Wear-resistant sintered aluminum alloy with high strength and manufacturing method thereof

a technology high strength, which is applied in the field of wear-resistant sintered aluminum alloy, can solve the problems of limited application of sintered aluminum alloy, and achieve the effects of improving high tensile strength and elongation, and high wear resistan

Inactive Publication Date: 2006-01-19
ICHIKAWA JUNICHI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] In accordance with the above construction, the sintered aluminum alloy of the present invention is excellent to have high tensile strength and elongation as well as high wear resistance. In the manufacturing method of a sintered aluminum alloy of the present invention, the tensile strength and the elongation are especially improved for wear resistant sintered aluminum alloys, to enable application to various kinds of sliding members used in vehicles and realize various sliding members of small weight.

Problems solved by technology

However, they are to an extent of 360 MPa or so in terms of the strength even when they are subjected to forging and heat treatment, and the application of them is limited and a sintered aluminum alloy with a higher level of strength has been therefore expected to be produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0070] For each sample, the raw material powder blending step, the compacting step, the sintering step, the forging step, and the heat treatment step were sequentially performed to manufacture and evaluate five kinds of samples of sintered aluminum alloy having a overall composition shown in Table 2. Specifically, in the raw material powder blending step, aluminum powder having a particle size of minus sieve of 100 meshes screen; zinc powder, magnesium powder, copper powder, tin powder, bismuth powder, indium powder, lead-free solder powder containing 8 mass % Zn, 3 mass % Bi and the balance Sn, each of which had a particle size of minus sieve of 250 meshes screen respectively; silicon carbide powder, chromium boride powder and boron carbide powder, each of which had a particle size of minus sieve of 125 meshes screen, were prepared to provide a raw material powder by blending and mixing those powders together in accordance with the blending ratio shown in Table 1.

[0071] In the com...

example 2

[0083] In this example, using the raw material powder prepared in Example 1 and the same blending ratio for sample No. A03: 5.5 mass % zinc powder; 2.5 mass % magnesium powder; 1.5 mass % copper powder; 5 mass % boron carbide powder; 0.1 mass % tin powder; and the balance aluminum powder, sintered aluminum alloy samples were manufactured by performing the same operation of Example 1, excepting that the compacting pressure, the sintering conditions (temperature-elevating rate in the range from 400 degrees C. to the sintering temperature, the sintering temperature and time), and the forging conditions (the heating temperatures of the sintered compact and the forging die, the upsetting ratio) were changed to those shown in Table 4. Regarding each of these samples, the same estimation in Example 1 was executed. The results are shown in Table 5.

TABLE 4sinteringcompactingelevat.sint.forgingsamplepressureratesint. temp.timetemp.upsettingNo.MPa° C. / min° C.min° C.ratio %A34100106002040040A...

example 3

[0096] In this example, comparison was made between the case where zinc is incorporated in the form of aluminum alloy powder (No. B01) and the case where it is in the form simple zinc powder (No. B02). Specifically, in the raw material powder blending step for No. B01, aluminum powder having a particle size of minus sieve of 100 meshes screen; aluminum alloy powder containing 12 mass % Zn; boron carbide powder having a particle size of minus sieve of 125 meshes screen as a powder for the hard particles; zinc powder, magnesium powder, copper powder and tin powder, each of which had a particle size of minus sieve of 250 meshes screen respectively, were prepared to provide a raw material powder having a overall composition of Zn: 5.5%, Mg: 2.5%, Cu: 1.5%, Sn: 0.1%, hard particles (boron carbide): 5.0% and the balance Al and inevitable impurities, by blending and mixing those powders together in accordance with the blending ratio shown in Table 6.

[0097] In the compacting step, adjustin...

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Abstract

Disclosed is a wear-resistant sintered aluminum alloy with high strength and a manufacturing method thereof. The sintered aluminum alloy contains, by mass: 3.0-10% zinc; 0.5-5.0% magnesium; 0.5-5.0% copper; 0.1-10% hard particles; impurities; and aluminum. The metallographic structure has an aluminum alloy matrix in which the hard particles dispersed; and an intermetallic compound phase being dispersedly precipitated in the aluminum alloy matrix. Using an aluminum powder, a hard particles powder and other powders, a compact is formed and sintered at 580-610 degrees C., then cooled and subjected to heat treatment at a temperature of 460-490 degrees C., including water-quenching and aging at 110-200 degrees C.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a wear-resistant sintered aluminum alloy with high strength that is suitable for various kinds of sliding parts such as connecting rods, pistons and the like, and a method of manufacturing thereof. More particularly, the invention concerns a wear-resistant sintered aluminum alloy with high strength that is improved in tensile strength and elongation as well as wear resistance, and a manufacturing method thereof. [0003] 2. Related Art [0004] Regarding the aluminum sintered parts manufactured with the use of a powder-metallurgical method, there has been an increasing demand in recent years, since they are not only light in weight but also possible to possess preferable properties that cannot be obtained with cast materials, such as strength, wear resistance and the like. Specifically, in a case of wrought alloy containing a large amount of silicon, only alloy having metallographic stru...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F3/24
CPCB22F2003/248B22F2998/10C22C21/10C22C32/0047B22F3/16B22F3/17B22F3/24
Inventor ICHIKAWA, JUNICHIMORITA, KENZO
Owner ICHIKAWA JUNICHI
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