JPS60125347A - Sintered al alloy for sliding member - Google Patents

Abstract

PURPOSE:To obtain a lightweight sintered Al alloy for a sliding member having superior wear resistance by specifying the porosity of an Al alloy contg. specified percentages of Cu and Fe, Ni, Cr or Mo. CONSTITUTION:A green compact having a composition consisting of 5-20wt% Cu, 0.2-20wt% one or more kinds of dispersed phase forming components selected among Fe, Ni, Cr, Mo and alloys each consisting of two or more among Fe, Ni, Cr and Mo, and the balance Al with inevitable impurities is formed. The composition may further contain 0.2-20wt% one or more kinds of matrix strengthening components selected among Mn, Mg, Si, Sn and Zn. The compact is sintered in an atmosphere of decomposed gaseous ammonia under prescribed load to obtain a sintered Al alloy having 3-20% porosity. Though the alloy is light in weight, it has superior wear resistance and shows superior performance as a sliding member.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sintered M having excellent wear resistance and particularly suitable for use as sliding members such as cylinders and vane materials.
It concerns alloys.

Conventionally, sliding members used in this type of field have been mainly manufactured from heavy sintered Fθ alloys and sintered Ou gold alloys, but today, as energy saving is avoided,
At present, demands for weight reduction of these members are becoming more and more severe.

Therefore, from the above-mentioned viewpoint, the present inventors focused on M alloy in order to reduce the weight of these sliding members, and as a result of conducting research from the material aspect, we found that %), Ou: 5 to 20%, as dispersed phase forming components: pe, Ni, Or, and Mo.

and one or more of these two or more alloys: 0.2 to 20%, and if necessary, Mn, Mg, Si, Sn, and Zn as base reinforcement components. One or more of the following: 20.2~20φ
, ゛, with the remainder consisting of M and unavoidable impurities,
In addition, in a sintered M alloy having a porosity of 3 to 20%, weight reduction is achieved by the M or M alloy base material, and excellent wear resistance is achieved by the above-mentioned dispersed phase forming components uniformly dispersed in the base material. Because of this, we have found that when used in the manufacture of sliding members, it exhibits excellent performance.

This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below.

(a) The 0u Ou acid component forms a θ phase (M Cu2 compound) to improve the hardness of the substrate and improve the wear resistance of the substrate.
It has the effect of increasing the plastic deformation resistance of the substrate during sliding and preventing the dispersion phase forming components from falling off, but if the content is less than 5 parts, the precipitation of the θ phase is too small and the desired effect is not achieved. On the other hand, if the content exceeds 20%, the amount of θ phase precipitated becomes too large and embrittlement phenomenon appears, so the content was set at 5 to 20%.

(b) Dispersed phase-forming components These components have the effect of uniformly dispersing in the matrix to form a dispersed phase and improving the wear resistance of the alloy due to their own hard properties. If the content is less than 0.2, the desired effect of improving wear resistance can be obtained, whereas if the content exceeds 20, not only will the strength of the alloy decrease, but it will also be difficult to achieve the desired weight reduction. Therefore, the content was determined to be 02 to 20.

(C1 Base Strengthening Components These components have the effect of generating a liquid phase at low temperatures during sintering to improve sinterability, and also strengthen the base by alloying with M, which makes up the entire base. It is included as necessary when strength is required in an alloy, but if the content is less than 0.2 parts, the desired base strengthening effect cannot be obtained, while if it is added in excess of 20 parts, the alloy will The total content was determined to be between 0.2 and 20% since weight reduction would be impaired.

(dl Porosity) Since the sintered M alloy of this invention is mainly used for cylinders and vane materials, it is often used in oil or in an oil-impregnated state. It acts to alleviate the wear of the mating member and also to suppress the temperature rise due to friction of the sliding part. Therefore, if the porosity is less than 34), the desired effect cannot be obtained, and - If the porosity exceeds 20, the alloy strength and wear resistance will drop sharply, so the porosity was set at 3 to 20.

Next, the sintered M alloy of the present invention will be specifically explained using examples.

Example The raw material powder was M powder with a particle size of -200 mesh.

Both are the same 100 mesh atomized iron powder, Fe-
Cr alloy (containing 0% Ornia) powder, Or powder, and Fe-Mo alloy (containing Mo:604) powder, same 35
0mesh N1 powder and Mo powder, both are the same 200mesh All! -(!uu gold powder(
C! u: 30% content).

Mg powder, jV+-Mg alloy powder (Mg: 25% content)
2M-8i alloy powder (sl: 30% content), +M-M
rl gold powder (containing 50% Mn), and /u-Ou-
8i-Mg alloy powder (Ou: 7 parts, Si: 2 parts 1 Mg
:2% content).

Same 150mesh electrolytic cu powder powder amount same 00me
Sn powder and Zn powder of sh were prepared, and subsequently, these raw material powders were respectively blended into the composition shown in Table 1, mixed for 30 minutes in a V-type mixer, and then mixed for 3 to 6 minutes.
The powder compacts are press-formed at a predetermined pressure within the range of ton/cJ, and then these compacts are heated to 500 to 500 ton/cJ with a load of 2 Ks+/ctll added thereto in an ammonia decomposition gas atmosphere. By sintering at a predetermined temperature within the range of 650° C. for 60 minutes, the sintered M alloy 1 of the present invention has substantially the same composition as the blended composition.
~20 and the content of any of the constituent components (first
Comparative sintered M alloys 1 to 8 whose porosity was outside the range of the present invention were manufactured.

Next, the porosity and transverse rupture strength of the resulting sintered M alloys 1 to 20 of the present invention and comparative sintered M alloys 1 to 8 were measured, and the shape of the test piece was determined using a constant speed friction tester. Dimensions: 25 nozzles x 10 m, width: 1 x 21 m deep grooves: 6 equally divided in the direction perpendicular to the friction direction, surface pressure: 5 Kg / ca, friction speed:
15 m/sec, Friction time: 5 hours, Atmosphere;
A friction test was conducted in oil under the conditions of a mating material: quenched and tempered 61 to -5 (hardness: HRO45), and the number of test pieces used: 2 pieces/time, and the wear depth and friction coefficient were measured. These measurement results are also shown in Table 1.

As shown in Table 1, the sintered M alloys 1 to 20 of the present invention have excellent wear resistance and can be used practically as sliding members, whereas the comparative sintered As seen in M Alloys 1 to 8, it is clear that if the content or porosity of any of the constituent components is out of the range of the present invention, the wear resistance will be poor.

As mentioned above, the sintered M alloy of the present invention has excellent wear resistance despite its light weight, so it exhibits excellent performance when used as various sliding members. It is clear that

Applicant: Mitsubishi Metals Corporation Agent Tomi 1) Kazuo and 1 other person ,゛,1

Claims (2)

[Claims] (1) (u: 5 to 20'A. As dispersed phase forming components, Fe, Ni, Or, and Mo. and one or more of these two or more alloys: 0, 2 to 20 1. A sintered M alloy for a sliding member, characterized in that it has a composition (with a weight of 96.9 mm) and a porosity of 3 to 20 mm, with the remainder consisting of M and unavoidable impurities. (2) Ou: 5 to 20, Fe, Ni, Or, and Mo as dispersed phase forming components. and 20.2 to 20% of one or more of these two or more alloys, and further contains Mn, Mg, Si, Sn, as a base reinforcement component.
and one or more of Zn = 0.2 to 20
, and the remainder consists of M and unavoidable impurities (
A sintered M alloy for a sliding member, characterized by having a porosity of 3 to 20%.