KR102341119B1 - Improved aluminum alloy and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an improved aluminum alloy and a manufacturing method thereof, and the manufacturing method of the aluminum alloy according to the present invention uses a metal element that has not been used before as a material and transforms each process step in more detail to manufacture an aluminum alloy excellent in heat resistance, wear resistance and the like. The manufacturing method of the aluminum alloy according to the present invention includes a step of manufacturing a first aluminum alloy billet, a step of manufacturing a second aluminum alloy billet, a homogenization step, an extruding step, and a brazing step.

Description

Improved aluminum alloy and manufacturing method thereof

The following examples relate to an improved aluminum alloy and a method for manufacturing the same.

Aluminum has a light weight of 2.7, good extensibility, and excellent corrosion resistance. It is also a very useful metal because it can be combined with several elements to form alloys. Aluminum alloys include high-strength aluminum alloys and heat-resistant aluminum alloys, and so-called duralumin of Al-Cu-Mg-based and Al-Zn-Mg-Cu-based alloys, respectively, and the material strength almost decreases up to a temperature of 200 to 250 ° C. There are Al-Si-Mg-Cu-based alloys and Al-Cu-Ni-Mg-based alloys that are not used. Aluminum alloy is widely used in various fields such as engine parts such as pistons, aircraft parts, and LNG tanks.

Recently, in relation to the aluminum alloy manufacturing method, Korean Patent Application Laid-Open No. 10-2021-0028627 (aluminum iron alloy plated steel sheet for hot forming and its manufacturing method), Korean Patent Application Laid-Open No. 10-2021-0037580 (corrosion resistance is and an improved aluminum alloy tube for heat transfer tube and a method for manufacturing the same). However, although these conventional aluminum alloys have superior strength and physical properties compared to pure aluminum or initial aluminum alloys, there is a continuous need for a method of manufacturing an aluminum alloy having appropriate physical properties that can be more effectively applied to the purpose or action of a specific product. It is becoming.

Under this background, the present inventors have completed the present invention by using various elemental materials compared to the prior art, and studying a method for manufacturing an aluminum alloy in which process steps are modified and applied.

The present invention comprises the steps of dissolving and casting silicon, copper, manganese, zinc, chromium, molybdenum, cobalt, and aluminum to prepare a first aluminum alloy billet; dissolving and casting silicon, iron, manganese, magnesium, titanium, nickel, vanadium and aluminum to prepare a second aluminum alloy billet; a homogenization step of heating the first and second aluminum alloy billets to a temperature of 500 to 550° C., maintaining them for 10 hours, and then cooling them to room temperature under inert gas conditions; Heating the homogenized first aluminum alloy billet to a temperature of 350 to 400 ° C in an extruder, adding a second aluminum alloy billet, heating to a temperature of 450 to 520 ° C, and extruding the aluminum alloy manufacturing method would like to provide

These and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The above object is to prepare a first aluminum alloy billet by dissolving and casting silicon, copper, manganese, zinc, chromium, molybdenum, cobalt, and aluminum; dissolving and casting silicon, iron, manganese, magnesium, titanium, nickel, vanadium and aluminum to prepare a second aluminum alloy billet; a homogenization step of heating the first and second aluminum alloy billets to a temperature of 500 to 550° C., maintaining them for 10 hours, and then cooling them to room temperature under inert gas conditions; Heating the homogenized first aluminum alloy billet to a temperature of 350 to 400 ° C in an extruder, adding a second aluminum alloy billet, heating to a temperature of 450 to 520 ° C, and extruding the aluminum alloy manufacturing method can be achieved by

Specifically, the first aluminum alloy billet manufacturing step may include the step of further melting and casting molybdenum and cobalt.

Specifically, the second aluminum alloy billet manufacturing step may include further melting and casting nickel and vanadium.

Specifically, the first or second aluminum alloy billet manufacturing step may include adding sodium acetate, sodium hydroxide, and dioctyl phthalate as additives.

Specifically, the first aluminum alloy billet manufacturing step is to melt and cast 0.07 wt% of silicon, 0.29 wt% of copper, 1.02 of manganese, 0.007 of zinc, 0.005 of chromium, 1.25 of molybdenum, 2.25 of cobalt, and the remainder of aluminum as weight %, 2 The aluminum alloy billet manufacturing step may be melting and casting silicon 0.07, iron 0.19, manganese 1.02, magnesium 0.34, titanium 0.02, nickel 0.04, vanadium 0.008 and the remaining amount of aluminum.

The aluminum alloy manufacturing method according to the present invention can manufacture an aluminum alloy excellent in heat resistance, wear resistance, etc. by modifying each process step in more detail while utilizing a metal element that has not been used before as a material.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 and 2 relate to a manufactured aluminum alloy billet, according to one embodiment.
3 and 4 relate to an aluminum alloy billet as a comparative example with different composition ratios, according to an embodiment.
5 and 6 show an aluminum alloy product manufactured through an extrusion process, respectively, according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all modifications, equivalents and substitutes for the embodiments are included in the scope of the rights.

Specific structural or functional descriptions of the embodiments are disclosed for purposes of illustration only, and may be changed and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosure form, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical spirit.

Although terms such as first or second may be used to describe various elements, these terms should be interpreted only for the purpose of distinguishing one element from another. For example, a first component may be termed a second component, and similarly, a second component may also be termed a first component.

When a component is referred to as being “connected to” another component, it may be directly connected or connected to the other component, but it should be understood that another component may exist in between.

The terms used in the examples are used for the purpose of description only, and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a 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.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. have meaning Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, cases including the plural are included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated component.

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and as those skilled in the art will fully understand, technically various interlocking and driving are possible, and each embodiment may be implemented independently of each other, It may be possible to implement together in a related relationship.

One aspect of the present invention, silicon, copper, manganese, zinc, chromium, molybdenum, cobalt, and dissolving and casting aluminum to prepare a first aluminum alloy billet; dissolving and casting silicon, iron, manganese, magnesium, titanium, nickel, vanadium and aluminum to prepare a second aluminum alloy billet; a homogenization step of heating the first and second aluminum alloy billets to a temperature of 500 to 550° C., maintaining them for 10 hours, and then cooling them to room temperature under inert gas conditions; Heating the homogenized first aluminum alloy billet to a temperature of 350 to 400 ° C in an extruder, adding a second aluminum alloy billet, heating to a temperature of 450 to 520 ° C, and extruding the aluminum alloy manufacturing method provides In the above manufacturing method, the first and second aluminum alloy billets are melted and cast, respectively. The first aluminum alloy billet is pre-heated in an extruder after homogenization, and then the second aluminum is added under a higher temperature condition and heated and extruded, so that it is possible to manufacture an aluminum alloy with improved physical properties.

In the present invention, the first aluminum alloy billet manufacturing step may include the step of further melting and casting molybdenum and cobalt.

In one embodiment, the second aluminum alloy billet manufacturing step may include the step of further melting and casting nickel and vanadium.

In one embodiment, the first or second aluminum alloy billet manufacturing step may include adding sodium acetate, sodium hydroxide, and dioctylphthalate as additives in an amount of 0.001% based on the total weight%. The additive is composed of other additives in addition to the additives added in the manufacture of conventional alloys, and helps to keep the cooling rates of the central and peripheral parts similar during cooling in the alloying process and to supplement durability and corrosion resistance.

In one embodiment, the first or second aluminum alloy billet manufacturing step comprises 0.01 to 0.15 silicon, 0.15 to 0.30 iron, 0.25 to 0.40 copper, 0.90 to 1.20 manganese, 0.30 to 0.35 magnesium, 0.01 to 0.05 zinc it could be

In an embodiment, the first aluminum alloy billet manufacturing step comprises 0.07 wt% silicon, 0.29 wt% copper, 1.02 wt% manganese, 0.007 wt% zinc, 0.005 wt% chromium, 1.25 wt% molybdenum, and 2.25 wt% cobalt by weight. wt%, and the remaining amount of aluminum may be dissolved and cast.

In an embodiment, the second aluminum alloy billet manufacturing step comprises 0.07 wt% silicon, 0.19 wt% iron, 1.02 wt% manganese, 0.34 wt% magnesium, 0.02 wt% titanium, 0.04 wt% nickel, 0.008 wt% by weight of the second aluminum alloy billet. It may be to melt and cast wt% and the remaining amount of aluminum.

With respect to the weight % of each component, if the weight % of each component significantly deviates from this, there is a problem in that an aluminum alloy having desired properties is not manufactured. Specifically, in the case of the prior art, silicon is generally included in an amount of 0.05 to 0.5 wt%, but the present invention does not exceed 0.15 at most. In the case of iron component, when it is lower than 0.1%, it does not substantially affect the improvement of strength and physical properties, and when it is higher than 0.35%, a surface scratch phenomenon is induced during the extrusion process, and extrudability may be lowered. In addition, in the case of copper component, when it is lower than 0.2 wt%, there is virtually no stretching effect, and when it is higher than 0.4%, it is difficult to expect a corrosion resistance role. In the case of magnesium, it is difficult to obtain the desired strength if it is 0.2% or less, and if it exceeds 0.4%, a problem may occur in the process step.

1 and 2 relate to an alloy manufactured through the manufacturing method of the present invention. Specifically, 0.07 wt% of silicon, 0.29 wt% of copper, 1.02 wt% of manganese, 0.007 wt% of zinc, 0.005 wt% of chromium, 1.25 wt% of molybdenum, 2.25 wt% of cobalt, and the remaining amount of aluminum are placed in a furnace at a temperature of 500 to 540 ° C. After melting into a furnace, a first aluminum alloy billet was manufactured through a casting machine. Next, 0.07 wt% silicon, 0.19 wt% iron, 1.02 wt% manganese, 0.34 wt% magnesium, 0.02 wt% titanium, 0.04 wt% nickel, 0.008 wt% vanadium and the remaining amount of aluminum are melted and cast to melt and cast a second aluminum alloy billet was prepared. The first and second aluminum alloy billets were heated to a temperature of 500 to 550° C. and maintained for 10 hours, followed by a homogenization step of cooling to room temperature under inert gas conditions ( FIGS. 1 and 2 ). Next, the first homogenized aluminum alloy billet was heated to a temperature of 350 ~ 400 ℃ in the extruder, and after heating to a temperature of 450 ~ 520 ℃ after adding the second aluminum alloy billet was extruded. Specifically, a pipe composed of an aluminum alloy was extruded by extruding in an extruder under specific conditions (container temperature 410 to 450 ° C, die temperature 430 to 470 ° C, extrusion speed 4 to 4.5 ram) (outer diameter 35 +0.1, -0.05; thickness 1.64 +0.08, -0.04; inner diameter 31.72 +0.1, -0.05). After calibrating with a correction amount of about 30 to 80 mm through a straightener, the appearance, material, tensile strength, yield strength, and elongation of the product were examined. (tensile strength 14.3 kgf/mm2, yield strength 6.3 kgf/mm2, elongation 34%) These physical properties correspond to mechanical properties different from those of aluminum alloy products on the market, and the manufacturing method of the present invention has a tensile strength of 14.3 kgf/mm2 mm2, a yield strength of 6.3 kgf/mm2, and a method of manufacturing an aluminum alloy having physical properties of 34% elongation.

Unlike the above, a billet containing 0.5% silicon ( FIG. 3 ) and a billet containing 0.5% copper ( FIG. 4 ) were prepared, and as a result, it was confirmed that fine scratches were generated on the surface.

In one embodiment, the method of manufacturing the aluminum alloy may include a brazing welding step. The brazing welding step may be maintained at a temperature of 580 to 620 degrees for 1 to 2 hours to adhere to a high temperature with a solvent.

5 shows a product manufactured by extruding based on the aluminum alloy manufactured through the manufacturing method of the present invention. It can be seen that the state of the alloy after brazing is good. On the other hand, it can be seen that, as shown in FIG. 6 , when the alloy is manufactured with the magnesium content of 0.9wt% as an exemplary component and then fused and brazed, as shown in FIG. 6 .

In one embodiment, the manufacturing method of the present invention is a manufacturing method on an aluminum alloy containing 0.15 wt% or less of silicon and 0.1 wt% or less of zinc. The aluminum alloy manufactured by the manufacturing method of the present invention may have a small grain size on the surface, and may contain a large amount of white phase component.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (3)

Silicon 0.07 wt%, copper 0.29 wt%, manganese 1.02 wt%, zinc 0.007 wt%, chromium 0.005 wt%, molybdenum 1.25 wt%, cobalt 2.25 wt%, and the remaining amount of aluminum are melted and cast at a temperature of 500 to 540 ° C. 1 manufacturing an aluminum alloy billet;
Dissolving and casting 0.07 wt% silicon, 0.19 wt% iron, 1.02 wt% manganese, 0.34 wt% magnesium, 0.02 wt% titanium, 0.04 wt% nickel, 0.008 wt% vanadium and the remainder of aluminum to prepare a second aluminum alloy billet step;
a homogenization step of heating the first and second aluminum alloy billets to a temperature of 500 to 550° C. and maintaining them for 10 hours, followed by cooling to room temperature under inert gas conditions;
The homogenized first aluminum alloy billet is heated to a temperature of 350 to 400° C. in an extruder, a second aluminum alloy billet is added, and then heated to a temperature of 450 to 520° C., followed by a container temperature of 410 to 450° C. and a die temperature of 430 to Extruding in an extruder under the conditions of 470 ℃ extrusion rate 4 ~ 4.5 ram; and
A method for producing an aluminum alloy, comprising a brazing welding step of maintaining at a temperature of 580 to 620 ° C for 1 to 2 hours and adhering at a high temperature with a solvent,
The first or second aluminum alloy billet production step comprises adding sodium acetate, sodium hydroxide, and dioctylphthalate as additives.

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