KR102346994B1 - Al-Zn-Cu alloy with high wear resistance and article using the same - Google Patents

Abstract

The present invention relates to a high wear resistance aluminum-zinc-copper alloy and articles using the same. More particularly, the present invention relates to an aluminum-zinc-copper alloy having improved wear resistance and tensile strength, and articles using the same.

Description

High wear resistance aluminum-zinc-copper alloy and article using same

The present invention relates to a high wear resistance aluminum-zinc-copper alloy and articles using the same.

Aluminum is a lightweight alloy with excellent corrosion resistance and thermal conductivity, but low mechanical properties such as strength. Therefore, aluminum is used as an aluminum alloy containing one or two or more of metals such as zinc, copper, silicon, magnesium, nickel, cobalt, zirconium, cerium, etc. to improve strength, and is used in various industrial fields, especially automobiles, ships, aircraft, etc. It is widely used as a structural material such as interior/exterior materials of

Aluminum alloy for casting has excellent castability and is therefore used for relatively uncomplicated electrical products or automobile parts. The most used aluminum casting alloy is an alloy in which elements such as Zn, Fe, Co, Ce are added to Al-Si, Al-Cu, or Al-Mg, and A356 alloy is representative. However, since the aluminum alloy for casting has low strength and poor wear resistance, there is a limit to its use as a structural material requiring wear resistance.

On the other hand, the aluminum-zinc alloy is an aluminum alloy used to improve aluminum strength, and usually contains 10 to 14 wt% of zinc based on the total weight of the alloy.

As a background technology of the present invention, Korean Patent No. 10-1760076 discloses an aluminum-zinc-copper (Al-Zn-Cu) cast alloy with improved strength and elongation.

To date, there is nothing known about a high wear resistance aluminum-zinc-copper alloy containing a high zinc content.

Accordingly, it is an object of the present invention to provide an aluminum-zinc-copper alloy with high wear resistance.

Another object of the present invention is to provide a high wear resistance article manufactured using the wear resistance aluminum-zinc-copper alloy of the present invention.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

According to one aspect, 49-60 mass% of zinc (Zn) based on the total mass of the alloy; 1 - 5 mass % of copper (Cu); and the remainder of aluminum (Al) and unavoidable impurities; including, a high wear resistance aluminum-zinc-copper alloy.

According to one embodiment, the wear-resistant aluminum-zinc-copper alloy comprises 53-60 mass % zinc (Zn); 2 - 5 mass % copper (Cu); and the remainder of aluminum (Al) and unavoidable impurities.

According to an embodiment, the wear-resistant aluminum-zinc-copper alloy may have a coefficient of friction of 0.15 or less.

According to one embodiment, the wear-resistant aluminum-zinc-copper alloy may have a coefficient of friction of 0.13 or less.

According to one embodiment, the wear-resistant aluminum-zinc-copper alloy may have a tensile strength of 360 MPa or more.

According to an embodiment, one or more elements selected from magnesium (Mg), manganese (Mn), titanium (Ti), iron (Fe), chromium (Cr), zirconium (Zr), and phosphorus (P) are each 1.5 It may further include less than or equal to mass%.

According to another aspect, an article made of the aluminum-zinc-silicon-copper alloy of the present disclosure is provided.

According to an embodiment, the article may be a tube material, a plate material, a bar material, a wire rod, an ingot, or a processed material obtained by processing them into a predetermined shape.

According to one embodiment, the wear resistance of the aluminum-zinc-copper alloy may be improved.

According to one embodiment, the tensile strength of the aluminum-zinc-copper alloy may be improved.

According to one embodiment, it is possible to provide an article of high wear resistance and high strength manufactured by using the wear-resistant aluminum-zinc-copper alloy of the present application.

1 is a graph showing the results of measuring the friction coefficient under 10N load of aluminum-zinc-copper alloys according to Examples 1 to 4 and Comparative Examples 1 to 6 of the present invention.
2 is a graph showing the result of measuring the friction coefficient of the aluminum-zinc-copper alloy according to Examples 1 to 4 and Comparative Examples 1 to 6 of the present invention under a load of 20N.
3 is a graph showing tensile strength and elongation of aluminum-zinc-copper alloys according to Examples 1 to 4 and Comparative Examples 1, 2, 4, and 6 of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

According to one aspect, the wear-resistant aluminum-zinc-copper alloy comprises 49-60 mass % zinc (Zn); 1 - 5 mass % of copper (Cu); and the remainder of aluminum (Al) and unavoidable impurities.

As the amount of zinc (Zn) added increases, it is advantageous to increase the wear resistance of the alloy of the present application. According to an increase in the addition amount of zinc in the alloy of the present disclosure, the generation of the zinc phase in the substrate may be accelerated.

In the alloy of the present disclosure, 49-60 mass% of zinc may be suitable for improving the wear resistance of the alloy, 53-60 mass% may be more suitable, and 53-58 mass% may be even more suitable. Although not limited thereto, if the zinc content is less than 49 mass%, the effect of improving the wear resistance of the alloy is small, and if it exceeds 60 mass%, the effect of improving the wear resistance is small compared to the addition of the content, and the tensile strength and/or elongation may be lowered, and the It can be difficult to control the amount.

In the present application, as the amount of copper (Cu) added increases, it may be advantageous to improve the wear resistance of the alloy of the present application. According to an increase in the amount of copper added in the alloy of the present disclosure, the zinc phase may be small and evenly dispersed in the substrate.

Including copper in an amount of 1-5 mass% in the alloy of the present invention may be suitable for improving the wear resistance of the alloy, 2-5 mass% may be more suitable, and 2-4 mass% may be more suitable. Although not limited thereto, if copper is less than 1% by mass, the effect of improving the wear resistance of the alloy is small, and if it is more than 5% by mass, the effect of improving the wear resistance is small and corrosion resistance, tensile strength, and/or elongation may be reduced. .

The remaining components of the alloy herein are aluminum (Al) and unavoidable impurities. In a typical manufacturing process, unintended impurities from raw materials or the surrounding environment may inevitably be mixed, and thus cannot be excluded. Since these impurities are known to any person skilled in the art in the manufacturing process, all details thereof are not specifically mentioned in the present specification.

The aluminum-zinc-copper alloy according to the present application may have a friction coefficient of 0.15 or less under a load of 20N.

The aluminum-zinc-copper alloy according to the present application may have a coefficient of friction of 0.13 or less under a load of 10N.

If at least one of the composition ranges of the aluminum-zinc-copper alloy according to the present application was not satisfied, the wear resistance could not be obtained.

As described above, the aluminum-zinc-copper alloy according to the present application may have improved wear resistance and improved strength compared to Comparative Examples. The aluminum-zinc-copper alloy according to the present application may have a tensile strength of 360 MPa or more, and 400 MPa or more. In this case, the aluminum-zinc-copper alloy according to the present application may have an elongation of 2 to 10%.

Accordingly, according to the present application, the aluminum-zinc alloy has excellent strength and improved wear resistance, so that it can be utilized in various fields.

The alloy of the present application contains at least one element selected from magnesium (Mg), manganese (Mn), titanium (Ti), iron (Fe), chromium (Cr), zirconium (Zr), and phosphorus (P) in an amount of 1.5% by mass, respectively. It may be further included below.

Magnesium (Mg) is an alloying element that can be added to the Al-Zn alloy to increase tensile strength and hardness, and when it is included in excess of 1.5% by mass, it may cause deterioration of corrosion resistance.

Manganese (Mn) is an alloying element that can increase ductility by being added to an Al-Zn alloy, and when it is included in an amount exceeding 1.5 mass %, segregation may be generated, which may cause a decrease in elongation.

Titanium (Ti) is an element that forms carbide by combining with carbon in the alloy, and the formed carbide is an alloy element that can suppress the growth of crystal grains to obtain crystal grain refinement and crack prevention effects of the cast material. It is suitable to include the content as 0.1 mass % or more, and if it is contained in excess of 1.5 mass %, it may cause a decrease in elongation.

Iron (Fe) is an alloy element that can be added to the Al-Zn alloy to obtain the effect of grain refinement and crack prevention of the cast material, and when it is included in excess of 1.5 mass %, it may cause a decrease in elongation.

Chromium (Cr) is an alloy element that can be added to the Al-Zn alloy to obtain the effect of improving corrosion resistance, and when it is included in excess of 1.5 mass %, it may cause deterioration of appearance.

Zirconium (Zr) is an alloy element that can be added to the Al-Zn alloy to obtain the effect of precipitation hardening and grain refinement, and when it is contained in excess of 1.5 mass %, it may cause a decrease in elongation.

Phosphorus (P) is an element that is unavoidably added during casting, and when its content exceeds 0.1%, there is a problem in that workability is greatly reduced due to segregation of phosphorus. In consideration of this, in the present invention, P may be included in an amount of 0.1% or less, and 0% is excluded in consideration of the unavoidable level.

According to another aspect, an article made of the aluminum-zinc-silicon-copper alloy described herein is provided.

The article may be a tube material, a plate material, a bar material, a wire rod, an ingot, or a processed material obtained by processing them into a predetermined shape.

According to another aspect, i) 49-60% by mass of zinc (Zn); 1 - 5 mass % of copper (Cu); and the remainder of aluminum (Al) and unavoidable impurities; preparing an aluminum-zinc-copper alloy molten metal containing; A second step of casting the aluminum-zinc-copper alloy molten metal prepared in step ii) by pouring it into a mold or sand sand, including; a method for producing an aluminum-zinc-copper alloy for casting is provided.

In the step of preparing the molten metal of the aluminum-zinc-copper alloy, it is possible to prepare the aluminum-copper master alloy or copper or zinc alone. Although not limited thereto, for example, an aluminum-copper master alloy may be added after complete melting of aluminum, and zinc may be added after complete melting of aluminum.

Although not limited thereto, the casting may be performed at a molten metal temperature of 600 to 800 °C.

Example

Hereinafter, the present invention will be described in more detail through the specific examples and comparative examples shown in Table 1, and their characteristic evaluation results.

Example 1 to 4 and comparative example 1 to 6

Table 1 shows the contents of Examples 1 to 4 and Comparative Examples 1 to 6 of the aluminum-zinc-copper alloy according to the present application.

The aluminum, zinc, and copper raw materials described in Table 1 were weighed according to the composition, and then melted in a high-frequency induction melting furnace to prepare an ingot using the master alloy.

At this time, the master alloy ingot was processed into a cylindrical shape with a diameter of 30 mm and a height of 9.35 mm for the friction test.

In addition, for the tensile strength test, the ingot was processed according to ASTM E8M rod-shaped tensile test specimen standard.

Wear-resistance evaluation

The friction coefficients of the cylinders processed from the aluminum-zinc-silicon-copper alloy according to Examples 1 to 4 of the present application were compared with those of Comparative Examples 1 to 6, and are shown in FIGS. 1 and 2 .

At this time, the friction coefficient was measured under the following conditions.

- Friction coefficient test machine: Tribometer (J&L TECH)

- Load : 10, 20N (6mm, 10mm)

- Linear speed : 50mm/s

- Ball : SUS304

As shown in FIG. 1 , unlike the comparative examples, the cylinders processed from the aluminum-zinc-copper alloy according to Examples 1 to 4 of the present application were able to maintain a friction coefficient of 0.13 or less under a 10N load for 50 seconds.

As shown in FIG. 2 , unlike the comparative examples, the cylinders processed from the aluminum-zinc-copper alloy according to Examples 2 to 4 of the present application were able to maintain a friction coefficient of 0.15 or less under a 20N load for 50 seconds.

Tensile strength evaluation

The tensile strength test of the aluminum-zinc-copper alloys according to Examples 1 to 4 of the present application was compared with Comparative Examples 1, 2, 4, and 6, and is shown in FIG. 3 .

The tensile strength test was performed under the following conditions.

- Tensile test machine: INSTRON 5982

- Cross head speed: 2 mm/min

- Extensometer: 25 mm

- Specimen: ASTM E8M

- Thickness: 1.5 mm

As shown in FIG. 3 , when even a portion of the composition of the aluminum-zinc-copper alloy of the present application is deviated, the tensile strength may be less than 360 MPa (Comparative Example 5).

In addition, as shown in FIG. 3, the tensile strength of the cast material of the aluminum-zinc-copper alloy according to Example 3 was 420 MPa, compared to Example 4, in which the zinc content and the copper content were both 60 mass% and 5 mass%, respectively. It was confirmed that both tensile strength and elongation were the most excellent with an elongation of 2 to 7%.

In the above, although an embodiment of the present invention has been described, those of ordinary skill in the art can add, change, delete or Various modifications and variations of the present invention may be made by addition, etc., and this will also be included within the scope of the present invention.

Claims (8)

with respect to the total mass of the alloy
53 - 60 mass % zinc (Zn);
1 - 5 mass % copper (Cu); and
A high wear resistance aluminum-zinc-copper alloy comprising; aluminum (Al) and the remainder of unavoidable impurities. The method of claim 1,
53 - 60 mass % zinc (Zn);
2 - 5 mass % of copper (Cu); and
A high wear resistance aluminum-zinc-copper alloy comprising; aluminum (Al) and the remainder of unavoidable impurities. The method of claim 1,
A high wear resistance aluminum-zinc-copper alloy with a coefficient of friction of 0.15 or less. The method of claim 1,
A high wear resistance aluminum-zinc-copper alloy with a coefficient of friction of 0.13 or less. The method of claim 1,
A high wear-resistant aluminum-zinc-copper alloy with a tensile strength of at least 360 MPa. The method of claim 1,
At least one element selected from magnesium (Mg), manganese (Mn), titanium (Ti), iron (Fe), chromium (Cr), zirconium (Zr), and phosphorus (P) is further included in an amount of 1.5% by mass or less, respectively high wear-resistant aluminum-zinc-copper alloy. An article made of the high wear resistance aluminum-zinc-copper alloy according to any one of claims 1 to 6. 8. The method of claim 7,
The article is an article, wherein the article is a pipe material, a plate material, a bar material, a wire rod, an ingot, or a processed material obtained by processing these into a predetermined shape.

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