at least two elements selected from ˜1% P, 0.1 to 3% C, and the balance Fe is compacted and sintered to obtain a sintered alloy. ~ 3%
Of P, balance Cu or 0.03 to 3% P, alloy of 5 to 15% Sn and balance Cu is infiltrated. 3. 0.2-4% by weight of Ni, 0.1-0.4%
1% phase consisting of 2% Mo, 0.1-2% C, balance iron, 0.2-8% Cr, 0.1-2% Mo, 0.1
A wear-resistant material, characterized in that it has a second phase consisting of ˜2% C and the balance Fe, and a third phase consisting of 5 to 15% Sn and the balance Cu. 4. A weight percentage of 0.2 to 4% Ni, 0.1 to 4.
2% Mo, 0.2-8% Cr, 0.1-2% C,
Manufacture of a wear-resistant material characterized in that a mixed powder consisting of the balance Fe is molded and then sintered to form a sintered alloy, and an alloy consisting of 5 to 15% Sn and the balance Cu is infiltrated into the sintered alloy. Method. 5. A weight percentage of 0.2 to 4% Ni, 0.2 to
8% Cr, 0.5-5% Cu, and 0.1-1%
At least one element selected from P and 0.1
At the interface between the first phase consisting of ~ 3% C and the balance Fe and the second phase consisting of 5 to 15% Sn and the balance Cu, the third phase consisting of the composite metal of the first phase and the second phase is formed. A wear resistant material characterized by having a phase. 6. Ni to 0.2 to 4% by weight, 0.2 to
8% Cr, 0.5-5% Cu, and 0.1-1%
At least one element selected from P and 0.1
A mixed powder consisting of ˜3% C and the balance Fe is compacted and sintered to form a sintered alloy.
A method for producing a wear-resistant material, which comprises infiltrating an alloy consisting of the balance Cu. 7. A rotary shaft rotatably supported via a compression element and a bearing, which comprises a cylinder and a roller slidingly contacting the inner surface of the cylinder, is housed in a casing, and the roller is fitted to an eccentric part of the rotary shaft. A compressor configured such that the roller eccentrically rotates in the cylinder as the rotary shaft rotates, wherein the roller is formed of the wear-resistant material according to claim 1. 8. A rotary shaft rotatably supported via a compression element and a bearing, which comprises a cylinder and a roller slidingly contacting the inner surface of the cylinder, is housed in a casing, and the roller is fitted to an eccentric part of the rotary shaft. A compressor configured such that the roller rotates eccentrically in the cylinder as the rotary shaft rotates, wherein the bearing and / or the cylinder are provided.
A compressor formed of the wear-resistant material as described above.