JPH0257653A - Al-sn bearing alloy - Google Patents

Abstract

PURPOSE:To obtain the title alloy having excellent fatigue resistance, seizure resistance and wear resistance by incorporating specific amounts of Pb and Si into an Al-Sn bearing alloy adding specific small amounts of Sb thereto and depositing Si grains in a spherical or almost spherical shape into an Al matrix. CONSTITUTION:As an Al-Sn bearing alloy, by weight, 0.01 to 0.1% Sb is added to a bearing alloy contg. 7 to 20% Sn, 0.1 to 5% Pb and 1 to 10% Si, contg. 0.3 to 3.0% independent Zn or 0.3 to 3.0% total of Zn, Cu and Mg, furthermore contg. 0.01 to 0.1% total of one or more kinds among Cr, Mn, Fe, Ni, Co, Ti, V and Zr as deposition hardening-type matrix strengthening elements and the balance Al. An Sn-Pb alloy 3 is deposited into an Al matrix 1 adjacently to spherical Si grains therein, by which the Al-Sn bearing alloy having drastically improved lubricity can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an Al-Sn bearing alloy, and more specifically, 81 particles are precipitated in a matrix in the shape of one sphere or a shape close to it, and moreover, it is suitable for high-speed and high-load applications. It is possible to operate the An! -Relating to Sn-based bearing alloys.

Conventional technology Recently, automobile engines have become smaller, more fuel efficient, and have higher output.As a result, the load on the bearings has increased, the temperature of the lubricating oil has also increased, and the operating conditions for the bearings have changed. It is becoming more and more severe. From this point of view, in conventional multi-component systems, All-all systems, etc., a surface layer of Pb-Sn system, etc. is formed on the surface of the bearing base metal by overlay plating, etc., but in bearings with this structure, the lubricating surface is Due to high temperatures, fatigue and seizure phenomena occur, making it difficult to withstand the harsh operating conditions mentioned above.Recently, there has been a demand for bearings that do not have a surface layer formed by overlay plating, etc. Currently, even bearings such as these cannot necessarily exhibit stable performance under the above-mentioned severe operating conditions.

In other words, bearings with overlay scratches on their surfaces generally meet JIS H5402, AJ-1 (10%
Sr+, 0.15%Cu, 0.5%Ni, AlBa/l
, JIS H5402, AJ-2 (6% Sn, 2.5
JIS standards such as %CU, 1.0%N1, AjBaJ),
SAE 780 (6% sn, 2% Si.1% Cu, 0.
As shown in SAE standards such as 5% Ni, 0.1%■1, A/Ba1), the bearing base metal part is made of low 5n-Al with a relatively low sn content! An overlay plating layer of a Pb-Sn alloy is formed on the bearing surfaces of these bearing alloy parts.

However, in recent years, under the high load and high temperature operating conditions, these bearings have an overlay plating layer on their surface! It has deteriorated to the point of burn-in and is no longer usable. On the other hand, bearings that do not have an overlay plating layer formed on their surfaces have S
AE 7g3 (20% Sn.

0.5% Si. 1.0%Cu%0.1%■1, lBa/
As shown in Figure 1, it is made of a high 5n-AX alloy with a high Sn@ content. However, such an alloy containing as much as 20% Sn has low hardness (and the Ag matrix becomes weak, so it cannot withstand high loads).

In addition, regardless of the SNN content, a bearing base metal with PB added to the AX-Sn alloy to improve lubricity and seizure resistance has been developed, for example, by Akira Mizuno, Nikkan Kogyo Shimbun, 1950. This bearing base metal is made of Al-Sn-P containing 10% Sn, 1.5% Cu, 0.5% Si, and added with 3% PB.
It is a b-based alloy.

Further, since this l-5n-Pb alloy hardly forms a solid solution with Pb1l, in order to improve the dispersibility of this Pb, an AX-Sn-PbSb-based alloy containing Sb was developed as 121Si and further added cr to strengthen the Al matrix.
A b-3b-Cr alloy is described in Japanese Patent Publication No. 18985/1985. However, these 81-Sn-Pb alloys were developed for the purpose of improving lubricity during normal operation, and have the drawback of not exhibiting sufficient fatigue resistance under high-load operating conditions.

The reason for this is that the lubrication mechanism between the shaft and bearing under high load operation is fundamentally different from that under normal operation.

Therefore, a basic study was conducted on the lubrication mechanism under high load operation, and one of the studies was published in JP-A-58-6433, in which coarse Sl was dispersed and precipitated in an AJ-sn alloy.
It is proposed by No. 6.

This bearing has a cutting force made of hard Si precipitates, and because it has the cutting force, the unevenness on the surface of the mating shaft is shaved off and flattened, improving the bearing performance.

To explain in more detail, on the surface of the mating shaft made of graphite cast iron on which spherical or flaky graphite has been precipitated, recesses remain after graphite particles that have fallen off during polishing, and around these recesses there is hardened (work-hardened) material. Convex portions such as edges and edges are generated.Therefore, as shown above, 1-Sn system, Al-Sn
- In a bearing base metal made of Pb or the like, abnormal wear is likely to occur during high-load operation due to these uneven portions. On the other hand, in the case of the bearing base metal in which the coarse Sl is dispersed and precipitated, the cutting force is applied by the hard Sl precipitates, so the uneven parts of the mating shaft are mechanically cut and flattened. , therefore,
No abnormal wear or seizure occurs.

However, if the mating shaft is made of a material other than graphite cast iron, during high-load operation, the surface of the mating shaft will be irregularly scratched by coarse S precipitates, causing seizure and causing major problems.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks. Specifically, in the conventional Al-Sn bearing base metal, S is used to improve lubricity.
Elements such as Cr, Sb, etc. and Mn%N1 have been added to increase the content of n and pb, and to further strengthen the Al matrix, but these elements do not increase the hardness of the Al matrix. However, it was found that the Af gold alloy becomes brittle and exhibits almost no fatigue resistance at high temperatures (100~b) during high-load operation.Therefore, Si is precipitated into the alloy in a nearly spherical shape. The purpose is to solve the problems of seizure resistance and wear resistance.

Therefore, the present invention has been developed in view of the fact that the temperature of the bearing part tends to rise with the recent increase in the output of engines, and in particular, there is a strong demand for fatigue resistance at this high temperature.
Despite the addition of matrix-strengthening elements, Al-5n bearings improve the embrittlement of alloy 1 and improve fatigue resistance, especially at high temperatures, as well as providing unprecedented seizure resistance and wear resistance. Provide alloys.

Means for solving the problem and its operation, the present invention provides 1 to 20% 5O50,1 by weight%.
~5% Pb, 1-10% Si and CLI, M(1,
One or more types of Kanoura in total 0.3 to 3.0
%, as well as Cr, Mn, Fe, Ni, Go,
In an AJ-Sn bearing alloy containing one or more of Ti, V, and Zr in a total of 0.01 to 1.0%, and the remainder substantially consisting of Al, 0.01 to 0.1
% of Sb is added to disperse and precipitate Si particles in the A/matrix in the form of a sphere, an ellipse, or a shape with a rounded tip.

A more detailed explanation of the configuration of these means and their operation will be as follows.

First, the present invention was made to improve fatigue resistance under high temperature conditions.

That is, in the conventional example, C, which is simply a high melting point element,
r%C01N1 etc. are added to increase high temperature strength, prevent sudden decrease in hardness at high temperatures, and improve wear resistance. However, like this 1. l! - If high melting point elements are simply added to improve the fatigue resistance of Sn-based alloys at high temperatures, the hardness will increase, but the alloy will become brittle and the tensile strength, elongation, and impact value will decrease. No effective means have been found to increase the fatigue resistance of the base metal.

On the other hand, the present invention is suitable for use under high temperature and high load conditions.

The present invention provides a bearing base metal suitable for severe conditions. First, in the present invention, Sb is added as an essential component, and this Sb is replaced with Si.
is applied to make the Si crystal spheroidal from the time of casting, and furthermore, the spheroidization of the Si crystal is increased by heat treatment, thereby increasing the tensile strength, elongation, and impact strength of the Al-Sn alloy.

In other words, it is generally said that fatigue strength is a result of the material's tensile strength, elongation, impact strength, structural structure, etc., and cannot be solved simply by adding bearing components. . Regarding this point, the inventors of the present invention have conducted extensive research and discovered such an effect of Sb, and the present invention has been accomplished based on this knowledge. Furthermore, even if the above-mentioned (high melting point element) is added to the Al-Sn alloy as an additive element, the addition of Sb can prevent the mechanical properties from deteriorating. There is no sudden deterioration in properties.This feature of the present invention can be supported by the fact that an improvement in fatigue strength was observed as a result of fatigue tests conducted at high temperatures and under high loads.

Furthermore, the present invention is suitable for high temperature and high load conditions in terms of the surface structure, thereby significantly improving surface performance.

Generally, it is said that it is difficult to understand the burn-in phenomenon unambiguously because the process of reaching it is complex and many conditions act synergistically to achieve it. However, PB on the surface
- Cu with overlay plating layer of sn alloy formed -
PB-based shaft bearing alloys Under high-load operation, this plating layer wears out, leading to seizure, whereas bearings made of Al-Sn-Pb-based alloys containing Sl, Cu, etc., have an overlay plating formed on the surface. There is a phenomenon that does not lead to burn-in even though it is not done.

Therefore, the present inventors paid attention to this phenomenon and conducted a structural comparative study of both bearings. That is, FIG. 3 is an enlarged cross-sectional view of a part of a bearing having an overlay surface.
FIG. 4 is an enlarged sectional view of a portion of a bearing made of 11-5npb alloy, which has no overlay plating on the surface and contains Si, CI, etc. As is clear from FIG. 3, this bearing has an overlay plating layer 4 on the surface. L! ! !
5 and a back metal 6, and the axial load is supported by the entire surface of this overlay plating l14. On the other hand, as shown in Fig. 4, 81
, Cu, etc. are alloy I! Consisting of I5 and backing metal 6, rod-shaped S pieces are formed in the matrix of this alloy 1i5.
i particles 2 are precipitated. Therefore, in this bearing, the load of the mating shaft is supported by the hard 81 particles 2, and moreover, the Si particles have the cutting force as described above.

In short, the difference between the two is surface contact and point contact, and this difference makes a decisive difference in lubrication and temperature rise on the 111 surface. In other words, in surface contact, as in the bearing shown in Figure 3, the temperature of the friction surface rises rapidly under high speed and high load conditions, whereas in point contact, as in the bearing shown in Figure 4, the temperature of the friction surface increases rapidly under high speed and high load conditions. A gap is formed between the surface of the layer 50 and the surface of the mating shaft, and since a very large load is not applied to the 'a film in this gap, sufficient lubrication is maintained and temperature rise on the friction surface is suppressed.

Proceeding further, the present inventors have taken the basic viewpoint that supporting the shaft load by point contact as shown in FIG. After researching the composition and structure to make the best use of this technology, they were able to complete the bearing base metal according to the present invention.

Specifically, the present inventors focused on the form of Si precipitation in the bearing base metal, which is an A/-Sn-Pb alloy and includes Si or CU, and investigated the effect of this form on the lubricating surface. As we proceeded with our research, we found that, firstly, Sl is a stable substance with a high melting point, and has strong nonmetallic properties, so that Fe, the main component of the mating shaft,
The point support means for the axial load is Sl
was found to be extremely suitable.

Secondly, when the mating shaft is point-supported through an oil film, the 81 particles are so hard that their Vickers hardness reaches 599.However, since the 81 particles are not a compound, they are not brittle, have high elasticity, and suddenly harden. It was found that it can withstand a large amount of fluctuating load.

However, although Si has the properties described above, it has strong crystallinity (even in the form of eutectic precipitation with Al,
It has a plate-like or rod-like shape, and its shape changes only slightly during rolling and heat treatment during the bearing manufacturing process. Therefore, if the precipitation form of Si particles is not controlled, as shown in FIG.
The Si particles 2 precipitated together with the pb alloy particles are plate-shaped or rod-shaped, and the Sn--Pb alloy particles 3 are present 81 particles 2 apart. In this state, the edges of the hard Si particles 2 cannot scrape the mating shaft and are likely to attach, and on the contrary, the lubricity is reduced and seizure occurs.

From this point of view, in the present invention, in order to dramatically improve the lubricity, the cutting force is removed from the 81 particles, and the shape is controlled so that the edges are rounded, such as spherical.

That is, FIG. 1 is an enlarged sectional view of a part of a bearing base metal according to one embodiment of the present invention, and as shown in FIG. S to do
The i-particles 2 are spherical, and the spherical Si particles 2 bring the ideal point contact closer to the ideal point contact, further increasing lubricity and wear resistance. Furthermore, even if a high load is suddenly applied at high speed, the mating shaft will not be damaged. Also, Sl
Since it is spherical, there is no notch effect in the matrix, and a matrix with stable strength can be obtained, and it also has excellent wear resistance.

This spheroidization of Si particles is caused by Al at the eutectic point where Si precipitates.
This can be achieved by improving the properties of the @gold liquid phase, and 5bIf is particularly effective as an additive element.

Furthermore, when Si) is added, the precipitation shape g of the 5n-Pb alloy particles 3 changes, and as shown in FIG. become. This structure is that of a conventional example (for example, see Figure 5).
Dramatically improves lubrication performance compared to

In addition to solving the surface performance in principle as described above,
It is necessary to strengthen the matrix at high temperatures.

That is, Al is highly sensitive to heat, and if the temperature exceeds 150° C., it becomes soft (below 11 vlo) and loses its strength. In order to prevent this softening, precipitation hardening type 7 trix strengthening elements such as Or%Mn,
Adding Fe%Go, ~1, T1, V, Zr, etc., and selecting l1lj or two or more of these reinforcing elements, ``Appropriate heat treatment will further increase the strength at high temperatures. be able to.

As described above, in the present invention, in addition to adding elements to strengthen the base as in the past, Sb is added together with these reinforcing elements to improve not only the hardness but also the tensile strength and elongation compared to the past. The purpose is to increase fatigue resistance and improve bearing performance under high load operation.The R structure and the composition of each component are explained as follows.

In the bearing with the configuration shown in Fig. 1, the lubricating surface that supports the shaft load is the tip of the 81 particles 2 protruding from the surface of the matrix 1, and the 'a film is interposed between the 81 particles and the mating shaft. , fluid lubrication is maintained. However, this oil film ruptures when subjected to a rapidly fluctuating load, reaching local boundary lubrication.
If the F lume is present, seizure can be prevented, and moreover, the 'a film can be normally regenerated and the state of fluid lubrication can be quickly restored. At this time as well, with the structure shown in Fig. 1, Sn-pb alloy particles 3 are present near the Si particles 2, and this alloy has an affinity for lubricating oil even in the molten state, so it is possible to drain the oil. Hard to cause. Also, the mating shaft and 8
In the R source with 1 particle, even if the Si particle becomes high temperature, 5i-
Heat is absorbed by the heat of fusion of Pb, and the nearby 7-trix Al
Seizure between the alloy and the mating shaft is less likely to occur. Also, at this time, as shown in FIG. 2, the Sn adjacent to the Si particles 2
At least a portion of the -Pb alloy particles 3 are in a liquid phase, and this liquid phase 3a is supplied to the protruding surfaces of the 81 particles 2. As the temperature increases, this supply amount increases by 5 to 81 particles to 2.
Since the 5n-Pb liquid phase 3a is always present on the lubricated surface, overheating 1 can be prevented. In short, 81
The structure in which the particles 2 are spherical and the 5n-Pb combined particles 3 are adjacent to them is very effective in boundary lubrication conditions (oil film has broken), and even in normal fluid lubrication conditions, the hard 51 particles 2 5n- which fits properly into the mating shaft and is soft
It is covered with a PB layer, which acts like a shock absorber.

Historically, in order to obtain an excellent lubricating surface, 81 particles or Sn −
A strong matrix is required to support the Pb alloy particles. Namely, the above! The reasons for the limitations as described in the claims and their effects (including synergistic effects) will be listed for each element.

(1) 7 to 20% Sn: Sn exists dispersed in the Al matrix together with PB, and is a metal that provides the seizure resistance, embeddability, and conformability that bearings basically require. If it is less than 1%, the anti-seizure effect cannot be obtained, and if it is more than 20%, the Sn phase becomes three-dimensionally continuous, impairing the strength.

(2) Pb O, 1 to 5%: Pb coexists with the above SO and makes the anti-seizure, embedding, and conformability abilities of Sn more effective, and has excellent lipophilicity and non-adhesive properties. , dramatically improves lubrication performance even with a small amount of deep hole. If the mold is less than 0.1%, it will not be able to exhibit the above effect, and if it is more than 5%, it will substantially coexist with sn in the Al matrix, making it virtually impossible to uniformly disperse it.

(SiSi 1 to 10%: An important element that provides anti-seizure properties, load resistance, and wear resistance to Al bearings. If it is less than 1%, no effect is observed;
% or more, the alloy becomes hard and loses ductility, which actually impairs load-bearing properties.

(A total of 0.3 to 3% of one or more of 410u, Mg, and In: Cu, Mg, and 10 are basic elements that strengthen the Al matrix, and their effects can be enhanced by applying appropriate heat treatment. If the amount is less than 0.3%, no effect is seen, and
If it exceeds 3%, it will form a compound with Al, which will actually impede the ductility of the material.

(510r%Mn, Fe, Ni, C01Ti, v
, a total of 0.01 of one or two or more of Zr
~1.0%: All of these elements are elements that easily form compounds, and adding a small amount can increase hardness and strength by 7 trix. In particular, when added in an appropriate amount, it is effective in improving fatigue resistance, wear resistance, and maintaining strength at high temperatures. Additional disease is 0.
If it is less than 0.01%, there is no effect, and if it is more than 1%, the compound becomes coarse and the alloy strength is reduced.

+6) St) 0.01 to 0.1%: Sb has the effect of dispersing and precipitating Si particles into a spherical, elliptical, or rounded tip shape. In order to have this effect, it is most preferable to add 0.01 to 0.1%, and 0.0
If it is less than 1%, it does not affect the shape of Si particles, and if it is less than 0.
Even if it is added in an amount of 1% or more, it will precipitate inside the sn phase and will not be useful for improving the 51 grains.

Example Next, examples of the present invention will be described.

Example 1 First, an Al-Sn bearing base metal having the composition shown in Table 1 was continuously cast as a plate material with a thickness of 20 ms, and the upper and lower surfaces of each cast billet were ground by 1.0 mm. Subsequently, it was reduced to a thickness of 2 mm by cold rolling.

In this state, a heat treatment was performed at 300 to 350° C. to remove strain, and then the bearing was crimped to a steel backing plate through a thin plate of ll[iAJ to obtain a bearing with a thickness of 1.50 m.

Among these bearings, test materials Ni 1 to 5 are conventional test materials, and 1 to 6 to 20 are those according to the present invention, among which Ns and 6 to 12 are Si spheroidized. Sb was added for the purpose of addition, CU was added for the 7-trix addition, and other
Add r, Mn, Fe, Go%Ni, respectively,
Sample materials &13 to 20, in which a small amount of Ti was added for grain refinement, were added in appropriate combinations of the above additive elements.

Each of these test materials was used as a bearing at normal temperature and
To examine the mechanical properties at 00°C, tensile strength, elongation and hardness tests were carried out and are shown in Table 2. In addition, the backing metal of each sample material was removed by machining and made into Al-5.
Only the n alloy part is used, and the shape of the test piece is Moon S z 220.
1, No. 5.

From these results, compared to conventional materials, specimens 6 to 20 showed less strength loss at high temperatures (200°C), CLI,
MQ, Zn and Cr, Mn, Fe, Go, Ni,
The A-adding effects of Ti, V, and Zr can be clearly seen. That is,
It is thought that the strength and elongation were improved due to the phase opening of Sl spheroidization and matrix reinforcement. Furthermore, the elongation was improved compared to the conventional example, and it can be said that the overall mechanical properties at high temperatures were improved.

Next, in order to find out the seizure resistance and abrasion resistance of the sample materials, a test was conducted using a Suzuki Ni-ahara abrasion tester, and the test conditions were as follows.

Massage speed 4m1sec Mating material 345G, hardness H, C-55 Surface roughness 0.8 1. O8 Oil used SAE, 20w-40'a temperature
150±5℃ Seizure load 100ktJ/CF' to 10klJ/13
Wear resistance: Increase the surface pressure every 15 minutes until seizure occurs in 2 steps, and use the surface pressure at which seizure occurs as the seizure load.On the other hand, to check the wear resistance, we applied 100kq/I.
] 2 The test was carried out at a constant temperature for 6 hours, and the results of the subsequent weight change are shown in Table 2.

According to this, all of test materials 6 to 20 exhibit better seizure resistance and wear resistance than conventional materials, and it can be seen that the addition of Sb and matrix-strengthening elements also improves surface performance. . This indicates that the alloy according to the present invention has an excellent lubrication mechanism.

Next, we actually machined each sample material into a bearing shape and conducted the most lethal bearing fatigue test of 1':i, and the results shown in Table 2 were 1q. This test was carried out under the following conditions, with the bearing fixed to the connecting rod and an eccentric load applied to the shaft, almost the same as in an actual engine. This is a test that evaluates the length of time spent.

Note that the test conditions are as follows.

Surface pressure 800kgf/c 12 rotations
Number 400Cr, p, 1 Mating material FC lower 0, roughness 0.8~1.5S Oil used SAE 2
0v-40 Oil i 150°C + 5"C Note that the upper limit of this original strike time is 300 hours, and the average value of N = 5 is shown in Table 2. As a result, both are longer than the conventional material of the comparative example. The durability time is shown, and the alloy according to the present invention has excellent fatigue resistance.
6 and 7 show the changes in the morphology of Sl in the case of adding 0.3% (sample material N17). That is, FIGS. 6 and 7 are explanatory diagrams showing the microscopic structures of the conventional alloy and the alloy according to the present invention. In particular, each sample was deeply etched so that the shapes of eight grains could be seen, This photo was taken using an electron microscope. As can be clearly seen from these drawings, in contrast to the conventional example where the particles 2 are not spherical at all as shown in FIG.
It can be seen that in the present invention, the edge portions of 81 particles 2 are spherical due to the addition of Sb.

Example 2 In order to confirm whether or not the bearing base metal according to the present invention has the effect of improving the brittleness of the alloy by adding a high melting point metal etc. as a reinforcing agent to the Al matrix, the impact value was measured as a substitute property. was measured, and the improvement effect due to the addition of Sb was determined through experiments.

As test materials for the experiment, the conventional material No. 5, which does not contain Sb, and the material No. 5 according to the present invention shown in Table 1 of Example 1 were used.
, 20, a comparative experiment was conducted.

The experiment was conducted using No. 3 test pieces (n=5) prepared according to JIS Z 2242 and the Charpy impact test method.

As a result of the experiment, the average II of the conventional material was 0.84k [J・m,/r
f, but the one according to the present invention has an average [3,20 kq
-MCI2, and the bearing base metal according to the present invention clearly showed an improvement effect by adding 5bH1.

<Effects of the Invention> As explained in detail above, the present invention achieves the
0%5O10, 1~5%l1l), 1~10%Si and one or more of Cu, Mg, and Zn in an amount of 0.3~3.0%, as well as Cr, Mn,
In an AX-3ri bearing alloy containing one or more of Fe, N+, GO1■1, V, and Zr in an amount of 0.01 to 1.0%, the balance is substantially Al. Aj? by adding .01 to 0.1% Sb? It is made by dispersing and precipitating Si particles in a matrix in a spherical, elliptical, or rounded tip shape, and the bearing alloy of the present invention with this structure has extremely excellent lubricity and can withstand temperatures of 100 to 250°C. This bearing base metal has extremely good mechanical properties at high temperatures and can fully withstand the harsh conditions of use caused by high-load operation.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a part of a bearing base metal according to one embodiment of the present invention, FIG. 2 is an explanatory diagram of the rIJ sliding mechanism of the bearing base metal shown in FIG. 1, and FIGS. The figure is an enlarged sectional view of a part of a conventional bearing, FIG. 5 is an enlarged sectional view of a part of the bearing base metal of FIG. 4, and FIG. 6 is an explanation showing the structure of the bearing base metal of the conventional example. FIG. 1 is an explanatory diagram showing the structure of a bearing base metal according to the present invention. Code 1...Matrix 2...Si
Particles 3...5n-Pb alloy particles 3a...S roll b Liquid phase 4...Overlay plating 5...Bearing alloy layer 6... ...Secret money patent applicant KonuDC Co., Ltd. Agent Patent attorney Yoshikatsu Matsushita Attorney Fumihiro Soejima Figure 3 Figure 4 Figure 5 Figure 1 3S) Autopsy ■ 2 Figure 6 Procedural amendment 5 , the date of the amendment order 6, the number of claims increased by the amendment, Mr. Yoshida Fumiki, an attorney at the Patent Office, 1, the full text of the specification subject to the amendment 8, the content of the amendment as shown in the attached sheet 3, the relationship between the person making the amendment and the case. relationship

Claims (1)

[Claims] 1) 7-20% Sn, 0.1-5% Pb, 1-20% by weight
Contains 10% Si and one or more of Cu, Mg, and Zn in a total of 0.3 to 3.0%, and C
r, Mn, Fe, Ni, Co, Ti, V, Zr back 1
In an Al-Sn bearing alloy containing one or more species in a total amount of 0.01 to 1.0%, with the remainder being substantially Al, 0.01 to 0.1% of Sb is added to produce Al. An Al-Sn bearing alloy characterized in that Si particles are dispersed and precipitated in a matrix in a spherical, elliptical, or rounded tip shape.