JPH06330224A - Lead-impregnated Fe-based sintered alloy sliding members for compressors with excellent wear resistance - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sliding member having excellent wear resistance, which is a structural member of a compressor such as a rotary compressor. [Structure] A sliding member for a compressor is provided with a Mo-Ni alloy, a Mo-Co alloy, and a Mo- as a dispersed phase forming component.
One or more of Ni-Co alloys: 2 to 20% are contained, and all of the following are C: 0.8 to 3 as a base forming component.
%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to
5%, W: 4-15%, and optionally S
i: 0.3 to 1.5%, Co: 0.1 to 15%, Ni:
0.1-2%, Mn: 0.1-2%, Nb: 1-4%,
Ta: 1 to 4%, Ti: 0.5 to 2%, containing at least one kind, and the balance consisting of Fe and inevitable impurities (above weight%), and a porosity of 5 to 20%. It is composed of a lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or a Pb alloy with the Fe-based sintered alloy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-impregnated Fe-based sintered alloy sliding member for a compressor, which exhibits excellent wear resistance even under severe conditions and has extremely low opponent attack. Is.

[0002]

2. Description of the Related Art Conventionally, for manufacturing a compressor sliding member such as a vane member or a roller member which is a structural member of a rotary compressor used in a refrigerator or an air conditioner, and a scroll member of a scroll compressor. It is well known that the Fe-based sintered alloy described in Kaihei 1-188649 and many other Fe-based sintered alloys are used.

[0003]

On the other hand, in recent years, compressors such as rotary compressors and scroll compressors have been remarkably improved in performance and downsized, and along with this, the sliding members, which are these structural members, have become thinner and thinner. Fluorocarbon R134a is becoming more likely to be used as a refrigerant instead of Freon R12, which is required to be compact, and has been forbidden to be used under more severe conditions, and has recently been a cause of ozone layer depletion. However, under such a use environment, the conventional sliding members made of various Fe-based sintered alloys are rapidly worn and reach the service life in a relatively short time.

[0004]

Therefore, the present inventors have
From the above-mentioned viewpoint, as a result of research to develop a sliding member for a compressor having further excellent wear resistance, the sliding member for a compressor was used as a dispersed phase forming component, preferably Ni: 0.1 Mo-Ni with 10% content
Alloy, similarly Mo: Co containing 0.1 to 10% Co, and M containing Ni + Co: 0.1 to 10%
One or more of o-Ni-Co alloys: 2 to
20%, and all of the following as a matrix forming component,
C: 0.8-3%, Cr: 2-16%, Mo:
1-5%, V: 0.4-5%, W: 4-15
%, And if necessary, Si: 0.3-
1.5%, Co: 0.1-15%, Ni: 0.1-2
%, Mn: 0.1 to 2%, Nb: 1 to 4%,
A composition containing one or more of Ta: 1 to 4% and Ti: 0.5 to 2%, and the balance of Fe and unavoidable impurities (the above is% by weight; %) And a porosity of 5 to 20%, and a base material is impregnated with Pb or a Pb alloy in a Fe-based sintered alloy having a martensite structure in which fine carbides are dispersed and precipitated. When composed of a lead-impregnated Fe-based sintered alloy, the resulting sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor exhibits excellent wear resistance when used practically under severe conditions as a structural member of a compressor. We obtained the research results that the opponent's aggression is also low and the excellent performance is exhibited over a long period of time.

The present invention has been made on the basis of the above research results. The sliding member for a compressor is used as a dispersed phase forming component in a Mo-Ni alloy, a Mo-Co alloy, and a Mo-Ni-Co alloy. One or two of the alloys
Species or more: 2 to 20%, and all of the following, as a base forming component, C: 0.8 to 3%, Cr: 2-1
6%, Mo: 1-5%, V: 0.4-5%,
W: 4 to 15%, and if necessary, S
i: 0.3 to 1.5%, Co: 0.1 to 15%, N
i: 0.1 to 2%, Mn: 0.1 to 2%, Nb:
1-4%, Ta: 1-4%, Ti: 0.5-
2%, one or more of them are contained, and the rest has a composition consisting of Fe and unavoidable impurities, and has a porosity of 5 to 20%, and the base has fine carbide dispersed and precipitated. The Fe-based sintered alloy consisting of the martensitic structure
Alternatively, it is characterized in that it is made of a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy.

Next, the reasons for limiting the component composition and porosity of the Fe-based sintered alloy constituting the sliding member for a compressor of the present invention as described above will be explained. (A) Dispersed phase forming components These components are preferably Mo-Ni alloys and Mo containing Ni and / or Co in a proportion of 0.1 to 10%.
-Co alloy and Mo-Ni-Co alloy, which is strongly bonded to the base material by diffusion of Ni and / or Co during sintering into the base material and is dispersed in the base material to improve seizure resistance. Although it has a function of suppressing the progress of wear by enabling smooth operation even under practical conditions under various conditions, if its content is less than 2%, the desired effect cannot be obtained on the above-mentioned function, while its content is 20%. If the content exceeds%, the strength will suddenly decrease, so the content was defined as 2 to 20%.

(B) The C component is a solid solution in the base material to strengthen it, and in addition to forming carbides which are finely precipitated in the base material by heat treatment of quenching and tempering, thereby increasing the hardness of the base material. Therefore, it contributes to the improvement of wear resistance, but its content is 0.8%.
If it is less than the above range, the desired effect cannot be obtained, and if the content exceeds 3%, the toughness is rapidly reduced. Therefore, the content is defined as 0.8 to 3%.

(C) Cr A Cr component is solid-dissolved in the base material to improve the corrosion resistance, and fine carbides having an average particle size of 10 μm or less are formed to improve the hardness of the base material and improve the wear resistance. However, if the content is less than 2%, the desired effect cannot be obtained, whereas if the content exceeds 16%, the aggression against the other party suddenly increases. , Its content was set to 2 to 16%.

(D) Mo The Mo component also forms carbides that are finely dispersed and precipitated in the base material in the same manner as Cr to improve the hardness of the base material, and Cr, Fe, Ni contained in the dispersed phase forming component. , And Co have the effect of promoting diffusion into the base material during sintering and improving the bonding strength to the base material, but their content is 1%.
If it is less than the above range, the desired effect cannot be obtained, and if the content exceeds 5%, the toughness is deteriorated. Therefore, the content is defined as 1 to 5%.

(E) The V V component also has an average particle size of 10 μm, similar to Cr and Mo.
In addition to improving the hardness by forming fine precipitated carbides of m or less, it also has the effect of refining the crystal grains to improve the strength. On the other hand, if the content exceeds 5%, the aggression against the other party will increase, so the content should be 0.4-
It was set at 5%.

(F) In addition to the WW component as a solid solution in the matrix to strengthen it, C
Similar to r, Mo, and V, hardness is improved by forming carbides that are finely precipitated in the martensitic structure of the base material,
It has the effect of improving wear resistance, but its content is 4
If it is less than 0.1%, the desired effect cannot be obtained, while if it exceeds 15%, the toughness is rapidly reduced. Therefore, the content is set to 4 to 15%.

(G) Si Since the Si component has a function of forming a solid solution in the base material and strengthening it, it is contained if necessary, but if the content is less than 0.3%, the desired strength is obtained. The improvement effect cannot be obtained, and on the other hand, if the content exceeds 1.5%, the toughness will decrease, so the content was set to 0.3 to 1.5%.

(H) Co, Ni, and Mn These components have the action of forming a solid solution in the matrix to improve the strength and toughness, so they are contained as necessary, but their contents are In each case, if less than 0.1%, the desired improving effect on the above-mentioned action cannot be obtained, while the contents thereof are Co: 15%, Ni: 2%, and Mn :, respectively.
If it exceeds 2%, the hardness will decrease,
The content of Co: 0.1 to 15%, Ni: 0.1 to 0.1
2% and Mn: 0.1 to 2%.

(I) Nb, Ta, and Ti These components have the function of forming fine precipitated carbides to further increase the hardness of the base material and contribute to the improvement of wear resistance. Content of Nb: less than 1%, Ta: less than 1%, and Ti:
If it is less than 0.5%, the desired effect of improving wear resistance cannot be obtained,
On the other hand, the contents are Nb: 4% and Ta: 4 respectively.
% And Ti: more than 2%, not only the toughness decreases, but also the attacking property of the other party increases, so the contents are Nb: 1 to 4%, Ta: 1 to 4%, and T.
i: 0.5 to 2%.

(J) Porosity If the ratio is less than 5%, lead impregnation is not sufficiently performed,
As a result, not only sufficient airtightness, corrosion resistance, and conformability cannot be ensured, but also the attacking property of the other party appears, while if the ratio exceeds 20%, the wear resistance is sharply reduced. Therefore, the ratio is set to 5 to 20%.

[0016]

EXAMPLES Next, the sliding member for a compressor of the present invention will be specifically described by way of examples. Fe as a raw material powder for forming a water atomized base material having a particle size of 100 mesh or less and having the component composition shown in Tables 1 to 3
Base alloy powders A1 to A28 and B1 to B5, and 10
Having a predetermined average particle size within the range of ˜50 μm, and Table 4
Mo-based alloy powders a to 1 for forming a dispersed phase and a metal Mo powder having the component composition shown in FIG.
Prepare graphite powder below sh and
7. The mixture was blended in the blending composition shown in No. 7, wet mixed in a ball mill for 72 hours, dried, and then press-molded into a green compact at a predetermined pressure within the range of ^{2 to} 7 ton / cm ² . Sintering in vacuum at a predetermined temperature within the range of 1170 to 1220 ° C. for 1.5 hours, followed by 1150 to 1
Quenching by forced gas cooling from a predetermined temperature in the range of 210 ° C. and heat treatment of tempering for 2 hours at a predetermined temperature in the range of 500 to 600 ° C. are repeated twice, and the martensite matrix has an average particle size of 10 μm. By uniformly depositing the following fine carbides, the composition is substantially the same as the composition and the porosities shown in Tables 5 to 7, respectively, and the width is 20 mm and the length is 20 mm. 17 mm × thickness: a rectangular plate-shaped sintered body having a thickness of 4 mm, and then, with one end surface in the longitudinal direction in contact with the roller piston as a mating member on the sintered body being a curved surface of R4, the same as in Table 5
8Kg on the bath surface in a nitrogen atmosphere with the combinations shown in
/ Cm ² pressure applied: 500 ℃ pure lead or P
b-5% Sn made of a lead-impregnated Fe-based sintered alloy as a sliding member which is a structural member of a rotary compressor by impregnating lead in a bath of Pb alloy having a composition of 5% Sn for 1 hour. Vane members (hereinafter referred to as lead impregnated sintered vane members of the present invention) 1 to 28 were manufactured. Further, for the purpose of comparison, the vane member is described in the above-mentioned JP-A-1-18.
No. 8649, the composition corresponding to the Fe-based sintered alloy, that is, the Fe-based sintered alloy having the composition shown in Table 7, and the same conditions except that the lead impregnation is not performed. Then, conventional Fe-based sintered alloy vane members (hereinafter referred to as conventional sintered vane members) 1 to 5 were manufactured.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

[Table 3]

[0020]

[Table 4]

[0021]

[Table 5]

[0022]

[Table 6]

[0023]

[Table 7]

Next, the lead-impregnated sintered vane members 1-28 of the present invention and the conventional sintered vane members 1-5 obtained as a result are obtained.
The dimensions of the compression chamber: inner diameter 41 mm x width 20 mm, roller piston material: heat treated material of FC300, roller piston dimensions: outer diameter 32 mm x width 20 mm, built into the rotary compressor, refrigerant used: Freon 134a, roller piston The pressing force was 22 kgf, the rotation number of the roller piston was 1000 rpm, and the test time was 800 hours.
The results of these measurements are shown in Tables 5 to 7 together with the maximum wear depth of the roller piston which is the counterpart member.

[0025]

From the results shown in Tables 5 to 7, the lead-impregnated sintered vane members 1 to 28 of the present invention are all superior to the conventional sintered vane members 1 to 5 in a severe corrosive environment. It is clear that it exhibits abrasion resistance and its opponent attacking property is extremely low. As described above, the lead-impregnated Fe-based sintered alloy sliding member for a compressor according to the present invention has excellent wear resistance while maintaining extremely low opponent attack property even in practical use under severe conditions. It can be fully utilized to reduce the size and weight of compressors such as rotary compressors and scroll compressors, as well as to improve their performance.

Claims (8)

[Claims] 1. A dispersed phase forming component contains one or more of Mo—Ni alloys, Mo—Co alloys, and Mo—Ni—Co alloys: 2 to 20%, both of which are included below. As a base forming component, C: 0.8 to 3%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to 5%, W: 4 to 15%, and the balance is A Fe-based sintered alloy having a composition of Fe and unavoidable impurities (above wt%), a porosity of 5 to 20%, and a base material having a martensite structure in which fine carbides are dispersed and precipitated, Pb Alternatively, a sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which has excellent wear resistance, is constituted by a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy. 2. One or more of Mo-Ni alloys, Mo-Co alloys, and Mo-Ni-Co alloys as a dispersed phase forming component: 2 to 20%, and any of the following: Also, as a base forming component, C: 0.8 to 3%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to 5%, W: 4 to 15%, and , Si: 0.3 to 1.5%, the balance of which is composed of Fe and inevitable impurities (above weight%), and a porosity of 5 to 20%, and the base is fine. Lead for a compressor having excellent wear resistance, characterized in that it is made of a lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or a Pb alloy with an Fe-based sintered alloy having a martensite structure in which carbides are dispersed and precipitated. Sliding member made of impregnated Fe-based sintered alloy. 3. The dispersed phase forming component contains one or more of Mo—Ni alloy, Mo—Co alloy, and Mo—Ni—Co alloy: 2 to 20%, both of which are included below. As a base forming component, C: 0.8 to 3%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to 5%, W: 4 to 15%, and further, Co: 0.1 to 15%, Ni: 0.1 to 2%, Mn: 0.1 to 2%, and one or more of them, and the balance consisting of Fe and inevitable impurities. (Above wt%), and 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured. 4. One or more of Mo-Ni alloys, Mo-Co alloys, and Mo-Ni-Co alloys as a dispersed phase forming component: 2 to 20%, both of which are included below. As a base forming component, C: 0.8 to 3%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to 5%, W: 4 to 15%, and further, Composition containing Nb: 1 to 4%, Ta: 1 to 4%, Ti: 0.5 to 2%, and one or more of the following, with the balance consisting of Fe and unavoidable impurities (above weight% ), And 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured. 5. The dispersion phase-forming component contains one or more of Mo—Ni alloys, Mo—Co alloys, and Mo—Ni—Co alloys: 2 to 20%, both of which are included below. As a base forming component, C: 0.8-3%, Cr: 2-16%, Mo: 1-5%, V: 0.4-5%, W: 4-15%, Si: 0.3- 1.5%, and further contains one or more of Co: 0.1 to 15%, Ni: 0.1 to 2%, and Mn: 0.1 to 2%. However, the balance is composed of Fe and inevitable impurities (above wt%), and 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured. 6. The dispersion phase-forming component contains one or more of a Mo—Ni alloy, a Mo—Co alloy, and a Mo—Ni—Co alloy: 2 to 20%, both of which are included below. As a base forming component, C: 0.8-3%, Cr: 2-16%, Mo: 1-5%, V: 0.4-5%, W: 4-15%, Si: 0.3- 1% or more of Nb: 1 to 4%, Ta: 1 to 4%, Ti: 0.5 to 2%, and the balance is Composition consisting of Fe and unavoidable impurities (above wt%), and 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured. 7. The dispersion phase-forming component contains one or more of a Mo—Ni alloy, a Mo—Co alloy, and a Mo—Ni—Co alloy: 2 to 20%, both of which are included below. As a base forming component, C: 0.8 to 3%, Cr: 2 to 16%, Mo: 1 to 5%, V: 0.4 to 5%, W: 4 to 15%, and further, Co: 0.1 to 15%, Ni: 0.1 to 2%, Mn: 0.1 to 2%, and one or more of: Nb: 1 to 4%, Ta: 1 to 4 %, Ti: 0.5 to 2%, one or more of them, and the balance consisting of Fe and unavoidable impurities (more than wt%), and 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured. 8. The dispersion phase-forming component contains one or more of a Mo—Ni alloy, a Mo—Co alloy, and a Mo—Ni—Co alloy: 2 to 20%, both of which are included below. As a base forming component, C: 0.8-3%, Cr: 2-16%, Mo: 1-5%, V: 0.4-5%, W: 4-15%, Si: 0.3- 1.5%, and further, one or more of Co: 0.1 to 15%, Ni: 0.1 to 2%, Mn: 0.1 to 2%, and Nb. : 1 to 4%, Ta: 1 to 4%, Ti: 0.5 to 2%, and one or more of them, and the balance consisting of Fe and unavoidable impurities (more than wt%) , And 5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy into an Fe-based sintered alloy having a porosity of 20% and a base material having a martensite structure in which fine carbides are dispersed and precipitated. A sliding member made of a lead-impregnated Fe-based sintered alloy for a compressor, which is excellent in wear resistance and is configured.