WO2013055075A2 - High heat conductivity al-si-fe-zn alloy for die casting - Google Patents

High heat conductivity al-si-fe-zn alloy for die casting Download PDF

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WO2013055075A2
WO2013055075A2 PCT/KR2012/008162 KR2012008162W WO2013055075A2 WO 2013055075 A2 WO2013055075 A2 WO 2013055075A2 KR 2012008162 W KR2012008162 W KR 2012008162W WO 2013055075 A2 WO2013055075 A2 WO 2013055075A2
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alloy
thermal conductivity
die casting
present
aluminum alloy
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PCT/KR2012/008162
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French (fr)
Korean (ko)
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WO2013055075A3 (en
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김기태
신제식
고세현
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한국생산기술연구원
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Priority to US14/350,080 priority Critical patent/US20140234159A1/en
Publication of WO2013055075A2 publication Critical patent/WO2013055075A2/en
Publication of WO2013055075A3 publication Critical patent/WO2013055075A3/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
    • C22C21/10—Alloys based on aluminium with zinc 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
    • 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
    • C22C21/02—Alloys based on aluminium with silicon 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 is also known as die casting. It is a precision casting method in which molten metal is injected into a steel mold precisely machined to exactly match the required casting shape to obtain the same casting as the mold. A product manufactured through this casting method is called a diecast casting.
  • the metal used for die casting casting is generally an alloy of zinc, aluminum, tin, copper, magnesium, and the like, and these alloys are melted and made of molten metal, and then pressurized through a pressurization device such as air pressure, hydraulic pressure, hydraulic pressure, etc. It is injected into a mold and solidified by metal cooling.
  • Die-casting castings made through this process are used in various fields, and are particularly applied to automobile parts, and are widely used in the manufacture of parts such as electric devices, optical devices, vehicles, weaving machines, architecture, and measuring instruments.
  • Al-Si-based alloys and Al-Mg-based alloys excellent in castability are mainly used as die casting aluminum alloys.
  • Al-Si alloys or Al-Mg alloys because of their excellent castability but low thermal conductivity of 90 to 140 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 problems of the prior art as described above, has a high strength compared to pure aluminum with excellent castability, and at the same time exhibits a thermal conductivity of 160W / mK or more, various structural parts requiring excellent thermal conductivity
  • An object of the present invention is to provide an aluminum alloy for die casting applicable to the present invention.
  • the present invention comprises 1.0 to 2.0% by weight of silicon (Si), 0.5 to 1.6% by weight of iron (Fe), and 0.6 to 1.6% by weight of zinc (Zn), with the remainder being aluminum (Al). ) And an unavoidable impurity.
  • the thermal conductivity is 160W / mK or more, preferably 170W / mK or more.
  • (DELTA) T which is a solid-liquid coexistence area
  • region is 70 degrees C or less.
  • the tensile strength is 110 MPa or more, preferably 120 MPa.
  • the aluminum alloy according to the present invention may include a Fe compound dispersed in the microstructure.
  • the aluminum alloy according to the present invention by controlling the components of silicon (Si), iron (Fe) and zinc (Zn), ensures the castability required to obtain a sound casting in the die casting casting method, and at the same time good mechanical strength And it has excellent thermal conductivity, can be used suitably for the manufacture of heat dissipation parts for electrical, electronic and automotive that require thermal conductivity of 160W / mK or more.
  • 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 present invention is a high-temperature conductive aluminum alloy for die casting composed of alloys of silicon (Si), iron (Fe) and zinc (Zn), 1.0 to 2.0% by weight of silicon (Si), 0.5 to 1.6% by weight of iron (Fe), zinc (Zn) 0.6-1.6 wt% and the remainder is composed of aluminum (Al) and 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.
  • a high thermal conductivity aluminum alloy for die casting can be obtained which can exhibit excellent castability and good mechanical properties and can exhibit thermal conductivity of 160 W / mK or more.
  • Silicon (Si) is an element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to a solid solution strengthening effect. Silicon is added 1.0 to 2.0% by weight to the alloy according to the present invention. If the silicon content is less than 1.0% by weight, the castability of the alloy is lowered, so that some unmolded parts are generated when molding the product by die casting, which significantly impairs the integrity of the cast product, and the content of silicon is 2.0% by weight. If it exceeds, thermal conductivity will fall and thermal conductivity more than 160W / mK made into the objective by this invention cannot be obtained.
  • iron (Fe) has a very high solubility in aluminum at room temperature of 0.052% by weight, most of it is crystallized as an intermetallic compound such as Al 3 Fe after casting, so it is added to aluminum to increase strength while minimizing a decrease in thermal conductivity of aluminum. It can be made, and at the same time the alloy element to reduce the mold adhesion when forming the aluminum alloy product by die casting.
  • Iron is added to the die casting alloy according to the present invention 0.5 to 1.6% by weight. If the iron content is less than 0.5% by weight, the effect of preventing mold quenching is low, and when the product is formed by die casting, sintering of the product occurs in some mold parts and the strength is not sufficient, and the iron content is 1.6. It is because when it exceeds weight%, the Fe-rich phase (Fe-rich phase) will be excessively crystallized in an alloy, and the castability of an alloy will fall.
  • Preferred iron (Fe) content is 0.8 to 1.2% by weight.
  • Zinc (Zn) is an alloying element that can be added as an alloying element to aluminum according to the present invention to not only improve castability, but also increase tensile strength through a solid solution strengthening effect.
  • zinc is added in an amount of 0.6 to 1.6% by weight.
  • the castability of the alloy is lowered, so that some unmolded parts are generated when the product is formed by die casting.
  • the thermal conductivity of the alloy is lowered, it is because a good thermal conductivity of 160W / mK or more of the object of the present invention can not be obtained.
  • Preferred zinc (Zn) content is 0.8 to 1.2% by weight.
  • a high thermal conductivity Al-Si-Fe-Zn alloy for die casting according to an embodiment of the present invention will be described in detail with reference to Tables 1 and 2 below.
  • the present inventors prepared the test piece by the melt stirring type aluminum alloy manufacturing method which is normally used at the time of die-casting an alloy having the composition shown in Table 1 to manufacture a high thermal conductivity Al-Si-Fe-Zn alloy for die casting.
  • thermal conductivity which is one of the main purposes of the alloy according to an embodiment of the present invention
  • the alloy molten metal is injected into a fluid test mold as shown in FIG. 1 having a width of 12 mm, a thickness of 5 mm, and a maximum length of 780 mm at a temperature of 200 ° C., and the alloy molten metal has a constant distance.
  • 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.
  • Table 2 shows the results of evaluating the flow field, the thermal conductivity, the liquidus temperature and the solidus temperature, and the difference of each alloy.
  • the aluminum alloys according to Examples 1 to 5 of the present invention all of the thermal conductivity is 160W / mK or more (170 W / mK or more), excellent thermal conductivity of the level required for heat dissipation parts Indicated.
  • the thermal conductivity of Example 1 having a low silicon (Si) content and Examples 2, 4 and 5 alloys having a relatively high iron (Fe) content in the range that does not impair castability is very high at 170W / mK or more. It can be seen that high.
  • the flow field shown in Table 2 and ⁇ T which is a difference between the liquidus temperature and the solidus temperature, are the main indexes for evaluating the castability of the alloy, and the larger the flowfield, the better the fluidity of the alloy is. It is evaluated that the smaller ⁇ T is, the better the castability.
  • the aluminum alloys according to the embodiment of the present invention has a flow length of 780 mm, which is equivalent to that of Al-Si alloys (ADC 12, Comparative Example 1), which are widely used as die casting aluminum alloys. It can be seen that the level.
  • the aluminum alloy according to Examples 1 to 5 of the present invention is less than 70 ° C, which is lower than 74 ° C of Comparative Example 4, which is widely used as an aluminum alloy for die casting.
  • the alloys according to Examples 1 to 5 of the present invention are equivalent to or better than those of Comparative Example 1, which are widely used as die casting aluminum alloys in both flow fields and ⁇ T, which are two indicators of castability, and thus are required for die casting. It can be said that it is provided with castability.
  • Comparative Example 2 is an Al-Si-Fe-Zn alloy to which 0.56% by weight of silicon (Si) content is added compared to the embodiment of the present invention, the flow field is 720mm due to lack of silicon (Si) content Compared to the aluminum alloy according to the embodiment of the castability is poor.
  • Comparative Example 3 is an Al-Si-Fe-Zn alloy added 4.5 wt% of silicon (Si) content significantly higher than the embodiment of the present invention, the result is a thermal conductivity of 142W / mK in heat dissipation products Difficult to meet the required level
  • Comparative Example 4 is an Al-Si-Fe-Zn alloy added with 1.83% by weight of iron (Fe) higher than the embodiment of the present invention, the iron (Fe) content is high, the flow field is 560mm, the present invention Compared to the aluminum alloy according to the embodiment of the castability is significantly lower.
  • Comparative Example 5 is an Al-Si-Fe-Zn alloy added 0.46% by weight of zinc (Zn) lower than the embodiment of the present invention, the flow field is 750mm compared to the alloy according to the embodiment of the present invention Poor castability
  • Comparative Example 6 is an Al-Si-Fe-Zn alloy added with 1.45% by weight of zinc (Zn) higher than the embodiment of the present invention, the castability is equivalent to the embodiment of the present invention, but the thermal conductivity It is 155W / mK, which is lower than the thermal conductivity required by heat dissipation products.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

The present invention relates to an aluminum alloy for die casting, which has a superior casting property, a fair mechanical characteristic, while also providing superior heat conductivity, and which thus can be applicable to various casting products that require protection against heat. The aluminum alloy, according to the present invention, comprises: 1.0 to 2.0 wt.% of silicon (Si); 0.8 to 1.6 wt.% of iron (Fe); 0.6 to 1.3 wt.% of zinc (Zn); and a remainder of aluminum (Al) and inevitable impurities.

Description

다이캐스팅용 고열전도도 Ａｌ-Ｓｉ-Ｆｅ-Ｚｎ 합금High Thermal Conductivity for Die Castings Ａｌ-Ｓｉ-Ｆｅ-ｎ Alloy
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 한다. 필요한 주조형상에 완전히 일치하도록 정확하게 기계가공된 강제의 금형에 용융금속을 주입하여 금형과 똑같은 주물을 얻는 정밀주조법이며, 이 주조법을 통해 제조한 제품을 다이캐스트 주물이라고 한다.Die casting is also known as die casting. It is a precision casting method in which molten metal is injected into a steel mold precisely machined to exactly match the required casting shape to obtain the same casting as the mold. A product manufactured through this casting method is called a diecast casting.
다이캐스팅 주물은 치수가 정확하므로 다듬질할 필요가 거의 없는 장점 외에 기계적 성질이 우수하며, 대량생산이 가능하다는 특징이 있다. 한편, 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 금속 냉각 응고된다. Die-casting castings are precisely dimensioned so that they do not need to be trimmed, but also have excellent mechanical properties and mass production. On the other hand, the metal used for die casting casting is generally an alloy of zinc, aluminum, tin, copper, magnesium, and the like, and these alloys are melted and made of molten metal, and then pressurized through a pressurization device such as air pressure, hydraulic pressure, hydraulic pressure, etc. It is injected into a mold and solidified by metal cooling.
이러한 과정을 통해 만들어진 다이캐스팅 주조품은 여러 분야에 사용되고 있으며, 특히 자동차부품에 많이 적용되고 있고, 전기기기, 광학기기, 차량, 방직기, 건축, 계측기 등의 부품 제작 등에도 널리 사용되고 있다.Die-casting castings made through this process are used in various fields, and are particularly applied to automobile parts, and are widely used in the manufacture of parts such as electric devices, optical devices, vehicles, weaving machines, architecture, and measuring instruments.
한편, 다이캐스팅용 알루미늄 합금으로는 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 90~140W/mK로 낮기 때문에, 160W/mK 이상의 높은 열전도도를 필요로 하는 전기, 전자 및 자동차용 방열부품에는 사용이 제한되어 왔다.On the other hand, Al-Si-based alloys and Al-Mg-based alloys excellent in castability are mainly used as die casting aluminum alloys. However, in the case of Al-Si alloys or Al-Mg alloys, because of their excellent castability but low thermal conductivity of 90 to 140 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 등에 일부 사용되고 있는데, 순 알루미늄은 열전도도는 매우 우수하지만 인장강도가 낮고 주조성이 좋지 않기 때문에, 열전도도와 함께 우수한 기계적 특성을 요구하는 구조용 부품에까지 적용하기에는 한계가 있다. For heat dissipation parts that require such high thermal conductivity, products that have been die-cast pure aluminum with very high thermal conductivity of 220 W / mK or more are used in electric and electronic rotors, and pure aluminum has excellent thermal conductivity. However, since the tensile strength is low and the castability is not good, there is a limit to apply to structural parts requiring excellent mechanical properties together with thermal conductivity.
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 90~140W/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 a thermal conductivity of 90 to 140W / mK are used as the die casting aluminum alloys. It is true.
본 발명은 상기와 같은 종래기술의 문제점을 해결하기 위하여 안출한 것으로서, 우수한 주조성과 함께 순 알루미늄에 비해 높은 강도를 가지며, 동시에 160W/mK 이상의 열전도도를 나타내, 우수한 열전도도를 요하는 다양한 구조 부품에 적용할 수 있는 다이캐스팅용 알루미늄 합금을 제공하는 것을 과제로 한다.The present invention has been made in order to solve the problems of the prior art as described above, has a high strength compared to pure aluminum with excellent castability, and at the same time exhibits a thermal conductivity of 160W / mK or more, various structural parts requiring excellent thermal conductivity An object of the present invention is to provide an aluminum alloy for die casting applicable to the present invention.
상기의 과제의 해결수단으로 본 발명은, 실리콘(Si) 1.0~2.0중량%, 철(Fe) 0.5~1.6중량%, 및 아연(Zn) 0.6~1.6중량%를 포함하고, 나머지는 알루미늄(Al)과 불가피한 불순물로 이루어진 다이캐스팅용 알루미늄 합금을 제공한다.In order to solve the above problems, the present invention comprises 1.0 to 2.0% by weight of silicon (Si), 0.5 to 1.6% by weight of iron (Fe), and 0.6 to 1.6% by weight of zinc (Zn), with the remainder being aluminum (Al). ) And an unavoidable impurity.
또한, 본 발명에 따른 알루미늄 합금에 있어서, 열전도도는 160W/mK 이상이며, 바람직하게는 170W/mK 이상일 수 있다. In addition, in the aluminum alloy according to the present invention, the thermal conductivity is 160W / mK or more, preferably 170W / mK or more.
또한, 본 발명에 따른 알루미늄 합금에 있어서, 고액공존영역인 △T는 70℃ 이하이다.Moreover, in the aluminum alloy which concerns on this invention, (DELTA) T which is a solid-liquid coexistence area | region is 70 degrees C or less.
또한, 본 발명에 따른 알루미늄 합금에 있어서, 인장강도는 110 MPa 이상이고, 바람직하게는 120MPa일 수 있다. In addition, in the aluminum alloy according to the present invention, the tensile strength is 110 MPa or more, preferably 120 MPa.
또한, 본 발명에 따른 알루미늄 합금에 있어서, 미세조직내에 분산된 Fe화합물을 포함할 수 있다. In addition, in the aluminum alloy according to the present invention, it may include a Fe compound dispersed in the microstructure.
본 발명에 따른 알루미늄 합금은, 실리콘(Si), 철(Fe) 및 아연(Zn)의 성분의 제어를 통해, 다이캐스팅 주조법에서 건전한 주물을 얻을 수 있는데 요구되는 주조성을 확보함과 동시에, 양호한 기계적 강도 및 우수한 열전도도를 가져, 160W/mK 이상의 열전도도를 요구하는 전기, 전자 및 자동차용 방열부품의 제조에 적합하게 사용될 수 있다.The aluminum alloy according to the present invention, by controlling the components of silicon (Si), iron (Fe) and zinc (Zn), ensures the castability required to obtain a sound casting in the die casting casting method, and at the same time good mechanical strength And it has excellent thermal conductivity, can be used suitably for the manufacture of heat dissipation parts for electrical, electronic and automotive that require thermal conductivity of 160W / mK or more.
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 발명은 실리콘(Si), 철(Fe) 및 아연(Zn)이 합금되어 구성된 다이캐스팅용 고열전도도 알루미늄 합금으로서, 실리콘(Si) 1.0~2.0중량%, 철(Fe) 0.5~1.6중량%, 아연(Zn) 0.6~1.6중량% 및 나머지는 알루미늄(Al)과 불순물로 구성된다.The present invention is a high-temperature conductive aluminum alloy for die casting composed of alloys of silicon (Si), iron (Fe) and zinc (Zn), 1.0 to 2.0% by weight of silicon (Si), 0.5 to 1.6% by weight of iron (Fe), zinc (Zn) 0.6-1.6 wt% and the remainder is composed of aluminum (Al) and 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 양호한 기계적 특성을 나타내면서 동시에 160W/mK 이상의 열전도도를 나타낼 수 있는 다이캐스팅용 고열전도도 알루미늄 합금을 얻는다.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 a combination of alloying elements capable of minimizing deterioration, a high thermal conductivity aluminum alloy for die casting can be obtained which can exhibit excellent castability and good mechanical properties and can exhibit thermal conductivity of 160 W / 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.
실리콘(Si)은 알루미늄에 합금원소로 첨가되어 주조성을 향상시키고 고용강화 효과에 따라서 인장강도를 증가시킬 수 있는 원소이다. 본 발명에 따른 합금에는 실리콘이 1.0~2.0중량% 첨가된다. 이는 상기 실리콘의 함량이 1.0중량% 미만이면 합금의 주조성이 저하되어 다이캐스팅에 의하여 제품을 성형할 때에 일부 미성형부가 발생되어 주조품의 건전성이 크게 훼손될 수 있고, 상기 실리콘의 함량이 2.0중량% 초과하면 열전도도가 저하되어, 본 발명에서 목적으로 하는 160W/mK 이상의 열전도도를 얻을 수 없기 때문이다.Silicon (Si) is an element that can be added as an alloying element to aluminum to improve castability and increase tensile strength according to a solid solution strengthening effect. Silicon is added 1.0 to 2.0% by weight to the alloy according to the present invention. If the silicon content is less than 1.0% by weight, the castability of the alloy is lowered, so that some unmolded parts are generated when molding the product by die casting, which significantly impairs the integrity of the cast product, and the content of silicon is 2.0% by weight. If it exceeds, thermal conductivity will fall and thermal conductivity more than 160W / mK made into the objective by this invention cannot be obtained.
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% 첨가된다. 이는, 상기 철의 함량이 0.5중량% 미만이면 금형소착 방지 효과가 낮아져 다이캐스팅에 의하여 제품을 성형할 때에 일부 금형부위에 제품의 소착현상이 발생하고 강도도 충분하지 못하게 되고, 상기 철의 함량이 1.6중량% 초과하면 합금내에서 Fe-부화상(Fe-rich상)이 과도하게 정출되어, 합금의 주조성을 저하시키기 때문이다. 바람직한 철(Fe) 함량은 0.8~1.2중량%이다.Since iron (Fe) has a very high solubility in aluminum at room temperature of 0.052% by weight, most of it is crystallized as an intermetallic compound such as Al 3 Fe after casting, so it is added to aluminum to increase strength while minimizing a decrease in thermal conductivity of aluminum. It can be made, and at the same time the alloy element to reduce the mold adhesion when forming the aluminum alloy product by die casting. Iron is added to the die casting alloy according to the present invention 0.5 to 1.6% by weight. If the iron content is less than 0.5% by weight, the effect of preventing mold quenching is low, and when the product is formed by die casting, sintering of the product occurs in some mold parts and the strength is not sufficient, and the iron content is 1.6. It is because when it exceeds weight%, the Fe-rich phase (Fe-rich phase) will be excessively crystallized in an alloy, and the castability of an alloy will fall. Preferred iron (Fe) content is 0.8 to 1.2% by weight.
아연(Zn)은 본 발명에 의한 알루미늄에 합금원소로 첨가되어 주조성을 향상시킬 뿐 아니라, 고용강화 효과를 통해 인장강도도 증가시킬 수 있는 합금원소이다. 본 발명에 의한 합금에는 아연이 0.6~1.6중량% 첨가되는데, 이는 상기 아연의 함량이 0.6중량% 미만이면 합금의 주조성이 저하되어 다이캐스팅에 의하여 제품을 성형할 때에 일부 미성형부가 발생되고, 아연의 함량이 1.6중량% 초과하면 합금의 열전도도가 저하되어 본 발명에서 목적으로 하는 160W/mK 이상의 양호한 열전도도를 얻을 수 없기 때문이다. 바람직한 아연(Zn)의 함량은 0.8~1.2중량%이다.Zinc (Zn) is an alloying element that can be added as an alloying element to aluminum according to the present invention to not only improve castability, but also increase tensile strength through a solid solution strengthening effect. In the alloy according to the present invention, zinc is added in an amount of 0.6 to 1.6% by weight. When the zinc content is less than 0.6% by weight, the castability of the alloy is lowered, so that some unmolded parts are generated when the product is formed by die casting. If the content of more than 1.6% by weight, the thermal conductivity of the alloy is lowered, it is because a good thermal conductivity of 160W / mK or more of the object of the present invention can not be obtained. Preferred zinc (Zn) content is 0.8 to 1.2% by weight.
[실시예]EXAMPLE
본 발명의 실시예에 따른 다이캐스팅용 고열전도도 Al-Si-Fe-Zn 합금에 대하여 하기 표 1 및 2를 참조하여, 상세하게 설명한다.A high thermal conductivity Al-Si-Fe-Zn alloy for die casting according to an embodiment of the present invention will be described in detail with reference to Tables 1 and 2 below.
본 발명자들은 다이캐스팅용 고열전도도 Al-Si-Fe-Zn 합금을 제조하기 위해 하기 표 1에 나타낸 조성을 갖는 합금을, 다이캐스팅 제조시에 통상적으로 사용되는 용융 교반식 알루미늄 합금 제조 방법으로 시험편을 제조하였다.The present inventors prepared the test piece by the melt stirring type aluminum alloy manufacturing method which is normally used at the time of die-casting an alloy having the composition shown in Table 1 to manufacture a high thermal conductivity Al-Si-Fe-Zn alloy for die casting.
표 1
합금(중량%) Si Fe Zn Al
실시예 1 1.03 0.89 1.00 bal.
2 1.21 1.08 0.97 bal.
3 1.67 0.84 1.00 bal.
4 1.21 0.59 1.42 bal.
5 1.51 0.57 1.44 bal.
비교예 1 10.20 1.17 0.92 bal.
2 0.56 0.79 1.02 bal.
3 4.5 0.8 0.60 bal.
4 1.12 1.83 0.75 bal.
5 1.33 1.14 0.46 bal.
6 1.58 0.97 1.45 bal.
Table 1
Alloy (% by weight) Si Fe Zn Al
Example One 1.03 0.89 1.00 bal.
2 1.21 1.08 0.97 bal.
3 1.67 0.84 1.00 bal.
4 1.21 0.59 1.42 bal.
5 1.51 0.57 1.44 bal.
Comparative example One 10.20 1.17 0.92 bal.
2 0.56 0.79 1.02 bal.
3 4.5 0.8 0.60 bal.
4 1.12 1.83 0.75 bal.
5 1.33 1.14 0.46 bal.
6 1.58 0.97 1.45 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 고상온도 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 도전율 측정기를 이용하여 제조한 시편의 상온에서 도전율을 측정한 후, 하기 [식 1]의 환산식으로 환산하는 방식을 통해 열전도도를 얻었다.For the thermal conductivity, which is one of the main purposes of the alloy according to an embodiment of the present invention, first by measuring the conductivity at room temperature of the specimen prepared by using a conductivity meter through a method of converting the conversion formula of the following [Equation 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 is injected into a fluid test mold as shown in FIG. 1 having a width of 12 mm, a thickness of 5 mm, and a maximum length of 780 mm at a temperature of 200 ° C., and the alloy molten metal has a constant distance. 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, 액상 온도와 고상 온도 및 그 차이를 평가한 결과를 나타낸 것이다.Table 2 shows the results of evaluating the flow field, the thermal conductivity, the liquidus temperature and the solidus temperature, and the difference of each alloy.
표 2
합금 유동장(mm) 열전도도(W/mK) 액상온도(℃) 고상온도(℃) △T(℃)
실시예 1 780 175 654 620 34
2 780 171 652 616 36
3 780 163 650 606 44
4 780 182 652 602 50
5 780 179 650 588 62
비교예 1 780 95 575 501 74
2 720 186 656 620 36
3 - 142 630 575 55
4 560 165 - - -
5 750 168 - - -
6 780 155 - - -
TABLE 2
alloy Flow field (mm) Thermal Conductivity (W / mK) Liquid Temperature (℃) Solid State Temperature (℃) ΔT (℃)
Example One 780 175 654 620 34
2 780 171 652 616 36
3 780 163 650 606 44
4 780 182 652 602 50
5 780 179 650 588 62
Comparative example One 780 95 575 501 74
2 720 186 656 620 36
3 - 142 630 575 55
4 560 165 - - -
5 750 168 - - -
6 780 155 - - -
상기 표 2에서 확인되는 바와 같이, 본 발명의 실시예 1 내지 5에 따른 알루미늄 합금들은 모두 열전도도가 160W/mK 이상(나아가서는 170W/mK 이상)으로, 방열부품에 요구되는 수준의 우수한 열전도도를 나타내었다. 이 중에서 주조성을 해하지 않는 범위에서 실리콘(Si) 함량이 낮은 실시예 1과, 철(Fe) 함량이 상대적으로 많은 실시예 2, 실시예 4 및 5 합금의 열전도도가 모두 170W/mK 이상으로 매우 높음을 알 수 있다.As can be seen in Table 2, the aluminum alloys according to Examples 1 to 5 of the present invention, all of the thermal conductivity is 160W / mK or more (170 W / mK or more), excellent thermal conductivity of the level required for heat dissipation parts Indicated. Among them, the thermal conductivity of Example 1 having a low silicon (Si) content and Examples 2, 4 and 5 alloys having a relatively high iron (Fe) content in the range that does not impair castability is very high at 170W / mK or more. It can be seen that high.
또한, 상기 표 2에서 나타낸 유동장과, 액상온도와 고상온도의 차이인 △T는 합금의 주조성을 평가할 수 있는 주요한 지표인데, 유동장은 클수록 합금의 유동성이 우수한 것을 나타내며 액상온도와 고상온도의 차이인 △T는 작을수록 주조성이 우수하다고 평가된다. In addition, the flow field shown in Table 2 and ΔT, which is a difference between the liquidus temperature and the solidus temperature, are the main indexes for evaluating the castability of the alloy, and the larger the flowfield, the better the fluidity of the alloy is. It is evaluated that the smaller ΔT is, the better the castability.
상기 표 2에서 확인되는 바와 같이, 본 발명의 실시예에 따른 알루미늄 합금들은 유동장의 길이가 780mm로, 다이캐스팅용 알루미늄 합금으로 널리 사용되고 있는 Al-Si 합금(ADC 12, 비교예 1)과 비교하여 동등한 수준임을 알 수 있다.As confirmed in Table 2, the aluminum alloys according to the embodiment of the present invention has a flow length of 780 mm, which is equivalent to that of Al-Si alloys (ADC 12, Comparative Example 1), which are widely used as die casting aluminum alloys. It can be seen that the level.
한편, △T의 경우, 본 발명의 실시예 1 내지 5에 따른 알루미늄 합금은 70℃ 미만인데, 다이캐스팅용 알루미늄 합금으로 널리 사용되고 있는 비교예 4의 74℃에 비해서도 낮다.On the other hand, in the case of ΔT, the aluminum alloy according to Examples 1 to 5 of the present invention is less than 70 ° C, which is lower than 74 ° C of Comparative Example 4, which is widely used as an aluminum alloy for die casting.
즉, 본 발명의 실시예 1 내지 5에 따른 합금은, 주조성을 나타내는 2가지 지표인 유동장과 △T에서 모두 다이캐스팅용 알루미늄 합금으로 널리 사용되는 비교예 1과 동등하거나 나은 수준이므로, 다이캐스팅에 요구되는 주조성을 구비하고 있다고 할 수 있다.That is, the alloys according to Examples 1 to 5 of the present invention are equivalent to or better than those of Comparative Example 1, which are widely used as die casting aluminum alloys in both flow fields and ΔT, which are two indicators of castability, and thus are required for die casting. It can be said that it is provided with castability.
한편, 비교예 2는 본 발명의 실시예에 비해 실리콘(Si) 함량이 낮은 0.56중량%를 첨가한 Al-Si-Fe-Zn 합금인데, 실리콘(Si) 함량이 부족하여 유동장이 720mm로 본 발명의 실시예에 따른 알루미늄 합금에 비해 주조성이 떨어진다. On the other hand, Comparative Example 2 is an Al-Si-Fe-Zn alloy to which 0.56% by weight of silicon (Si) content is added compared to the embodiment of the present invention, the flow field is 720mm due to lack of silicon (Si) content Compared to the aluminum alloy according to the embodiment of the castability is poor.
또한, 비교예 3은 본 발명의 실시예에 비해 실리콘(Si) 함량이 상당히 높은 4.5중량%를 첨가한 Al-Si-Fe-Zn 합금인데, 그 결과가 열전도도가 142W/mK로 방열제품에서 요구되는 수준을 맞추기 어렵다. In addition, Comparative Example 3 is an Al-Si-Fe-Zn alloy added 4.5 wt% of silicon (Si) content significantly higher than the embodiment of the present invention, the result is a thermal conductivity of 142W / mK in heat dissipation products Difficult to meet the required level
또한, 비교예 4는 본 발명의 실시예에 비해 철(Fe) 함량이 높은 1.83중량%를 첨가한 Al-Si-Fe-Zn 합금인데, 철(Fe) 함량이 높아 유동장이 560mm로, 본 발명의 실시예에 따른 알루미늄 합금에 비해 주조성이 현저하게 떨어진다.In addition, Comparative Example 4 is an Al-Si-Fe-Zn alloy added with 1.83% by weight of iron (Fe) higher than the embodiment of the present invention, the iron (Fe) content is high, the flow field is 560mm, the present invention Compared to the aluminum alloy according to the embodiment of the castability is significantly lower.
또한, 비교예 5는 본 발명의 실시예에 비해 아연(Zn) 함량이 낮은 0.46중량%를 첨가한 Al-Si-Fe-Zn 합금인데, 유동장은 750mm로 본 발명의 실시예에 따른 합금에 비해 주조성이 떨어진다.In addition, Comparative Example 5 is an Al-Si-Fe-Zn alloy added 0.46% by weight of zinc (Zn) lower than the embodiment of the present invention, the flow field is 750mm compared to the alloy according to the embodiment of the present invention Poor castability
또한, 비교예 6은 본 발명의 실시예에 비해 아연(Zn) 함량이 높은 1.45중량%를 첨가한 Al-Si-Fe-Zn 합금인데, 주조성은 본 발명의 실시예와 동등한 수준이나, 열전도도가 155W/mK로 방열제품에서 요구하는 열전도도보다 낮다.In addition, Comparative Example 6 is an Al-Si-Fe-Zn alloy added with 1.45% by weight of zinc (Zn) higher than the embodiment of the present invention, the castability is equivalent to the embodiment of the present invention, but the thermal conductivity It is 155W / mK, which is lower than the thermal conductivity required by heat dissipation products.

Claims (6)

  1. 실리콘(Si) 1.0~2.0중량%, 철(Fe) 0.5~1.6중량%, 및 아연(Zn) 0.6~1.6중량%를 포함하고, 나머지는 알루미늄(Al)과 불가피한 불순물로 이루어진 다이캐스팅용 알루미늄 합금.Die-casting aluminum alloy containing 1.0 to 2.0% by weight of silicon (Si), 0.5 to 1.6% by weight of iron (Fe), and 0.6 to 1.6% by weight of zinc (Zn), with the remainder being aluminum (Al) and inevitable impurities.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 철(Fe)의 함량은 0.8~1.2중량%인 것을 특징으로 하는 다이캐스팅용 알루미늄 합금.The iron (Fe) content is die casting aluminum alloy, characterized in that 0.8 to 1.2% by weight.
  3. 제 1 항에 있어서,The method of claim 1,
    상기 아연(Zn)의 함량은 0.8~1.2중량%인 것을 특징으로 하는 다이캐스팅용 알루미늄 합금.The zinc (Zn) content is die casting aluminum alloy, characterized in that 0.8 to 1.2% by weight.
  4. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 열전도도는 160W/mK 이상인 것을 특징으로 하는 다이캐스팅용 알루미늄 합금.The thermal conductivity of the aluminum alloy is die casting aluminum alloy, characterized in that more than 160W / mK.
  5. 제 1 항에 있어서,The method of claim 1,
    상기 알루미늄 합금의 열전도도는 170W/mK 이상인 것을 특징으로 하는 다이캐스팅용 알루미늄 합금.The thermal conductivity of the aluminum alloy is die casting aluminum alloy, characterized in that more than 170W / mK.
  6. 제 1 항에 있어서, The method of claim 1,
    상기 알루미늄 합금의 고액공존영역인 △T는 70℃ 이하인 다이캐스팅용 알루미늄 합금.ΔT, which is a solid-liquid coexistence region of the aluminum alloy, is an aluminum alloy for die casting, which is 70 ° C. or less.
PCT/KR2012/008162 2011-10-10 2012-10-09 High heat conductivity al-si-fe-zn alloy for die casting WO2013055075A2 (en)

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