WO2013105831A1 - Al-zn alloy with high thermal conductivity for die casting - Google Patents

Al-zn alloy with high thermal conductivity for die casting Download PDF

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Publication number
WO2013105831A1
WO2013105831A1 PCT/KR2013/000271 KR2013000271W WO2013105831A1 WO 2013105831 A1 WO2013105831 A1 WO 2013105831A1 KR 2013000271 W KR2013000271 W KR 2013000271W WO 2013105831 A1 WO2013105831 A1 WO 2013105831A1
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aluminum alloy
thermal conductivity
weight
present
alloy
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PCT/KR2013/000271
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French (fr)
Korean (ko)
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김기태
신제식
고세현
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한국생산기술연구원
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Priority claimed from KR1020120003806A external-priority patent/KR101418773B1/en
Priority claimed from KR1020120091082A external-priority patent/KR101469613B1/en
Application filed by 한국생산기술연구원 filed Critical 한국생산기술연구원
Publication of WO2013105831A1 publication Critical patent/WO2013105831A1/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
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent

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  • the present invention relates to a high thermal conductivity aluminum alloy for die casting, and more particularly, to an aluminum alloy having excellent castability and at the same time excellent thermal conductivity.
  • Die casting also known as die casting, is a precision casting method in which molten metal is injected into steel molds that are precisely machined to perfectly match the required casting shape, thereby obtaining the same casting as the molds. Products manufactured by casting are called diecast castings.
  • Die-cast castings are precisely dimensioned, so they rarely need to be trimmed. They also have excellent mechanical properties and mass production.
  • Metals used in such die casting casting are generally alloys of zinc, aluminum, tin, copper, magnesium, and the like, and these alloys are melted and made into molten metal, and then dies of die casting apparatuses are formed through pressurization devices such as air pressure, hydraulic pressure, and hydraulic pressure. It is injected into and solidified rapidly.
  • Die-casting castings made through this process are used in various fields such as electrical equipment, optical equipment, vehicles, weaving machines, construction, measuring instruments, and are particularly applied to automobile parts.
  • Al-Si type alloy, Al-Mg type alloy, etc. which are excellent in castability conventionally are mainly used.
  • Al-Si alloys or Al-Mg alloys because of their excellent castability but low thermal conductivity of 90 to 130 W / mK, heat dissipation for electric, electronic and automobiles requiring high thermal conductivity of 160 W / mK or higher Parts have been limited in use.
  • the present invention has been made in order to solve the above problems, by adding zinc (Zn) as the main alloying elements and by controlling the content of magnesium (Mg) and iron (Fe), excellent mechanical properties and excellent notes compared to pure aluminum It is an object of the present invention to provide a die-casting aluminum alloy having a composition and a thermal conductivity of 160 W / mK or more.
  • the present invention includes 1.0 to 4.5% by weight of zinc (Zn), 0.5 to 1.6% by weight of iron (Fe) and 0.1 to 1.5% by weight of magnesium (Mg), with the remainder being aluminum (Al). It provides an aluminum alloy for die casting consisting of and inevitable impurities.
  • the content of zinc (Zn) is 1.0 to 2.0% by weight
  • the content of iron (Fe) is 0.8 to 1.5% by weight
  • the content of magnesium (Mg) is 0.5 to 1.0% by weight Can be.
  • the content of zinc (Zn) may be 3.0 to 4.5% by weight.
  • the aluminum alloy according to the present invention may have a thermal conductivity of 160 W / mK or more.
  • the aluminum alloy according to the present invention may have a thermal conductivity of 180 W / mK or more.
  • T (T L -T S ), which is a difference between the liquidus temperature T L and the solidus temperature T S , which is an index indicating castability, may be 45 ° C. or less.
  • the heat of fusion (H) which is another index indicating castability may be 280 J / g or more.
  • the tensile strength of the aluminum alloy according to the present invention may be 100 MPa or more.
  • the tensile strength of the aluminum alloy according to the present invention may be 150 MPa or more.
  • the aluminum alloy according to the present invention may include an MgZn 2 compound and an Al-Fe compound dispersed in a microstructure.
  • the aluminum alloy according to the present invention by controlling the composition of magnesium (Mg) and iron (Fe) while using zinc (Zn) as a main alloying element, to ensure sufficient castability required to obtain a sound casting in the die casting casting method and At the same time, it realizes excellent thermal conductivity of 160W / mK and tensile strength of about 100MPa to 230MPa, so it can be suitably used for the manufacture of heat dissipating parts for electric, electronic and automotive requiring high thermal conductivity and requiring a considerable level of mechanical strength. .
  • FIG. 1 is a photograph of a flow field measuring apparatus for evaluating the castability of an aluminum alloy according to the present invention.
  • the aluminum alloy according to the present invention is a high thermal conductivity aluminum alloy for die casting in which zinc (Zn), iron (Fe) and magnesium (Mg) are alloyed, and includes 1.0 to 4.5% by weight of zinc (Zn) and 0.5 to iron (Fe). 1.6% by weight and magnesium (Mg) 0.1 to 1.5% by weight, the remainder is composed of aluminum (Al) and unavoidable impurities.
  • the thermal conductivity of the alloy element which can improve the castability of aluminum and the alloy element which can be dissolved in the aluminum base metal to obtain a solid solution effect, and the solubility in the aluminum base metal are very low.
  • an alloy element that can minimize the degradation in combination it is characterized by excellent castability and tensile strength of about 100MPa ⁇ 230MPa and at the same time good thermal conductivity of 160W / mK or more.
  • Zinc (Zn) is an alloying element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to solid-solution strengthening effects.
  • zinc is added in an amount of 1.0 to 4.5% by weight. If the content of zinc is less than 1.0% by weight, casting defects are likely to occur due to poor castability, and some unmolded parts are generated. It is because when it exceeds weight%, the thermal conductivity of the cast alloy will fall, and thermal conductivity of 160 W / mK or more cannot be obtained.
  • Iron (Fe) increases the strength while minimizing the degree of the aluminum heat transfer degradation are added to the aluminum because it crystallizes as an intermetallic compound, such as solubility is then so low that the casting as 0.052% by weight, most Al 3 Fe in aluminum at room temperature It is an alloy element that can be made, and at the same time to reduce the mold adhesion when forming an aluminum alloy product by die casting.
  • iron is preferably added in an amount of 0.5 to 1.6% by weight. When the iron content is less than 0.5% by weight, the effect of preventing mold quenching is lowered, so that a part of the mold is formed when the product is formed by die casting.
  • Fe-rich phase When sintering of the product occurs and mechanical strength is not sufficient, when the iron content exceeds 1.6% by weight, the Fe-rich phase (Fe-rich phase) is excessively crystallized in the cast alloy, thereby decreasing the castability of the alloy. Because it is. More preferred content of iron (Fe) is 0.5 to 1.5% by weight.
  • Magnesium (Mg) is an element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to solid solution strengthening effects.
  • Unavoidable impurities mean impurities that are inadvertently incorporated by a raw material or a manufacturing apparatus in the process of manufacturing an alloy according to the present invention, and may include, for example, Ti, Cr, V, Mn, Li, Zr, and the like. Each component of these impurities is kept at 0.1 wt% or less, preferably 0.01 wt% or less, so as not to affect the alloy properties.
  • a high thermal conductivity Al-Zn alloy for die casting according to an embodiment of the present invention will be described in detail with reference to Tables 1 to 3 below.
  • the inventors of the present invention prepared a test piece by using a melt-stirred aluminum alloy manufacturing method commonly used in the production of the alloy for die casting alloy having a composition shown in Table 1 to produce a high thermal conductivity Al-Zn alloy for die casting.
  • thermal conductivity which is one of the main objects of the alloy according to the embodiment of the present invention.
  • thermal conductivity first, by measuring the conductivity at room temperature using a conductivity meter, and then converted to the conversion formula of the following formula [1] Thermal conductivity was obtained.
  • the alloy molten metal was injected into a fluid test mold as shown in FIG. After the flow was measured, the flow field was measured by measuring the length of solidification, and the size ( ⁇ T) of the solid-liquid coexistence region was measured by measuring the difference between the liquidus temperature and the solidus temperature using a thermal analyzer.
  • the aluminum alloys according to the embodiments (Nos. 1 to 7) of the present invention all exhibit very high thermal conductivity with a thermal conductivity of 180 W / mK or more, and the embodiment of the present invention (No.
  • the aluminum alloys according to 8 to 11 also have excellent thermal conductivity of 160 W / mK or more, so that the aluminum alloys according to the embodiment of the present invention have excellent thermal conductivity at or above the level required for various heat dissipation parts.
  • ⁇ T which is the difference between the flow field, the liquidus temperature, and the solidus temperature
  • ⁇ T is an important indicator for evaluating the castability of the alloy.
  • the aluminum alloys according to Examples 1 to 3 of the present invention have excellent flowability as the length of the flow field is all 780 mm (the maximum value of the flow field evaluation device evaluated in the embodiment of the present invention is 780 mm). It was confirmed that it represents.
  • ⁇ T (T L -T S ) and the heat of fusion (H), which are the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of the aluminum alloy shown in Table 2, are a major factor for evaluating the castability of the alloy.
  • the index, ⁇ T (T L -T S ), which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ), means that the smaller the castability, the better the castability. Means that.
  • Equation 2 shows the flow distance Lf which is an index for evaluating castability at the time of casting of the alloy. It can be seen that the flow distance Lf is inversely proportional to ⁇ T (T L -T S ), which is the difference between the liquidus temperature T L and the solidus temperature T S , and is proportional to the heat of fusion H.
  • ⁇ T (T L -T S ) which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of the aluminum alloys according to Examples 1 to 11 of the present invention, is 23 to 41 ° C., which is a die casting aluminum alloy.
  • ⁇ T (T L -T S ) 74 ° C, which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of Comparative Example Alloy 15, a widely used Al-Si alloy (ADC 12) to be.
  • the heat of fusion of the aluminum alloy according to Examples 4 to 11 of the present invention is 283 to 343 J / g, and the heat of fusion 311J of Comparative Example Alloy 15, which is an Al-Si alloy (ADC 12) widely used as an aluminum alloy for die casting. This is equivalent to / g.
  • the aluminum alloys according to Examples 1 to 11 of the present invention have castability equivalent to that of Al-Si alloys widely used in conventional die casting.
  • Comparative Example 12 has a low zinc content of 0.3% by weight compared to the embodiments of the present invention, as a result of the flow field is 710mm, compared to the embodiments of the present invention is inferior castability.
  • Comparative Example 13 has a high iron content of 2.0% by weight compared to the embodiments of the present invention, as a result, the flow field is low as 670 mm, significantly lower castability than the embodiments of the present invention.
  • Comparative Example 14 has a magnesium content as low as 0.1% by weight compared to the embodiments of the present invention, as a result, the flow field is as low as 680mm, significantly lower castability than the embodiments of the present invention.
  • Comparative Example 16 has a high zinc content of 5.92% by weight and a high magnesium content of 2.08% by weight compared to the embodiments of the present invention.
  • the thermal conductivity is low as 129W / mK and the liquidus temperature (T L ) ⁇ T (T L -T S ), which is the difference between the solid phase temperature and T S , is also high at 63 ° C. and the heat of melting (H) is low at 249 J / g, which is inferior to the embodiments of the present invention.
  • Comparative Example 17 has a high zinc content of 6.10% by weight compared to the embodiments of the present invention. As a result, the thermal conductivity is only 137 W / mK, and thus it is difficult to be used in a heat dissipation component requiring good thermal conductivity.
  • Comparative Example 18 is a high iron content of 1.63% by weight compared to the embodiments of the present invention, as a result of the heat of fusion (H) is low as 212J / g, castability is inferior to the embodiments of the present invention.
  • Table 3 below shows the tensile test results of the test specimens prepared from the alloys of Examples 1 to 11 and Comparative Examples 15 to 18 alloys of the present invention.
  • the alloys according to Examples 1 to 7 of the present invention exhibit a significantly higher thermal conductivity than conventional Al-Si alloys (ADC 12, Comparative Example 15), and also in tensile properties. It exhibits a slightly lower level of tensile strength (106 to 127 MPa) than Al-Si alloys (ADC 12, Comparative Example 15), and can be suitably used for parts requiring excellent thermal conductivity with tensile strength of 100 MPa or more.
  • the alloy according to Examples 8 to 11 of the present invention has a higher level of tensile strength (148 to 225 MPa) than the existing Al-Si alloy (ADC 12, Comparative Example 15), which is widely used as an aluminum alloy for die casting. It can be used suitably for parts requiring good castability and thermal conductivity with a certain level of strength.
  • the aluminum alloy according to the embodiment of the present invention is suitably used as a die-casting aluminum material for heat-dissipating parts that require a certain level of tensile strength and excellent thermal conductivity properties with a castability capable of die casting. It can be seen that.

Abstract

The present invention relates to an aluminum alloy for die casting which can have excellent thermal conductivity while having excellent casting property and satisfactory mechanical properties, and thus can be applied to various structural products requiring radiation characteristics. According to the present invention, the aluminum alloy for die casting consists of 1.0-4.5 wt% of zinc (Zn), 0.5-1.6 wt% of iron (Fe), 0.1-1.5 wt% of magnesium (Mg), and the balance of aluminum (Al) and inevitable impurities.

Description

다이캐스팅용 고열전도도 Ａｌ-Ｚｎ 합금 High Thermal Conductivity Ａｌ-Ｚｎ Alloy for Die Casting
본 발명은 다이캐스팅용 고열전도도 알루미늄 합금에 관한 것으로서, 특히 우수한 주조성을 가지면서 동시에 우수한 열전도도를 얻을 수 있는 알루미늄 합금에 관한 것이다.      BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high thermal conductivity aluminum alloy for die casting, and more particularly, to an aluminum alloy having excellent castability and at the same time excellent thermal conductivity.
다이캐스팅은 다이 주조라고도 하며, 필요한 주조형상에 완전히 일치하도록 정확하게 기계가공된 강제(鋼製)의 금형(金型)에 용융금속(熔融金屬)을 주입하여 금형과 똑같은 주물을 얻는 정밀주조법이며, 이 주조법을 통해 제조한 제품을 다이캐스트 주물이라고 한다.Die casting, also known as die casting, is a precision casting method in which molten metal is injected into steel molds that are precisely machined to perfectly match the required casting shape, thereby obtaining the same casting as the molds. Products manufactured by casting are called diecast castings.
다이캐스트 주물은 치수가 정확하므로 다듬질할 필요가 거의 없는 장점 외에 기계적 성질이 우수하며, 대량생산이 가능하다는 특징이 있다.Die-cast castings are precisely dimensioned, so they rarely need to be trimmed. They also have excellent mechanical properties and mass production.
이러한 다이캐스팅 주조에 이용되는 금속은 일반적으로 아연, 알루미늄, 주석, 구리, 마그네슘 등의 합금이며, 이들 합금은 용융되어 용탕으로 만들어진 후, 공기압, 수압, 유압 등의 가압장치를 통해 다이캐스트 장치의 금형에 주입되어 급속 냉각 응고된다.Metals used in such die casting casting are generally alloys of zinc, aluminum, tin, copper, magnesium, and the like, and these alloys are melted and made into molten metal, and then dies of die casting apparatuses are formed through pressurization devices such as air pressure, hydraulic pressure, and hydraulic pressure. It is injected into and solidified rapidly.
이러한 과정을 통해 만들어진 다이캐스팅 주조품은 전기기기, 광학기기, 차량, 방직기, 건축, 계측기 등 여러 분야에 사용되고 있으며, 특히 자동차부품에 많이 적용되고 있다.Die-casting castings made through this process are used in various fields such as electrical equipment, optical equipment, vehicles, weaving machines, construction, measuring instruments, and are particularly applied to automobile parts.
한편, 다이캐스팅용 알루미늄 합금으로는 종래 주조성이 우수한 Al-Si계 합금 및 Al-Mg계 합금 등이 주로 사용되고 있다. 그런데 Al-Si계 합금 또는 Al-Mg계 합금의 경우, 주조성은 우수하나 열전도도가 90~130W/mK로 낮기 때문에, 160W/mK 이상의 높은 열전도도를 필요로 하는 전기, 전자 및 자동차용 방열부품에는 사용이 제한되어 왔다.On the other hand, as an aluminum alloy for die casting, Al-Si type alloy, Al-Mg type alloy, etc. which are excellent in castability conventionally are mainly used. However, in the case of Al-Si alloys or Al-Mg alloys, because of their excellent castability but low thermal conductivity of 90 to 130 W / mK, heat dissipation for electric, electronic and automobiles requiring high thermal conductivity of 160 W / mK or higher Parts have been limited in use.
이와 같은 높은 열전도도를 요구하는 방열부품에는, 종래 열전도도가 220W/mK 이상으로 매우 높은 순 알루미늄을 그대로 다이캐스팅한 제품이 전기, 전자제품용 로터(rotor) 등에 일부 사용되고 있는데, 순 알루미늄은 열전도도는 매우 우수하지만 인장 강도가 낮고 주조성이 좋지 않기 때문에, 복잡한 부품이나 열전도도와 함께 상당한 기계적 특성까지 요구하는 구조용 부품에까지는 적용할 수 없는 한계가 있다.For heat dissipation parts that require such high thermal conductivity, products that are die-cast as pure aluminum, which has a high thermal conductivity of 220 W / mK or higher, are partially used in rotors for electrical and electronic products. Pure aluminum is used for thermal conductivity. Is very good but has low tensile strength and poor castability, so there is a limitation that it cannot be applied to structural parts requiring complicated mechanical parts or thermal conductivity and considerable mechanical properties.
이에 따라, 전기, 전자 및 자동차용 방열부품 등에 사용하기 위하여 우수한 주조성을 가지면서 동시에 160W/mK 이상의 높은 열전도도를 갖는 다이캐스팅용 알루미늄 합금 개발에 대한 필요성이 절실히 요구되고 있지만, 현재까지는 우수한 주조성을 가지면서 동시에 160W/mK 이상의 열전도도를 갖는 다이캐스팅용 알루미늄 합금이 개발되지 못한 상태이므로, 열전도도가 90~130W/mK인 Al-Si계 합금 및 Al-Mg계 합금 등이 다이캐스팅용 알루미늄 합금으로 사용되고 있는 실정이다.Accordingly, there is an urgent need for development of die casting aluminum alloys having excellent castability and high thermal conductivity of 160W / mK or more for use in heat dissipating parts for electric, electronic and automotive applications. At the same time, the die-casting aluminum alloy having a thermal conductivity of 160W / mK or more has not been developed. Therefore, Al-Si alloys and Al-Mg alloys having thermal conductivity of 90 to 130W / mK are used as the die casting aluminum alloys. It is true.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출한 것으로서 아연(Zn)을 주 합금원소로 첨가하고 마그네슘(Mg)과 철(Fe)의 함량을 조절하여, 순 알루미늄에 비해 우수한 기계적 성질과 우수한 주조성을 가지면서 동시에 160W/mK 이상의 열전도도를 갖는 다이캐스팅용 알루미늄 합금을 제공하는 것을 해결하고자 하는 과제로 한다.The present invention has been made in order to solve the above problems, by adding zinc (Zn) as the main alloying elements and by controlling the content of magnesium (Mg) and iron (Fe), excellent mechanical properties and excellent notes compared to pure aluminum It is an object of the present invention to provide a die-casting aluminum alloy having a composition and a thermal conductivity of 160 W / mK or more.
상기의 과제의 해결수단으로 본 발명은, 아연(Zn) 1.0~4.5중량%, 철(Fe) 0.5~1.6중량% 및 마그네슘(Mg) 0.1~1.5중량%를 포함하고, 나머지는 알루미늄(Al)과 불가피한 불순물로 이루어진 다이캐스팅용 알루미늄 합금을 제공한다.In order to solve the above problems, the present invention includes 1.0 to 4.5% by weight of zinc (Zn), 0.5 to 1.6% by weight of iron (Fe) and 0.1 to 1.5% by weight of magnesium (Mg), with the remainder being aluminum (Al). It provides an aluminum alloy for die casting consisting of and inevitable impurities.
또한, 본 발명에 따른 알루미늄 합금에서, 상기 아연(Zn)의 함량은 1.0~2.0중량%, 철(Fe)의 함량은 0.8~1.5중량%, 마그네슘(Mg)의 함량은 0.5~1.0중량%일 수 있다.In addition, in the aluminum alloy according to the present invention, the content of zinc (Zn) is 1.0 to 2.0% by weight, the content of iron (Fe) is 0.8 to 1.5% by weight, the content of magnesium (Mg) is 0.5 to 1.0% by weight Can be.
또한, 본 발명에 따른 알루미늄 합금에서, 상기 아연(Zn)의 함량이 3.0~4.5중량%일 수 있다.In addition, in the aluminum alloy according to the present invention, the content of zinc (Zn) may be 3.0 to 4.5% by weight.
또한, 본 발명에 따른 알루미늄 합금은, 열전도도가 160W/mK 이상일 수 있다.In addition, the aluminum alloy according to the present invention may have a thermal conductivity of 160 W / mK or more.
또한, 본 발명에 따른 알루미늄 합금은, 열전도도가 180W/mK 이상일 수 있다.In addition, the aluminum alloy according to the present invention may have a thermal conductivity of 180 W / mK or more.
또한, 본 발명에 따른 알루미늄 합금은, 주조성을 나타내는 지표인 액상온도(TL)와 고상온도(TS)의 차이인 T(TL-TS)는 45℃ 이하일 수 있다.In addition, in the aluminum alloy according to the present invention, T (T L -T S ), which is a difference between the liquidus temperature T L and the solidus temperature T S , which is an index indicating castability, may be 45 ° C. or less.
또한, 본 발명에 따른 알루미늄 합금은, 주조성을 나타내는 다른 지표인 용융열(H)이 280J/g 이상일 수 있다.In addition, in the aluminum alloy according to the present invention, the heat of fusion (H) which is another index indicating castability may be 280 J / g or more.
또한, 본 발명에 따른 알루미늄 합금의 인장강도는 100 MPa 이상일 수 있다.In addition, the tensile strength of the aluminum alloy according to the present invention may be 100 MPa or more.
또한, 본 발명에 따른 알루미늄 합금의 인장강도는 150 MPa 이상일 수 있다.In addition, the tensile strength of the aluminum alloy according to the present invention may be 150 MPa or more.
또한, 본 발명에 따른 알루미늄 합금은, 미세조직 내에 분산된 MgZn2 화합물과 Al-Fe화합물을 포함할 수 있다.In addition, the aluminum alloy according to the present invention may include an MgZn 2 compound and an Al-Fe compound dispersed in a microstructure.
본 발명에 따른 알루미늄 합금은, 아연(Zn)을 주 합금원소로 하면서 마그네슘(Mg)과 철(Fe)의 성분 제어를 통해, 다이캐스팅 주조법에서 건전한 주물을 얻을 수 있는데 요구되는 충분한 주조성을 확보함과 동시에, 160W/mK 이상의 우수한 열전도도와 100MPa ~ 230MPa 정도의 인장강도를 구현하여, 높은 열전도도를 요구하면서 상당한 수준의 기계적 강도를 요하는 전기, 전자 및 자동차용 방열부품의 제조에 적합하게 사용될 수 있다.The aluminum alloy according to the present invention, by controlling the composition of magnesium (Mg) and iron (Fe) while using zinc (Zn) as a main alloying element, to ensure sufficient castability required to obtain a sound casting in the die casting casting method and At the same time, it realizes excellent thermal conductivity of 160W / mK and tensile strength of about 100MPa to 230MPa, so it can be suitably used for the manufacture of heat dissipating parts for electric, electronic and automotive requiring high thermal conductivity and requiring a considerable level of mechanical strength. .
도 1은 본 발명에 따른 알루미늄 합금의 주조성을 평가하기 위한 유동장 측정장치의 사진이다.1 is a photograph of a flow field measuring apparatus for evaluating the castability of an aluminum alloy according to the present invention.
이하 본 발명의 바람직한 실시예에 따른 알루미늄 합금에 대하여 상세하게 설명하겠지만 본 발명이 하기의 실시예에 제한되는 것은 아니다. 따라서 해당 분야에서 통상의 지식을 가진 자라면 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 본 발명을 다양하게 변경할 수 있음은 자명하다.Hereinafter, an aluminum alloy according to a preferred embodiment of the present invention will be described in detail, but the present invention is not limited to the following examples. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified without departing from the technical spirit of the present invention.
또한, 본 발명의 실시예를 설명하기 위해 사용되는 단수 형태들은 문구들이 이와 명백히 반대의 의미를 나타내지 않는 한 복수 형태들도 포함하는 것을 의미한다.Also, the singular forms used to describe the embodiments of the present invention are intended to include the plural forms as well, unless the phrases clearly indicate the opposite.
본 발명에 의한 알루미늄 합금은, 아연(Zn), 철(Fe) 및 마그네슘(Mg)이 합금되어 구성된 다이캐스팅용 고열전도도 알루미늄 합금으로서, 아연(Zn) 1.0~4.5중량%, 철(Fe) 0.5~1.6중량% 및 마그네슘(Mg) 0.1~1.5중량%를 포함하고, 나머지는 알루미늄(Al)과 불가피한 불순물로 구성된다.The aluminum alloy according to the present invention is a high thermal conductivity aluminum alloy for die casting in which zinc (Zn), iron (Fe) and magnesium (Mg) are alloyed, and includes 1.0 to 4.5% by weight of zinc (Zn) and 0.5 to iron (Fe). 1.6% by weight and magnesium (Mg) 0.1 to 1.5% by weight, the remainder is composed of aluminum (Al) and unavoidable impurities.
본 발명은 상기 각각의 조성량에 따라서 알루미늄의 주조성을 향상시킬 수 있는 합금원소와 알루미늄 기지 금속에 고용되어 고용강화 효과를 얻을 수 있는 합금원소, 그리고 알루미늄 기지 금속에의 고용도가 매우 낮아서 열전도도 저하를 최소화할 수 있는 합금원소를 복합적으로 첨가함으로써, 우수한 주조성과 100MPa ~ 230MPa 정도의 인장강도를 나타내면서 동시에 160W/mK 이상의 양호한 열전도도를 나타낼 수 있도록 한 것에 특징이 있다.According to the present invention, the thermal conductivity of the alloy element which can improve the castability of aluminum and the alloy element which can be dissolved in the aluminum base metal to obtain a solid solution effect, and the solubility in the aluminum base metal are very low. By adding an alloy element that can minimize the degradation in combination, it is characterized by excellent castability and tensile strength of about 100MPa ~ 230MPa and at the same time good thermal conductivity of 160W / mK or more.
상기 각 합금원소의 첨가 및 함량 한정 이유는 다음과 같다.The reason for the addition and content limitation of each alloying element is as follows.
아연(Zn)은 알루미늄에 합금원소로 첨가되어 주조성을 향상시키고 고용강화 효과에 따라서 인장강도를 증가시킬 수 있는 합금원소이다. 본 발명에 의한 합금에는 아연이 1.0~4.5중량% 첨가되는 것이 바람직한데, 이는 아연의 함량이 1.0중량% 미만이면 주조성이 떨어져 일부 미성형부가 발생하는 주조 결함이 생기기 쉽고, 아연의 함량이 4.5중량% 초과하면, 주조된 합금의 열전도도가 저하되어 160W/mK 이상의 열전도도를 얻을 수 없기 때문이다.Zinc (Zn) is an alloying element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to solid-solution strengthening effects. In the alloy according to the present invention, it is preferable that zinc is added in an amount of 1.0 to 4.5% by weight. If the content of zinc is less than 1.0% by weight, casting defects are likely to occur due to poor castability, and some unmolded parts are generated. It is because when it exceeds weight%, the thermal conductivity of the cast alloy will fall, and thermal conductivity of 160 W / mK or more cannot be obtained.
또한, 본 발명에 따른 알루미늄 합금에서, 상기 아연(Zn) 함량 1.0~2.0중량%, 철(Fe) 함량 0.8~1.5중량%, 마그네슘(Mg) 함량 0.5~1.0중량%로 포함할 경우, 180W/mK 이상의 높은 열전도도와 함께 100MPa 이상의 상당한 강도를 구현할 수 있어 강도보다는 열전도도가 더 요구되는 부품에 적합하게 사용될 수 있다.In addition, in the aluminum alloy according to the present invention, the zinc (Zn) content of 1.0 to 2.0% by weight, iron (Fe) content of 0.8 to 1.5% by weight, magnesium (Mg) content of 0.5 to 1.0% by weight, 180 W / Significant strength of 100 MPa or more with high thermal conductivity of mK or higher can be achieved, making it suitable for parts requiring more thermal conductivity than strength.
또한, 상기 아연(Zn)의 함량이 3.0~4.5중량%일 경우, 알루미늄 합금의 열전도도를 160W/mK 이상으로 양호한 수준으로 유지하면서, 200MPa 이상의 높은 강도를 구현할 수 있어, 적절한 열전도도와 함께 높은 강도가 요구되는 부품에 적합하게 사용될 수 있다.In addition, when the content of zinc (Zn) is 3.0 ~ 4.5% by weight, while maintaining the thermal conductivity of the aluminum alloy at a good level of 160W / mK or more, high strength of 200MPa or more can be achieved, high strength with appropriate thermal conductivity Can be suitably used for the required parts.
철(Fe)은 상온에서 알루미늄에의 고용도가 0.052중량%로서 매우 낮아 주조 후에는 대부분 Al3Fe 등의 금속간화합물로 정출되기 때문에 알루미늄에 첨가되어 알루미늄의 열전도도 저하를 최소화하면서 강도를 증가시킬 수 있고, 동시에 다이캐스팅에 의하여 알루미늄 합금 제품을 성형할 때에 금형소착을 줄일 수 있도록 하는 합금원소이다. 본 발명에 의한 다이캐스팅용 합금에는 철이 0.5~1.6중량% 첨가되는 것이 바람직한데, 이는, 상기 철의 함량이 0.5중량% 미만이면 금형소착 방지 효과가 낮아져 다이캐스팅에 의하여 제품을 성형할 때에 일부 금형부위에 제품의 소착현상이 발생하고 기계적 강도도 충분하지 못하게 되고, 상기 철의 함량이 1.6중량% 초과하면 주조 합금내에서 Fe-부화상(Fe-rich상)이 과도하게 정출되어, 합금의 주조성을 저하시키기 때문이다. 보다 바람직한 철(Fe)의 함량은 0.5~1.5중량%이다.Iron (Fe) increases the strength while minimizing the degree of the aluminum heat transfer degradation are added to the aluminum because it crystallizes as an intermetallic compound, such as solubility is then so low that the casting as 0.052% by weight, most Al 3 Fe in aluminum at room temperature It is an alloy element that can be made, and at the same time to reduce the mold adhesion when forming an aluminum alloy product by die casting. In the die casting alloy according to the present invention, iron is preferably added in an amount of 0.5 to 1.6% by weight. When the iron content is less than 0.5% by weight, the effect of preventing mold quenching is lowered, so that a part of the mold is formed when the product is formed by die casting. When sintering of the product occurs and mechanical strength is not sufficient, when the iron content exceeds 1.6% by weight, the Fe-rich phase (Fe-rich phase) is excessively crystallized in the cast alloy, thereby decreasing the castability of the alloy. Because it is. More preferred content of iron (Fe) is 0.5 to 1.5% by weight.
마그네슘(Mg)은 알루미늄에 합금원소로 첨가되어 주조성을 향상시키고 고용강화 효과에 따라서 인장강도를 증가시킬 수 있는 원소이다. 본 발명에 의한 다이캐스팅용 알루미늄 합금에는 마그네슘이 0.1~1.5중량% 첨가되는 것이 바람직한데, 이는 상기 마그네슘의 함량이 0.1중량% 미만이면 주조성이 저하되어 다이캐스팅에 의하여 제품을 성형할 때에 일부 미성형부가 발생하는 주조결함이 생기기 쉽고, 상기 마그네슘의 함량이 1.5중량% 초과하면 열전도도가 저하되어 160W/mK 이상의 열전도도를 얻을 수 없기 때문이다.Magnesium (Mg) is an element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to solid solution strengthening effects. In the die casting aluminum alloy according to the present invention, it is preferable that 0.1 to 1.5% by weight of magnesium be added. If the magnesium content is less than 0.1% by weight, castability is lowered, so that some unmolded parts are formed when the product is formed by die casting. This is because casting defects easily occur, and when the content of magnesium exceeds 1.5% by weight, the thermal conductivity is lowered, and thermal conductivity of 160 W / mK or more cannot be obtained.
불가피한 불순물이란, 본 발명에 의한 합금을 제조하는 과정에서 원료 또는 제조 장치에 의해 의도하지 않게 혼입된 불순물을 의미하며, 예를 들어 Ti, Cr, V, Mn, Li, Zr 등이 포함될 수 있고, 이들 불순물의 각 성분은 합금 특성에 영향을 주지 않도록 0.1중량% 이하, 바람직하게는 0.01중량% 이하가 되도록 유지한다.Unavoidable impurities mean impurities that are inadvertently incorporated by a raw material or a manufacturing apparatus in the process of manufacturing an alloy according to the present invention, and may include, for example, Ti, Cr, V, Mn, Li, Zr, and the like. Each component of these impurities is kept at 0.1 wt% or less, preferably 0.01 wt% or less, so as not to affect the alloy properties.
[실시예]EXAMPLE
본 발명의 실시예에 따른 다이캐스팅용 고열전도도 Al-Zn 합금에 대하여 하기 표 1 내지 3을 참조하여, 상세하게 설명한다.A high thermal conductivity Al-Zn alloy for die casting according to an embodiment of the present invention will be described in detail with reference to Tables 1 to 3 below.
본 발명자들은 다이캐스팅용 고열전도도 Al-Zn 합금을 제조하기 위해 하기 표 1에 나타낸 조성을 갖는 합금을, 다이캐스팅용 합금 제조시에 통상적으로 사용되는 용융 교반식 알루미늄 합금 제조 방법으로 시험편을 제조하였다.The inventors of the present invention prepared a test piece by using a melt-stirred aluminum alloy manufacturing method commonly used in the production of the alloy for die casting alloy having a composition shown in Table 1 to produce a high thermal conductivity Al-Zn alloy for die casting.
표 1
합금 조성(중량%)
Zn Fe Mg Si Al
실시예 1 1.00 1.04 0.54 - bal.
2 1.49 1.09 0.55 - bal.
3 1.98 1.10 0.54 - bal.
4 1.91 0.63 0.17 - bal.
5 1.98 0.97 0.41 - bal.
6 1.88 0.56 0.54 - bal.
7 1.90 0.52 0.67 - bal.
8 3.97 0.96 0.39 - bal.
9 4.05 1.02 0.83 - bal.
10 3.91 0.60 1.08 - bal.
11 3.82 0.56 1.35 - bal.
비교예 12 0.3 0.8 0.8 - bal.
13 1.3 2.0 0.5 - bal.
14 1.1 0.7 0.1 - bal.
15 0.92 0.97 0.21 10.20 bal.
16 5.92 0.60 2.08 - bal.
17 6.10 1.04 1.25 - bal.
18 1.47 1.63 0.72 - bal.
Table 1
alloy Composition (% by weight)
Zn Fe Mg Si Al
Example One 1.00 1.04 0.54 - bal.
2 1.49 1.09 0.55 - bal.
3 1.98 1.10 0.54 - bal.
4 1.91 0.63 0.17 - bal.
5 1.98 0.97 0.41 - bal.
6 1.88 0.56 0.54 - bal.
7 1.90 0.52 0.67 - bal.
8 3.97 0.96 0.39 - bal.
9 4.05 1.02 0.83 - bal.
10 3.91 0.60 1.08 - bal.
11 3.82 0.56 1.35 - bal.
Comparative example 12 0.3 0.8 0.8 - bal.
13 1.3 2.0 0.5 - bal.
14 1.1 0.7 0.1 - bal.
15 0.92 0.97 0.21 10.20 bal.
16 5.92 0.60 2.08 - bal.
17 6.10 1.04 1.25 - bal.
18 1.47 1.63 0.72 - bal.
구체적으로, 상기 표 1과 같은 조성이 되도록 알루미늄 합금의 원료를 준비한 후, 전기저항식 용해로에 장입하여 대기 중에서 원료를 용해하여 용탕을 제조한 후에, 금형을 이용하여 주조성 평가를 위한 유동성 시험편을 제조하였고 또한 열전도도, 액상 온도 및 고상 온도 등을 측정하기 위한 특성평가용 시험편을 제조하였다.Specifically, after preparing the raw material of the aluminum alloy so as to have the composition as shown in Table 1, charged into an electric resistance melting furnace to dissolve the raw material in the air to produce a molten metal, the flowability test piece for castingability evaluation using a mold In addition, a test piece for characterization for measuring thermal conductivity, liquidus temperature, and solidus temperature was prepared.
본 발명의 실시예에 따른 합금의 주목적 중 하나인 열전도도에 대해서는, 먼저 제조한 시편을 도전율 측정기를 이용하여 상온에서 도전율을 측정한 후, 하기 [식 1]의 환산식으로 환산하는 방식을 통해 열전도도를 얻었다.For the thermal conductivity, which is one of the main objects of the alloy according to the embodiment of the present invention, first, by measuring the conductivity at room temperature using a conductivity meter, and then converted to the conversion formula of the following formula [1] Thermal conductivity was obtained.
[식 1][Equation 1]
K = 5.02σT x 10-9 + 0.03K = 5.02σT x 10 -9 + 0.03
(여기서, K는 열전도도, σ는 도전율, T는 절대온도임)(Where K is thermal conductivity, σ is conductivity, and T is absolute temperature)
또한, 다이캐스팅 주조에 필수적인 주조성 평가를 위해, 합금 용탕을 200℃의 온도로 유지된 폭 12㎜, 두께 5㎜, 최대길이 780㎜의 도 1과 같은 유동성 시험 금형에 주입하고 합금 용탕이 일정한 거리를 유동한 후에 응고된 길이를 측정하는 방법으로 유동장을 측정하였으며, 또한 열분석기를 이용하여 액상 온도 및 고상 온도의 차이를 측정하는 방식으로 고액공존영역의 크기(△T)를 측정하였다.In addition, for evaluating the castability necessary for die casting casting, the alloy molten metal was injected into a fluid test mold as shown in FIG. After the flow was measured, the flow field was measured by measuring the length of solidification, and the size (ΔT) of the solid-liquid coexistence region was measured by measuring the difference between the liquidus temperature and the solidus temperature using a thermal analyzer.
하기 표 2는 각 합금의 유동장, 열전도도, 액상온도(TL), 고상온도(TS) 및 그 차이(△T=TL-TS), 용융열(H)을 측정한 결과를 나타낸 것이다.Table 2 shows the results of measuring the flow field, the thermal conductivity, the liquidus temperature (T L ), the solidus temperature (T S ) and the difference (△ T = T L -T S ), the heat of fusion (H) of each alloy will be.
표 2
합금 유동장(㎜) 열전도도(W/mK) 액상온도(℃) 고상온도(℃) △T(℃) 용융열(H)(J/g)
실시예 1 780 190 660 637 23 -
2 780 186 658 632 26 -
3 780 182 656 632 24 -
4 - 194 660 631 29 330
5 - 186 655 630 25 343
6 - 190 662 636 26 283
7 - 186 661 631 30 315
8 - 175 655 623 32 300
9 - 167 646 619 27 337
10 - 167 654 619 35 298
11 - 163 652 611 41 301
비교예 12 710 218 - - - -
13 670 204 - - - -
14 680 222 - - - -
15 - 95 575 501 74 311
16 - 129 640 577 63 249
17 - 137 646 600 46 260
18 - 175 657 625 32 212
TABLE 2
alloy Flow field (mm) Thermal Conductivity (W / mK) Liquid Temperature (℃) Solid State Temperature (℃) ΔT (℃) Heat of fusion (H) (J / g)
Example One 780 190 660 637 23 -
2 780 186 658 632 26 -
3 780 182 656 632 24 -
4 - 194 660 631 29 330
5 - 186 655 630 25 343
6 - 190 662 636 26 283
7 - 186 661 631 30 315
8 - 175 655 623 32 300
9 - 167 646 619 27 337
10 - 167 654 619 35 298
11 - 163 652 611 41 301
Comparative example 12 710 218 - - - -
13 670 204 - - - -
14 680 222 - - - -
15 - 95 575 501 74 311
16 - 129 640 577 63 249
17 - 137 646 600 46 260
18 - 175 657 625 32 212
상기 표 2에서 확인되는 바와 같이, 본 발명의 실시예(No.1~7)에 따른 알루미늄 합금들은 모두 열전도도가 180W/mK 이상으로 매우 높은 열전도도를 나타내며, 본 발명의 실시예(No.8~11)에 따른 알루미늄 합금들도 열전도도가 160W/mK 이상으로 상당히 우수하여, 본 발명의 실시예에 따른 알루미늄 합금들은 다양한 방열부품에서 요구되는 수준 또는 그 이상의 우수한 열전도도를 가진다.As confirmed in Table 2, the aluminum alloys according to the embodiments (Nos. 1 to 7) of the present invention all exhibit very high thermal conductivity with a thermal conductivity of 180 W / mK or more, and the embodiment of the present invention (No. The aluminum alloys according to 8 to 11 also have excellent thermal conductivity of 160 W / mK or more, so that the aluminum alloys according to the embodiment of the present invention have excellent thermal conductivity at or above the level required for various heat dissipation parts.
또한, 유동장과 액상 온도와 고상 온도의 차이인 △T는 합금의 주조성을 평가하는 주요한 지표인데, 유동장은 클수록 합금의 유동성이 우수한 것을 의미하며 액상 온도와 고상 온도의 차이인 △T는 작을수록 주조성이 우수한 것을 의미한다.In addition, ΔT, which is the difference between the flow field, the liquidus temperature, and the solidus temperature, is an important indicator for evaluating the castability of the alloy. The larger the flowfield, the better the fluidity of the alloy. The smaller the difference between the liquidus temperature and the solidus temperature, the smaller the ΔT. It means that the composition is excellent.
상기 표 2에서 확인되는 바와 같이, 본 발명의 실시예 1~3에 따른 알루미늄 합금들은 유동장의 길이가 모두 780mm(본 발명의 실시예에서 평가한 유동장 평가장치의 최대값이 780mm임)로 우수한 유동성을 나타냄을 확인하였다.As can be seen in Table 2, the aluminum alloys according to Examples 1 to 3 of the present invention have excellent flowability as the length of the flow field is all 780 mm (the maximum value of the flow field evaluation device evaluated in the embodiment of the present invention is 780 mm). It was confirmed that it represents.
또한, 상기 표 2에서 나타낸 알루미늄 합금의 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS)와 용융열(H)은 합금의 주조성을 평가할 수 있는 주요한 지표인데, 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS)는 작을수록 주조성이 우수한 것을 의미하며, 용융열(H)은 클수록 주조성이 우수한 것을 의미한다.In addition, ΔT (T L -T S ) and the heat of fusion (H), which are the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of the aluminum alloy shown in Table 2, are a major factor for evaluating the castability of the alloy. The index, ΔT (T L -T S ), which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ), means that the smaller the castability, the better the castability. Means that.
하기 [식 2]는 합금의 주조시에 주조성을 평가하는 지표인 유동거리(Lf)를 나타내는 것이다. 유동거리(Lf)는 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS)에 반비례하고, 용융열(H)에 비례하는 것을 알 수 있다.The following [Equation 2] shows the flow distance Lf which is an index for evaluating castability at the time of casting of the alloy. It can be seen that the flow distance Lf is inversely proportional to ΔT (T L -T S ), which is the difference between the liquidus temperature T L and the solidus temperature T S , and is proportional to the heat of fusion H.
[식 2][Equation 2]
Figure PCTKR2013000271-appb-I000001
Figure PCTKR2013000271-appb-I000001
(여기서, Lf는 유동거리, ρ는 고체밀도, H는 용융열, a는 고체직경, v는 유속, h는 열전달계수, TL은 액상온도, TS는 고상온도임)(Where Lf is the flow distance, ρ is the solid density, H is the heat of fusion, a is the solid diameter, v is the flow rate, h is the heat transfer coefficient, T L is the liquidus temperature, and T S is the solidus temperature)
본 발명의 실시예 1~11에 따른 알루미늄 합금들의 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS)는 23~41℃로, 다이캐스팅용 알루미늄 합금으로 널리 사용되고 있는 Al-Si 합금(ADC 12)인 비교예 합금 15의 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS) 74℃와 비교하여 훨씬 낮은 수준이다.ΔT (T L -T S ), which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of the aluminum alloys according to Examples 1 to 11 of the present invention, is 23 to 41 ° C., which is a die casting aluminum alloy. Much lower than ΔT (T L -T S ) 74 ° C, which is the difference between the liquidus temperature (T L ) and the solidus temperature (T S ) of Comparative Example Alloy 15, a widely used Al-Si alloy (ADC 12) to be.
또한, 본 발명의 실시예 4~11에 따른 알루미늄 합금의 용융열은 283~343J/g으로, 다이캐스팅용 알루미늄 합금으로 널리 사용되고 있는 Al-Si 합금(ADC 12)인 비교예 합금 15의 용융열 311J/g와 비교하여 동등한 수준이다.Further, the heat of fusion of the aluminum alloy according to Examples 4 to 11 of the present invention is 283 to 343 J / g, and the heat of fusion 311J of Comparative Example Alloy 15, which is an Al-Si alloy (ADC 12) widely used as an aluminum alloy for die casting. This is equivalent to / g.
다시 말해, 본 발명의 실시예 1~11에 따른 알루미늄 합금은 종래 다이캐스팅에서 널리 사용되는 Al-Si 합금과 동등한 수준의 주조성을 갖는다.In other words, the aluminum alloys according to Examples 1 to 11 of the present invention have castability equivalent to that of Al-Si alloys widely used in conventional die casting.
한편, 비교예 12는 본 발명의 실시예들에 비해, 아연 함량이 0.3중량%로 낮은데, 그 결과 유동장이 710㎜로, 본 발명의 실시예들에 비해 주조성이 떨어진다.On the other hand, Comparative Example 12 has a low zinc content of 0.3% by weight compared to the embodiments of the present invention, as a result of the flow field is 710mm, compared to the embodiments of the present invention is inferior castability.
또한, 비교예 13은 본 발명의 실시예들에 비해 철 함량이 2.0중량%로 높은데, 그 결과 유동장이 670㎜로 낮아, 본 발명의 실시예들에 비해 주조성이 현저하게 떨어진다.In addition, Comparative Example 13 has a high iron content of 2.0% by weight compared to the embodiments of the present invention, as a result, the flow field is low as 670 mm, significantly lower castability than the embodiments of the present invention.
또한, 비교예 14는 본 발명의 실시예들에 비해 마그네슘 함량이 0.1중량%로 낮은데, 그 결과 유동장이 680㎜로 낮아, 본 발명의 실시예들에 비해 주조성이 현저하게 떨어진다.In addition, Comparative Example 14 has a magnesium content as low as 0.1% by weight compared to the embodiments of the present invention, as a result, the flow field is as low as 680mm, significantly lower castability than the embodiments of the present invention.
또한, 비교예 16은 본 발명의 실시예들에 비해, 아연 함량이 5.92중량%로 높고 마그네슘 함량이 2.08중량%로 높은데, 그 결과 열전도도가 129W/mK로 낮으며 또한 액상온도(TL)와 고상온도(TS)의 차이인 △T(TL-TS)도 63℃로 높고 용융열(H)이 249J/g으로 낮아, 본 발명의 실시예들에 비해 주조성이 떨어진다.In addition, Comparative Example 16 has a high zinc content of 5.92% by weight and a high magnesium content of 2.08% by weight compared to the embodiments of the present invention. As a result, the thermal conductivity is low as 129W / mK and the liquidus temperature (T L ) ΔT (T L -T S ), which is the difference between the solid phase temperature and T S , is also high at 63 ° C. and the heat of melting (H) is low at 249 J / g, which is inferior to the embodiments of the present invention.
또한, 비교예 17은 본 발명의 실시예들에 비해, 아연 함량이 6.10중량%로 높은데, 그 결과 열전도도가 137W/mK에 불과하여, 양호한 열전도 특성을 요구하는 방열부품에 사용되기 어렵다.In addition, Comparative Example 17 has a high zinc content of 6.10% by weight compared to the embodiments of the present invention. As a result, the thermal conductivity is only 137 W / mK, and thus it is difficult to be used in a heat dissipation component requiring good thermal conductivity.
또한, 비교예 18은 본 발명의 실시예들에 비해 철 함량이 1.63중량%로 높은데, 그 결과 용융열(H)이 212J/g으로 낮아, 본 발명의 실시예들에 비해 주조성이 떨어진다.In addition, Comparative Example 18 is a high iron content of 1.63% by weight compared to the embodiments of the present invention, as a result of the heat of fusion (H) is low as 212J / g, castability is inferior to the embodiments of the present invention.
하기 표 3은 본 발명의 실시예 1~11에 따른 각 합금과 비교예 15~18 합금으로 제조한 인장시편으로 시험한 인장시험 결과를 나타낸 것이다.Table 3 below shows the tensile test results of the test specimens prepared from the alloys of Examples 1 to 11 and Comparative Examples 15 to 18 alloys of the present invention.
표 3
합금(중량%) Zn Fe Mg Si Al 인장강도(MPa) 항복강도(MPa) 연신율(%)
실시예 1 1.00 1.04 0.54 - bal. 106 75 25
2 1.49 1.09 0.55 - bal. 122 91 20
3 1.98 1.10 0.54 - bal. 126 89 21
4 1.91 0.63 0.17 - bal. 107 78 20
5 1.98 0.97 0.41 - bal. 125 91 22
6 1.88 0.56 0.54 - bal. 123 85 23
7 1.90 0.52 0.67 - bal. 127 91 26
8 3.97 0.96 0.39 - bal. 148 107 16
9 4.05 1.02 0.83 - bal. 213 173 11
10 3.91 0.60 1.08 - bal. 214 186 12
11 3.82 0.56 1.35 - bal. 225 165 12
비교예 15 0.92 0.97 0.21 10.20 bal. 134 120 3
16 5.92 0.60 2.08 - bal. 235 179 9
17 6.10 1.04 1.25 - bal. 259 187 12
18 1.47 1.63 0.72 - bal. 123 89 17
TABLE 3
Alloy (% by weight) Zn Fe Mg Si Al Tensile Strength (MPa) Yield strength (MPa) Elongation (%)
Example One 1.00 1.04 0.54 - bal. 106 75 25
2 1.49 1.09 0.55 - bal. 122 91 20
3 1.98 1.10 0.54 - bal. 126 89 21
4 1.91 0.63 0.17 - bal. 107 78 20
5 1.98 0.97 0.41 - bal. 125 91 22
6 1.88 0.56 0.54 - bal. 123 85 23
7 1.90 0.52 0.67 - bal. 127 91 26
8 3.97 0.96 0.39 - bal. 148 107 16
9 4.05 1.02 0.83 - bal. 213 173 11
10 3.91 0.60 1.08 - bal. 214 186 12
11 3.82 0.56 1.35 - bal. 225 165 12
Comparative example 15 0.92 0.97 0.21 10.20 bal. 134 120 3
16 5.92 0.60 2.08 - bal. 235 179 9
17 6.10 1.04 1.25 - bal. 259 187 12
18 1.47 1.63 0.72 - bal. 123 89 17
상기 표 3에서 확인되는 바와 같이, 본 발명의 실시예 1 ~ 7에 따른 합금은, 기존의 Al-Si 합금(ADC 12, 비교예 15)에 비해 현저하게 우수한 열전도도를 나타내며, 인장특성에 있어서도 Al-Si 합금(ADC 12, 비교예 15)에 비해서 약간 낮은 수준의 인장강도(106 ~ 127MPa)를 나타내므로, 100MPa 이상의 인장강도와 함께 우수한 열전도도가 요구되는 부품에 적합하게 사용될 수 있다.As can be seen from Table 3, the alloys according to Examples 1 to 7 of the present invention exhibit a significantly higher thermal conductivity than conventional Al-Si alloys (ADC 12, Comparative Example 15), and also in tensile properties. It exhibits a slightly lower level of tensile strength (106 to 127 MPa) than Al-Si alloys (ADC 12, Comparative Example 15), and can be suitably used for parts requiring excellent thermal conductivity with tensile strength of 100 MPa or more.
또한, 본 발명의 실시예 8~11에 따른 합금은, 다이캐스팅용 알루미늄 합금으로 널리 사용되고 있는 기존의 Al-Si 합금(ADC 12, 비교예 15)에 비해서 높은 수준의 인장강도(148 ~ 225MPa)를 나타내므로, 일정한 수준의 강도와 함께 우수한 주조성과 열전도도를 요구하는 부품에 적합하게 사용될 수 있다.In addition, the alloy according to Examples 8 to 11 of the present invention has a higher level of tensile strength (148 to 225 MPa) than the existing Al-Si alloy (ADC 12, Comparative Example 15), which is widely used as an aluminum alloy for die casting. It can be used suitably for parts requiring good castability and thermal conductivity with a certain level of strength.
상기 표 3의 결과로부터, 본 발명의 실시예에 따른 알루미늄 합금은 다이캐스팅을 할 수 있는 정도의 주조성과 함께 일정한 수준의 인장강도와 우수한 열전도 특성이 요구되는 방열부품용 다이캐스팅용 알루미늄 재료로 적합하게 사용될 수 있음을 알 수 있다.From the results of Table 3, the aluminum alloy according to the embodiment of the present invention is suitably used as a die-casting aluminum material for heat-dissipating parts that require a certain level of tensile strength and excellent thermal conductivity properties with a castability capable of die casting. It can be seen that.

Claims (10)

  1. 아연(Zn) 1.0~4.5중량%, 철(Fe) 0.5~1.6중량% 및 마그네슘(Mg) 0.1~1.5중량%를 포함하고, 나머지는 알루미늄(Al)과 불가피한 불순물로 이루어진 다이캐스팅용 알루미늄 합금.Die-casting aluminum alloy containing 1.0 to 4.5% by weight of zinc (Zn), 0.5 to 1.6% by weight of iron (Fe) and 0.1 to 1.5% by weight of magnesium (Mg), with the remainder being aluminum (Al) and inevitable impurities.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 아연(Zn)의 함량은 1.0~2.0중량%, 철(Fe)의 함량은 0.8~1.5중량%, 마그네슘(Mg)의 함량은 0.5~1.0중량%인 다이캐스팅용 알루미늄 합금.The content of zinc (Zn) is 1.0 to 2.0% by weight, the content of iron (Fe) is 0.8 to 1.5% by weight, the content of magnesium (Mg) is 0.5 to 1.0% by weight aluminum alloy for die casting.
  3. 제 1 항에 있어서,The method of claim 1,
    상기 아연(Zn)의 함량은 3.0~4.5중량, 철(Fe)의 함량은 0.8~1.6중량, 마그네슘(Mg)의 함량은 0.5~1.0중량인 다이캐스팅용 알루미늄 합금.The content of zinc (Zn) is 3.0 to 4.5 weight, the content of iron (Fe) is 0.8 to 1.6 weight, the content of magnesium (Mg) is 0.5 to 1.0 weight aluminum alloy for die casting.
  4. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 열전도도가 160W/mK 이상인 다이캐스팅용 알루미늄 합금.Die-casting aluminum alloy having a thermal conductivity of 160W / mK or more of the aluminum alloy.
  5. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 열전도도가 180W/mK 이상인 다이캐스팅용 알루미늄 합금.Die-casting aluminum alloy, the thermal conductivity of the aluminum alloy is 180W / mK or more.
  6. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 액상온도(TL)와 고상온도(TS)의 차인 △T(TL-TS)가 45℃ 이하인 다이캐스팅용 알루미늄 합금.Die alloy aluminum alloy of which the difference between the liquidus temperature (T L ) and the solid-state temperature (T S ) of the aluminum alloy ΔT (T L -T S ) is 45 ℃ or less.
  7. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 용융열(H)이 280J/g 이상인 다이캐스팅용 알루미늄 합금.Die-casting aluminum alloy, the heat of fusion (H) of the aluminum alloy is 280J / g or more.
  8. 제 1 항 내지 제 7 항 중 어느 한 항에 있어서,The method according to any one of claims 1 to 7,
    상기 알루미늄 합금의 인장강도는 100 MPa 이상인 다이캐스팅용 알루미늄 합금.Tensile strength of the aluminum alloy is 100 MPa or more die-casting aluminum alloy.
  9. 제 1 항 내지 제 7 항 중 어느 한 항에 있어서,The method according to any one of claims 1 to 7,
    상기 알루미늄 합금의 인장강도는 150 MPa 이상인 다이캐스팅용 알루미늄 합금.Tensile strength of the aluminum alloy is 150 MPa or more die-casting aluminum alloy.
  10. 제 1 항 내지 제 7 항 중 어느 한 항에 있어서,The method according to any one of claims 1 to 7,
    상기 알루미늄 합금은, 미세조직 내에 분산된 MgZn2 화합물과 Al-Fe화합물을 포함하는 다이캐스팅용 알루미늄 합금.The aluminum alloy, die-casting aluminum alloy containing MgZn 2 compound and Al-Fe compound dispersed in a microstructure.
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