KR20100105917A - Aluminum-magnesium alloy for interior and exterior materials - Google Patents

Aluminum-magnesium alloy for interior and exterior materials Download PDF

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KR20100105917A
KR20100105917A KR1020090024269A KR20090024269A KR20100105917A KR 20100105917 A KR20100105917 A KR 20100105917A KR 1020090024269 A KR1020090024269 A KR 1020090024269A KR 20090024269 A KR20090024269 A KR 20090024269A KR 20100105917 A KR20100105917 A KR 20100105917A
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South Korea
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alloy
aluminum
magnesium
interior
exterior materials
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KR1020090024269A
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Korean (ko)
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김장희
홍성두
김원준
이승현
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알티전자 주식회사
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Priority to KR1020090024269A priority Critical patent/KR20100105917A/en
Priority to CN2009101350567A priority patent/CN101845577B/en
Publication of KR20100105917A publication Critical patent/KR20100105917A/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon

Abstract

PURPOSE: An aluminum-magnesium alloy for interior and exterior materials, which forms interior and exterior materials in die-casting method by improving fluidity, is provided to increase the density of a structure by suppressing the produce of pores in a die-casting process. CONSTITUTION: An aluminum-magnesium alloy for interior and exterior materials comprises the component 0.1~2.5 weight% fining crystal grain. The component fining grain comprises titanium and boron. Titanium 0.1~1.5 weight%, boron 0.002~1.0 weight% magnesium 7.0~10.0 weight% and silicon 0.9~1.5 weight% are included.

Description

내외장재용 알루미늄-마그네슘 합금{ALUMINUM-MAGNESIUM ALLOY FOR INTERIOR AND EXTERIOR MATERIALS}Aluminum-magnesium alloy for interior and exterior materials {ALUMINUM-MAGNESIUM ALLOY FOR INTERIOR AND EXTERIOR MATERIALS}

본 발명은 알루미늄-마그네슘 합금(Al-Mg alloy)에 관한 것으로서, 특히 다이캐스팅 방식에 의하여 제조되어 전자제품의 내외장재로 사용되는 알루미늄-마그네슘 합금(Al-Mg alloy)에 관한 것이다.The present invention relates to an aluminum-magnesium alloy (Al-Mg alloy), and more particularly, to an aluminum-magnesium alloy (Al-Mg alloy) manufactured by a die casting method and used as interior and exterior materials of electronic products.

최근 전자 산업의 발달과 함께 전자 제품의 케이스 등은 점차 박판화되고, 특히 휴대전화, 노트북 등으로 대표되는 휴대형 정보 단말기 등의 급속한 보급에 따라 이들 제품의 케이스나 브래킷 등의 재료로써 마그네슘(Mg)과 알루미늄(Al)을 주성분으로 하는 비철금속 합금의 수요가 높아지고 있다.With the recent development of the electronics industry, cases of electronic products have gradually become thin, and in particular, with the rapid spread of portable information terminals such as mobile phones and laptops, magnesium (Mg) and The demand for nonferrous metal alloys containing aluminum (Al) as a main component is increasing.

특히 최근에는 알루미늄-마그네슘 합금(Al-Mg alloy)을 이용하여 제작되는 전자제품의 내외장재는 대량 생산 및 형상 구현의 자유도 향상을 위해 다이캐스팅 방식에 의해 제작되고 있다.In particular, the interior and exterior materials of electronic products manufactured using aluminum-magnesium (Al-Mg alloy) have been manufactured by a die casting method to improve the degree of freedom of mass production and shape implementation.

상기 다이캐스팅용 합금으로서 특히 요구되는 성질은 유동성이 좋을 것, 열 간취성이 적을 것, 응고수축에 의한 용탕 보급성이 좋을 것, 금형에 점착하지 않을 것 등이 있다.Particularly required properties for the die casting alloy include good fluidity, low hot brittleness, good melt replenishability due to solidification shrinkage, no sticking to the mold, and the like.

상기 유동성은 알루미늄-마그네슘 합금(Al-Mg alloy)에 의하여 제작되는 제품의 기계적 강도 및 형상 구현의 곤란성 등에 영향을 미친다.The fluidity affects the mechanical strength of the product manufactured by the Al-Mg alloy and the difficulty of implementing the shape.

즉, 상기 알루미늄-마그네슘 합금(Al-Mg alloy) 중 상기 마그네슘(Mg)은 강환원성이 있어 수증기와 접하면 수소(H)를 흡수하는데, 상기 알루미늄-마그네슘 합금(Al-Mg alloy)의 용융체를 금형에 주입 시 유동성이 낮으면 금형 내의 수분에 의하여 알루미늄-마그네슘 합금(Al-Mg alloy)의 용융체 표면 부근에 기포를 생성하기 쉽게 된다.In other words, the magnesium (Mg) of the Al-Mg alloy is strongly reduced to absorb hydrogen (H) when contacted with water vapor, and the molten body of the Al-Mg alloy (Al-Mg alloy) When the fluidity is low when injected into the mold, it is easy to generate bubbles near the molten surface of the Al-Mg alloy due to moisture in the mold.

이는 내부 조직의 치밀화를 저하시키게 되므로 제품의 기계적 강도를 저하시키고, 제품의 형상을 구현하는데 곤란한 문제점이 있다.This lowers the densification of internal tissues, thereby lowering the mechanical strength of the product, and it is difficult to implement the shape of the product.

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 알루미늄-마그네슘 합금(Al-Mg alloy)의 유동성을 향상시켜 다이캐스팅 방식에 의해 내외장재의 형성 시 형상 구현의 어려움을 방지하고, 기계적 강도를 향상시킬 수 있는 내외장재용 알루미늄-마그네슘 합금을 제공하는 것을 그 목적으로 한다.The present invention is to solve the above problems, to improve the fluidity of the aluminum-magnesium alloy (Al-Mg alloy) to prevent the difficulty of implementing the shape when forming the interior and exterior materials by the die-casting method, it is possible to improve the mechanical strength It is an object to provide an aluminum-magnesium alloy for interior and exterior materials.

본 발명에 따른 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy)에는 마그네슘(Mg)과, 실리콘(Si)과, 결정립을 미세화하는 성분으로서 티타늄(Ti) 및 보론(B)이 포함될 수 있다.The aluminum-magnesium alloy (Al-Mg alloy) for interior and exterior materials according to the present invention may include magnesium (Mg), silicon (Si), and titanium (Ti) and boron (B) as components for miniaturizing crystal grains.

여기서, 상기 마그네슘(Mg)은 7.0~10.0 wt%, 상기 티타늄(Ti)은 0.1~1.5 wt%, 상기 실리콘(Si)은 0.9~1.5 wt%, 상기 보론(B)은 0.002~1.0 wt%가 포함될 수 있다.Here, the magnesium (Mg) is 7.0 ~ 10.0 wt%, the titanium (Ti) is 0.1 ~ 1.5 wt%, the silicon (Si) 0.9 ~ 1.5 wt%, the boron (B) is 0.002 ~ 1.0 wt% May be included.

본 발명에 따른 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy)에 의하면, 용융 상태에서의 알루미늄-마그네슘 합금(Al-Mg alloy)의 유동도를 증가시켜 다이캐스팅 공정 중 알루미늄-마그네슘 합금(Al-Mg alloy) 내에 기포 발생에 의한 기공 형성을 억제하여 치밀한 조직을 형성함으로써, 알루미늄-마그네슘 합금(Al-Mg alloy)의 기계적 강도 향상 및 제품의 형상 구현을 용이하게 할 수 있는 장점이 있다.According to the aluminum-magnesium alloy (Al-Mg alloy) for interior and exterior materials according to the present invention, the aluminum-magnesium alloy (Al-Mg) during the die casting process by increasing the flow rate of the aluminum-magnesium alloy (Al-Mg alloy) in the molten state By suppressing pore formation due to bubble generation in the alloy) to form a dense structure, there is an advantage that it is easy to improve the mechanical strength of the aluminum-magnesium alloy (Al-Mg alloy) and implement the shape of the product.

이하 본 발명에 따른 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy)에 대해 상세히 설명하기로 한다.Hereinafter, the aluminum-magnesium alloy (Al-Mg alloy) for interior and exterior materials according to the present invention will be described in detail.

본 발명의 내외장용 알루미늄-마그네슘 합금(Al-Mg alloy)은 다이캐스팅(die casting) 공정에 의하여 전자 제품 등을 제작하기 위한 재료로 알루미늄(Al)과, 마그네슘(Mg)과, 티타늄(Ti)과, 실리콘(Si) 및 보론(B)을 포함한다.The interior and exterior aluminum-magnesium alloy (Al-Mg alloy) of the present invention is a material for manufacturing electronic products by die casting process, such as aluminum (Al), magnesium (Mg), titanium (Ti) and , Silicon (Si) and boron (B).

상기 마그네슘(Mg)은 합금의 인장 강도를 증가시킬 수 있으며, 상기 마그네슘(Mg)의 첨가에 의하여 알루미늄-마그네슘(Al-Mg) 합금은 높은 강도, 우수한 내식성, 용접성 및 표면 마감 특성을 가질 수 있다.The magnesium (Mg) may increase the tensile strength of the alloy, the aluminum-magnesium (Al-Mg) alloy may have a high strength, excellent corrosion resistance, weldability and surface finish characteristics by the addition of magnesium (Mg). .

상기 티타늄(Ti)은 알루미늄-마그네슘(Al-Mg) 합금에 첨가되어 결정립을 미세화하여 기계적 성질을 향상시킬 수 있고, 용융 상태에서 합금의 유동성을 증진시켜 기포 생성을 방지할 수 있으며, 열간 가공성을 향상시킬 수 있다.The titanium (Ti) is added to the aluminum-magnesium (Al-Mg) alloy to refine the crystal grains to improve the mechanical properties, to improve the fluidity of the alloy in the molten state to prevent the formation of bubbles, hot workability Can be improved.

상기 실리콘(Si)은 상기 알루미늄-마그네슘(Al-Mg) 합금에 대한 다이캐스팅 공정 도중 융점이 낮은 공정(共晶)을 생성하여 용융 상태에서 합금의 유동성을 증진시킬 수 있고, 공정성분에 가까워지면 응고온도범위가 좁아져서 용탕 보급성이 좋아지며, 수지상정(樹枝狀晶) 간의 미세 수축공이 감소하여 열간취성이 적어서 균열의 발생을 억제할 수 있다.The silicon (Si) may improve the fluidity of the alloy in the molten state by producing a low melting point during the die casting process for the aluminum-magnesium (Al-Mg) alloy, and solidification when the process component is close to The temperature range is narrowed, so that the meltability of the melt is improved, and the fine shrinkage hole between the dendrites is reduced, so that the hot brittleness is small, so that the occurrence of cracks can be suppressed.

상기 보론(B)의 첨가는 용융 상태의 알루미늄-마그네슘(Al-Mg) 합금에 상기 티타늄(Ti)이 가지는 미세화 특성을 균일하게 하고, 즉 용융 상태의 알루미늄-마그네슘 합금(Al-Mg) 내에서 티타늄(Ti)이 뭉침이 없이 균일하게 분산되도록 하고, 취성을 나타내는 것을 방지할 수 있다.The addition of boron (B) uniforms the micronization characteristics of the titanium (Ti) to the molten aluminum-magnesium (Al-Mg) alloy, that is, in the molten aluminum-magnesium alloy (Al-Mg) Titanium (Ti) can be uniformly dispersed without aggregation, and can be prevented from exhibiting brittleness.

상기와 같은 성분의 첨가는 알루미늄-마그네슘(Al-Mg) 합금의 유동성을 증가시켜 기포 생성을 방지할 수 있고, 결정립 미세화에 의한 기계적 성질을 향상시킬 수 있으며, 열간 가공성을 향상시킬 수 있다.The addition of the above components may increase the fluidity of the aluminum-magnesium (Al-Mg) alloy to prevent bubble formation, improve mechanical properties by grain refinement, and improve hot workability.

다음은 본 발명의 알루미늄-마그네슘(Al-Mg) 합금에 포함된 성분의 조성표를 나타낸다.The following shows the composition table of the components contained in the aluminum-magnesium (Al-Mg) alloy of the present invention.

MgMg TiTi SiSi BB 함량(wt%)Content (wt%) 7.0~10.07.0-10.0 0.1~1.50.1-1.5 0.9~1.50.9-1.5 0.002~1.00.002-1.0

상기 표 1과 같은 조성비를 갖는 알루미늄-마그네슘(Al-Mg) 합금에 있어서, 상기 마그네슘(Mg)이 7.0 wt% 미만으로 함유되면, 시효 경화성이 부족하여 합금의 강도가 저하될 수 있다. In the aluminum-magnesium (Al-Mg) alloy having a composition ratio as shown in Table 1 above, when the magnesium (Mg) is contained in less than 7.0 wt%, aging hardenability may be insufficient and the strength of the alloy may be lowered.

반면, 상기 마그네슘(Mg)이 10.0 wt% 를 초과하면 용융 상태의 알루미늄-마그네슘(Al-Mg) 합금의 유동성을 저하시켜 합금 내에 기공의 발생을 증가시킬 수 있고, 합금에 두꺼운 양극 산화 피막을 형성되어 산화 로스(loss)에 의한 얼룩이나 크랙 등의 결함이 용이하게 생길 수 있다.On the other hand, when the magnesium (Mg) exceeds 10.0 wt%, the fluidity of the molten aluminum-magnesium (Al-Mg) alloy may be reduced to increase the generation of pores in the alloy, thereby forming a thick anodized film in the alloy. As a result, defects such as stains and cracks due to loss of oxide may easily occur.

상기 티타늄(Ti)의 경우, 0.1 wt% 미만으로 함유되면 용융 상태의 알루미늄-마그네슘(Al-Mg) 합금의 유동성을 저하시킬 수 있고, 주조 균열이 발생될 수 있는 반면, 1.5 wt% 를 초과하면 조대 Al-Ti 금속간 화합물 결정이 석출되어 성형성에 부작용을 초래할 수 있다.In the case of titanium (Ti), the content of less than 0.1 wt% may reduce the fluidity of the molten aluminum-magnesium (Al-Mg) alloy, and may cause casting cracks, whereas if it exceeds 1.5 wt% Coarse Al-Ti intermetallic crystals may precipitate and cause adverse effects on formability.

상기 실리콘(Si)의 경우, 0.9 wt% 미만으로 함유되면 용융 상태의 알루미늄-마그네슘(Al-Mg) 합금의 유동성 증가에 영향을 미치지 않을 수 있고, 1.5 wt%를 초과하면 Mg2Si 상을 만들어 연성 및 신장성을 감소시킬 수 있다.In the case of the silicon (Si), containing less than 0.9 wt% may not affect the increase in the fluidity of the molten aluminum-magnesium (Al-Mg) alloy, and if it exceeds 1.5 wt% to form a Mg 2 Si phase It can reduce ductility and extensibility.

상기 보론(B)의 경우, 0.002~1.0 wt% 내에서 알루미늄-마그네슘(Al-Mg) 합금에 첨가되면 강도를 유지하면서 용융 상태에서의 유동성을 향상시킬 수 있다.In the case of the boron (B), when added to the aluminum-magnesium (Al-Mg) alloy within 0.002 ~ 1.0 wt% it can improve the fluidity in the molten state while maintaining the strength.

상기 티타늄(Ti)과 상기 보론(B) 중 보론(B)이 과다하게 첨가되어 알루미늄-마그네슘(Al-Mg) 합금의 결정립을 미세화하는 성분이 2.5 wt%를 초과하게 되면, TiB2가 과도하게 생성되어 유동성은 향상시키지만 기계적 강도를 저하시킬 수 있다.When excessive amounts of boron (B) are added in the titanium (Ti) and the boron (B) to refine the grains of the aluminum-magnesium (Al-Mg) alloy to exceed 2.5 wt%, the TiB 2 is excessively Can be produced to improve flowability but lower mechanical strength.

상기와 같은 조성비에 의하여 알루미늄-마그네슘(Al-Mg) 합금을 형성하게 되면, 용융 상태에서의 유동도 및 기계적 강도를 향상시킬 수 있다.When the aluminum-magnesium (Al-Mg) alloy is formed by the composition ratio as described above, the fluidity and mechanical strength in the molten state can be improved.

즉, 티타늄(Ti) 및 보론(B)을 첨가하지 않은 경우 유동도가 4.78cm, 강도가 98Hv인데 비하여, 티타늄(Ti) 및 보론(B)을 첨가한 본 발명의 경우 8.705cm의 유동도 및 124.3Hv의 강도를 나타낸다.That is, the flow rate of 4.78cm and the strength is 98Hv when not added titanium (Ti) and boron (B), the flow rate of 8.705cm in the case of the present invention added titanium (Ti) and boron (B) and 124.3 Hv intensity.

여기서, 상기 유동도는 내경이 2mm의 유리관을 이용하여 1atm의 기압으로 용융 상태의 알루미늄-마그네슘(Al-Mg) 합금을 추출할 때를 나타내며, 금속의 유동도에 대한 측정단위는 규격화된 단위가 없어 임의로 cm로 표시한 것이다.Here, the flow rate represents a time when a molten aluminum-magnesium (Al-Mg) alloy is extracted at a pressure of 1 atm using a glass tube having an inner diameter of 2 mm, and the unit of measurement for the flow rate of the metal is a standardized unit. It is randomly expressed in cm.

상기와 같은 알루미늄-마그네슘(Al-Mg) 합금에 의하면, 용융 상태에서의 알루미늄-마그네슘(Al-Mg) 합금의 유동도를 증가시켜 다이캐스팅 공정 중 알루미늄-마그네슘(Al-Mg) 합금 내에 기포 발생에 의한 기공 형성을 억제하여 알루미늄-마그네슘(Al-Mg) 합금의 기계적 강도 향상 및 제품의 형상 구현을 용이하게 할 수 있는 장점이 있다.According to the aluminum-magnesium (Al-Mg) alloy as described above, it is possible to increase the flow rate of the aluminum-magnesium (Al-Mg) alloy in the molten state to prevent bubbles in the aluminum-magnesium (Al-Mg) alloy during the die casting process. By suppressing the pore formation by the aluminum-magnesium (Al-Mg) has the advantage that can facilitate the mechanical strength of the alloy and implement the shape of the product.

Claims (3)

알루미늄-마그네슘 합금(Al-Mg alloy)에 있어서,In Al-Mg alloy, 상기 알루미늄-마그네슘 합금(Al-Mg alloy) 내에는 0.1~2.5 wt% 의 결정립을 미세화하는 성분이 포함되되,The aluminum-magnesium alloy (Al-Mg alloy) includes a component to refine the grain size of 0.1 ~ 2.5 wt%, 상기 결정립을 미세화하는 성분은 티타늄(Ti) 및 보론(B)을 포함하는 것을 특징으로 하는 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy).A component for miniaturizing the crystal grains is aluminum-magnesium alloy (Al-Mg alloy) for interior and exterior materials, characterized in that it comprises titanium (Ti) and boron (B). 청구항 1에 있어서,The method according to claim 1, 상기 티타늄은 0.1~1.5 wt%, 상기 보론(B)은 0.002~1.0 wt%가 포함되는 것을 특징으로 하는 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy).The titanium is 0.1 ~ 1.5 wt%, the boron (B) is an aluminum-magnesium alloy (Al-Mg alloy) for interior and exterior materials characterized in that it contains 0.002 ~ 1.0 wt%. 청구항 2에 있어서,The method according to claim 2, 7.0~10.0 wt% 의 마그네슘(Mg) 및 0.9~1.5 wt% 의 실리콘(Si)이 포함되는 것을 특징으로 하는 내외장재용 알루미늄-마그네슘 합금(Al-Mg alloy).Al-Mg alloy for interior and exterior materials, characterized in that 7.0 to 10.0 wt% of magnesium (Mg) and 0.9 to 1.5 wt% of silicon (Si).
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WO2018012798A1 (en) * 2016-07-12 2018-01-18 한국기계연구원 Grain refiner for magnesium alloy, method for preparing same, and grain refinement method for magnesium alloy
US10072322B2 (en) 2014-11-19 2018-09-11 Hyundai Motor Company Aluminum alloy having excellent formability and elasticity and method of producing the same

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CN1285746C (en) * 2005-01-27 2006-11-22 山东大学 Alumina-magnesia-titanium-boron alloy and its preparation process
CN100473735C (en) * 2007-09-29 2009-04-01 深圳市富亿通精密科技有限公司 High electric-conductivity heat-conductivity high-strength aluminum alloy material, preparation method and application thereof

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* Cited by examiner, † Cited by third party
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US10072322B2 (en) 2014-11-19 2018-09-11 Hyundai Motor Company Aluminum alloy having excellent formability and elasticity and method of producing the same
US10184163B2 (en) 2014-11-19 2019-01-22 Hyundai Motor Company Aluminum alloy having excellent formability and elasticity and method of producing the same
WO2018012798A1 (en) * 2016-07-12 2018-01-18 한국기계연구원 Grain refiner for magnesium alloy, method for preparing same, and grain refinement method for magnesium alloy

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