JP2006063420A - Aluminum alloy material for heat sink and its production method - Google Patents
Aluminum alloy material for heat sink and its production method Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 57
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 4
- 238000004512 die casting Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000032683 aging Effects 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims description 8
- 239000002023 wood Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000017525 heat dissipation Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910019089 Mg-Fe Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
Description
本発明は、強度、熱伝導性、およびダイカスト時の鋳造性に優れたアルミニウム合金材に関するものである。詳しくは、半導体等電子デバイスの放熱部品であるヒートシンクの材料として利用するのに有用なアルミニウム合金材に関するものである。 The present invention relates to an aluminum alloy material excellent in strength, thermal conductivity, and castability during die casting. More specifically, the present invention relates to an aluminum alloy material that is useful as a material for a heat sink that is a heat dissipation component of an electronic device such as a semiconductor.
アルミニウム合金は、軽量であると同時に電気伝導性および熱伝導性に優れているので、その特性に基づき種々の分野で使用されている。近年、電子機器の高性能化が進み、半導体等電子デバイスの放熱部品であるヒートシンクには高い放熱効果が求められている。また、例えばボルト締め等により組み立てられるヒートシンク部品の場合には、放熱効果と同時に、組み立ての際に変形を生じない高い材料強度も要求されている。
ヒートシンクは主にダイカストによって鋳造され、合金種としてはダイカスト用ＪＩＳ合金のＡＤＣ１２が一般に使用されている。これら合金はボルト締め等に耐え得る強度は充分有しているが、熱伝導性は悪く、高い放熱効果が求められるヒートシンク用の材料としては不十分である。
Aluminum alloys are lightweight and have excellent electrical and thermal conductivity, and are used in various fields based on their properties. 2. Description of the Related Art In recent years, electronic devices have been improved in performance, and heat sinks that are heat dissipation components of electronic devices such as semiconductors are required to have a high heat dissipation effect. For example, in the case of a heat sink component assembled by bolting or the like, a high material strength that does not cause deformation during assembly is required at the same time as the heat dissipation effect.
The heat sink is mainly cast by die casting, and a JIS alloy ADC12 for die casting is generally used as an alloy type. These alloys have sufficient strength to withstand bolting and the like, but have poor thermal conductivity and are insufficient as a material for a heat sink that requires a high heat dissipation effect.
本発明者らは、先にこれらのダイカスト用ＪＩＳ合金に対し熱伝導性に優れ、しかも切削加工に耐え得る強度を有するヒートシンク用アルミニウム合金材を提案した（特開2002-226932号）。しかしながら、この合金は熱伝導性および強度においてはヒートシンク用合金材として充分な物性を有するが、鋳造品の形状等によっては場合によって鋳造性において必ずしも満足し得ないことがある。 The present inventors have previously proposed an aluminum alloy material for a heat sink that has excellent thermal conductivity with respect to these JIS alloys for die casting and has strength that can withstand cutting (Japanese Patent Laid-Open No. 2002-226932). However, although this alloy has sufficient physical properties as a heat sink alloy material in terms of thermal conductivity and strength, it may not always be satisfactory in castability depending on the shape of the cast product.
しかして、ダイカスト用ＪＩＳ合金等の場合、熱伝導性を確保するため添加金属、例えばＳｉを減じると材料強度が低下し、例えばボルト締めを施した部分で変形が発生する等の問題が生じる。加えて、Ｓｉ量の低下がダイカスト時に溶湯の流動性を低下させるため、薄いフィン形状を有するヒートシンクでは金型内に完全に溶湯が充填されず、フィン部が欠損した不良品を生ずることとなる。
そこで、熱伝導性および強度に優れ、更にダイカスト時の鋳造性も兼ね備えたヒートシンク用のアルミニウム合金材料に対する要望が増している。
Therefore, there is an increasing demand for an aluminum alloy material for a heat sink that has excellent thermal conductivity and strength, and also has castability during die casting.
本発明の目的は、良好な放熱性が求められるヒートシンク用合金材として、良好な熱伝導性を維持しつつ、且つ高い材料強度および良好な鋳造性を有するアルミニウム合金材を提供することにある。
ここで、良好な熱伝導性とは熱伝導率で１５０ｗ／ｍ・℃以上を意味する。これは導電率では３８ＩＡＣＳ％以上に相当する。
An object of the present invention is to provide an aluminum alloy material having high material strength and good castability while maintaining good thermal conductivity as an alloy material for a heat sink that requires good heat dissipation.
Here, good thermal conductivity means 150 w / m · ° C. or more in terms of thermal conductivity. This corresponds to a conductivity of 38 IACS% or more.
本発明者らは、高い放熱性および強度が求められるヒートシンク用合金材において、その合金材が熱伝導性を維持しつつ、且つボルト締め等の局部圧に耐え得る強度を確保し、しかも鋳造性にも優れることを目的として、アルミニウム合金に添加される元素、および鋳造後の時効熱処理条件について種々検討した結果、所定量のＳｉ、Ｍｇ、Ｆｅ、Ｂを添加した合金に対し所定の時効熱処理を施すことが有用であることを見出し本発明に達した。
即ち、本発明の要旨は、Ｓｉ４．５〜１３．５ｗｔ％、Ｍｇ０．２０〜０．７０ｗｔ％、Ｆｅ０．２０〜１．００ｗｔ％、Ｂ０．００２〜０．０８ｗｔ％を含有し、残部アルミニウムおよび不可避的不純物からなり、且つ導電率が３８１ＡＣＳ％以上およびブリネル硬度値が６０以上の条件を満たすことを特徴とするヒートシンク用アルミニウム合金材に存する。
In the heat sink alloy material that requires high heat dissipation and strength, the inventors of the present invention ensure the strength that the alloy material can withstand local pressure such as bolt tightening while maintaining thermal conductivity, and castability. As a result of various studies on the elements added to the aluminum alloy and the aging heat treatment conditions after casting, a predetermined aging heat treatment is applied to the alloy to which a predetermined amount of Si, Mg, Fe, B is added. It has been found that application is useful and the present invention has been reached.
That is, the gist of the present invention includes Si 4.5 to 13.5 wt%, Mg 0.20 to 0.70 wt%, Fe 0.20 to 1.00 wt%, B0.002 to 0.08 wt%, the balance aluminum and An aluminum alloy material for a heat sink, which is made of inevitable impurities and satisfies the conditions of an electrical conductivity of 381 ACS% or more and a Brinell hardness value of 60 or more.
本発明の他の要旨は、Ｓｉ４．５〜１３．５ｗｔ％、Ｍｇ０．２０〜０．７０ｗｔ％、Ｆｅ０．２０〜１．００ｗｔ％、Ｂ０．００２〜０．０８ｗｔ％を含有し、残部アルミニウムおよび不可避的不純物からなるアルミニウム合金を、ダイカストによる鋳造後、１８０〜２５０℃の温度範囲で、０．８〜５．０時間の時間範囲で時効熱処理することを特徴とする請求項１に記載のヒートシンク用合金材の製造方法およびこれらのヒートシンク用アルミニウム合金材を用いて製造されるヒートシンクに存する。 Another gist of the present invention includes Si 4.5 to 13.5 wt%, Mg 0.20 to 0.70 wt%, Fe 0.20 to 1.00 wt%, B0.002 to 0.08 wt%, the balance aluminum and The heat sink according to claim 1, wherein an aluminum alloy composed of inevitable impurities is subjected to aging heat treatment in a temperature range of 180 to 250 ° C and a time range of 0.8 to 5.0 hours after casting by die casting. And a heat sink manufactured using these aluminum alloy materials for heat sinks.
本発明のアルミニウム合金材を利用することにより、ダイカスト時の鋳造性も良く、熱伝導性が良好で、且つ高い強度を兼ね備えたヒートシンクを提供することができるので、工業的価値は極めて大きい。 By using the aluminum alloy material of the present invention, it is possible to provide a heat sink that has good castability during die casting, good thermal conductivity, and high strength. Therefore, the industrial value is extremely high.
本発明のアルミニウム合金材は、ダイカストによって製造されたヒートシンクの中で、良好な熱伝導性と、組み立てにおけるボルト締め等の局部圧に耐え得る高い材料強度とを兼ね備えたヒートシンクの製造を目的とし、しかも良好な鋳造性をも有することを目的としたものである。即ち、この合金材は、良好な熱伝導性として、導電率で３８ＩＡＣＳ％以上（熱伝導率で１５０ｗ／ｍ・℃以上に相当）、好ましくは４０〜４４ＩＡＣＳ％であること、また、ボルト締め等に耐え得る材料強度として、ブリネル硬度値で６０以上、好ましくは６５〜７５を確保するものである。
尚、熱伝導率と導電率は比例関係にあり、一般に熱伝導性の評価として、導電率がその指標として用いられるので、以下本発明においても導電率の測定値を熱伝導性の指標として用い説明する。
The aluminum alloy material of the present invention is intended to produce a heat sink having both good thermal conductivity and high material strength that can withstand local pressure such as bolting in assembly among heat sinks produced by die casting, And it aims at having favorable castability. That is, this alloy material has a good thermal conductivity and a conductivity of 38 IACS% or more (corresponding to a thermal conductivity of 150 w / m · ° C. or more), preferably 40 to 44 IACS%, bolting, etc. As a material strength that can withstand the above, a Brinell hardness value of 60 or more, preferably 65 to 75 is ensured.
In addition, since thermal conductivity and electrical conductivity are in a proportional relationship, and in general, conductivity is used as an index for evaluating thermal conductivity, the measured value of electrical conductivity is also used as an index for thermal conductivity in the present invention. explain.
本発明のアルミニウム合金材に添加されるＳｉおよびＭｇは、両者を同時に添加することによって、合金の強度を高めることのできる元素である。特にダイカストによる鋳造後の時効熱処理によって、強度を大きく向上させることができる。
また、Ｓｉはその添加量の増加につれ、溶湯の流動性を向上させる作用がある。
Ｓｉ添加量は、４．５〜１３．５ｗｔ％、好ましくは５．５〜１２．５ｗｔ％の範囲で適宜選定する。添加量が４．５ｗｔ％未満では溶湯の湯流れ性が低下し、薄いフィンの形状のヒートシンクのダイカストが困難になる。他方、１３．５ｗｔ％を超えると導電率の低下を招く。
Si and Mg added to the aluminum alloy material of the present invention are elements that can increase the strength of the alloy by adding both simultaneously. In particular, the strength can be greatly improved by aging heat treatment after casting by die casting.
Moreover, Si has the effect | action which improves the fluidity | liquidity of a molten metal with the increase in the addition amount.
The amount of Si added is appropriately selected within the range of 4.5 to 13.5 wt%, preferably 5.5 to 12.5 wt%. When the addition amount is less than 4.5 wt%, the molten metal flowability is lowered, and die casting of a heat sink having a thin fin shape becomes difficult. On the other hand, if it exceeds 13.5 wt%, the electrical conductivity is lowered.
Ｍｇ添加量は、０．２０〜０．７０ｗｔ％、好ましくは０．２５〜０．５０ｗｔ％の範囲で適宜選定する。添加量が０．２０ｗｔ％未満では強度が不足する。他方、０．７０ｗｔ％を超えて多量添加しても強度の向上効果は殆ど無く、導電率の低下に加え、過剰のＭｇによるダイカスト鋳造時の湯流れ性低下を招くことになる。 The amount of Mg added is appropriately selected in the range of 0.20 to 0.70 wt%, preferably 0.25 to 0.50 wt%. If the addition amount is less than 0.20 wt%, the strength is insufficient. On the other hand, even if it is added in a large amount exceeding 0.70 wt%, there is almost no effect of improving the strength, and in addition to the decrease in conductivity, the flowability of molten metal during die casting due to excessive Mg is reduced.
Ｆｅは従来のダイカスト用ＪＩＳ合金にも添加されているように、アルミニウム合金と金型の焼き付きを防止するために添加される。添加量が０．２０ｗｔ％未満では焼き付き防止効果は十分ではなく、また１．００ｗｔ％を超えて添加しても、その効果は１．００ｗｔ％以下の場合と変わらず、熱伝導性の低下を招くだけである。このためＦｅの添加量は０．２０〜１．００ｗｔ％、好ましくは０．３０から０．７０ｗｔ％の範囲で適宜選定される。 Fe is added to prevent seizure between the aluminum alloy and the mold, as is also added to conventional JIS alloys for die casting. When the addition amount is less than 0.20 wt%, the effect of preventing seizure is not sufficient, and even when added over 1.00 wt%, the effect is the same as in the case of 1.00 wt% or less, and the thermal conductivity is reduced. It only invites you. For this reason, the addition amount of Fe is appropriately selected in the range of 0.20 to 1.00 wt%, preferably 0.30 to 0.70 wt%.
本発明のアルミニウム合金材に添加されるＢは、その添加によりＡｌ−Ｓｉ−Ｍｇ−Ｆｅ系合金の導電率を向上させる効果がある。その添加量は０．００２〜０．０８ｗｔ％、好ましくは０．００５〜０．０３ｗｔ％である。添加量が０．００２ｗｔ％未満では熱伝導性向上効果は十分達成されず、他方０．０８ｗｔ％を超えるとＢが過剰となり、逆に熱伝導性向上の効果を減じる。 B added to the aluminum alloy material of the present invention has an effect of improving the electrical conductivity of the Al—Si—Mg—Fe alloy. The addition amount is 0.002 to 0.08 wt%, preferably 0.005 to 0.03 wt%. If the addition amount is less than 0.002 wt%, the effect of improving the thermal conductivity is not sufficiently achieved. On the other hand, if it exceeds 0.08 wt%, B becomes excessive, and conversely the effect of improving the thermal conductivity is reduced.
本発明のアルミニウム合金材は、ダイカスト鋳造後に時効熱処理を施すことで、その熱伝導性および強度を同時に向上させることができる。
時効熱処理における温度範囲は、１８０〜２５０℃、好ましくは１９０〜２３５℃の範囲で適宜選定する。１８０℃未満では、強度向上のために長時間の熱処理が必要となり、生産性が悪くなるため実用的ではない。他方２５０℃を超えると過時効となって強度低下を招く。
時効熱処理時間は、０．８〜５．０時間、好ましくは１．０〜４．０時間の範囲で適宜選定する。０．８時間未満では強度向上が十分ではない。他方、５．０時間を超えると過時効となって強度低下を招くだけでなく、生産性も悪くなる。
The aluminum alloy material of the present invention can be simultaneously improved in thermal conductivity and strength by performing an aging heat treatment after die casting.
The temperature range in the aging heat treatment is appropriately selected within the range of 180 to 250 ° C, preferably 190 to 235 ° C. Below 180 ° C., heat treatment for a long time is required to improve strength, and productivity is deteriorated, which is not practical. On the other hand, when it exceeds 250 ° C., it becomes over-aged and causes a decrease in strength.
The aging heat treatment time is appropriately selected in the range of 0.8 to 5.0 hours, preferably 1.0 to 4.0 hours. If it is less than 0.8 hour, the strength is not sufficiently improved. On the other hand, if it exceeds 5.0 hours, it will be over-aged and will not only lead to a decrease in strength, but also the productivity will deteriorate.
本発明のアルミニウム合金材は、上記合金成分元素の他、不可避的不純物を含有するが、必要に応じ他の特性の改善、例えば耐食性改善等のために添加される成分を、本発明合金が必須とする上記導電率およびブリネル硬度の特性、更には鋳造性を損なわない範囲で含んでいても良い。そのような成分元素としては、例えば、Ｃｕ、Ｚｎ、Ｎｉ、Ｃｏ、Ｍｎ，Ｚｒ、Ｃｒ、Ｔｉ、Ｓｎ，Ｉｎ、Ｃａ、Ｓｒ、Ｎａ等が挙げられるが、これらの成分は過剰の添加により熱伝導性を低下させるおそれがあるので、ＮｉおよびＣｏについては０．６０ｗｔ％以下、その他の元素については０．２０ｗｔ％以下とすることが必要である。 The aluminum alloy material of the present invention contains unavoidable impurities in addition to the above-mentioned alloy constituent elements, but the present alloy is indispensable as a component added to improve other characteristics as needed, for example, corrosion resistance. The above-mentioned conductivity and Brinell hardness characteristics, and further may be included in a range not impairing the castability. Examples of such component elements include Cu, Zn, Ni, Co, Mn, Zr, Cr, Ti, Sn, In, Ca, Sr, and Na. These components are heated by excessive addition. Since conductivity may be lowered, it is necessary that Ni and Co be 0.60 wt% or less and other elements be 0.20 wt% or less.
本発明のアルミニウム合金材は、従来のダイカスト用ＪＩＳ合金よりも高い熱伝導性を有しており、且つ高い強度および良好な鋳造性を維持しているため、良好な放熱特性、材料強度、およびダイカスト時の鋳造性を兼ね備えたヒートシンクの材料として利用することが出来る。 The aluminum alloy material of the present invention has higher thermal conductivity than a conventional JIS alloy for die casting, and maintains high strength and good castability. Therefore, good heat dissipation characteristics, material strength, and It can be used as a material for heat sinks that have castability during die casting.
以下に本発明を実施例により更に詳細に説明するが、本発明はその要旨を超えない限り以下の実施例に限定されるものではない。
実施例１および比較例１
表１に示した各組成の合金を金型に鋳造し、鋳塊の導電率およびブリネル硬度を測定した。更に表１の各合金について鋳造後および２１５℃×２時間の時効熱処理した後の導電率およびブリネル硬度を測定し物性値を評価した。測定結果を表−１に纏めて示す。合金調製用のアルミニウムとしては、純度９９．８ｗｔ％のものを用いた。
EXAMPLES The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples unless it exceeds the gist.
Example 1 and Comparative Example 1
Alloys having the respective compositions shown in Table 1 were cast into molds, and the ingot conductivity and Brinell hardness were measured. Further, the electrical properties and Brinell hardness of each alloy shown in Table 1 after casting and after aging heat treatment at 215 ° C. × 2 hours were measured to evaluate physical properties. The measurement results are summarized in Table-1. As the aluminum for preparing the alloy, one having a purity of 99.8 wt% was used.
表１の結果から明らかなように、本発明の実施例の組成範囲において、時効熱処理後、導電率３８ＩＡＣＳ％以上、ブリネル硬度値６０以上が達成されている。また、Ａｌ−Ｓｉ−Ｍｇ−Ｆｅ系合金で添加元素が本発明の組成範囲内であり、本発明に規定する導電率およびブリネル硬度値を有する比較例合金（Ｎｏ．１３）であっても、更に所定範囲のＢの添加によって同一組成の合金の導電率を無添加の場合に比べ、より高めることができることが実施例Ｎｏ．２の合金と対比することにより明らかである。
尚、比較例Ｎｏ．９の合金は、導電率およびブリネル硬度は本発明の規定を満たしているが、Ｓｉ量が少なく、ダイカスト時の鋳造性（湯流れ性）が実施例の合金より劣る。また、比較例Ｎｏ．１２の合金も、導電率およびブリネル硬度は本発明の規定を満たしているが、Ｍｇの添加によっても強度向上の効果は殆ど無く、導電率および鋳造性を低下させるだけである。
比較例Ｎｏ．１４の従来のダイカスト用合金（ＡＤＣ１２）では、本発明の実施例合金と比較して導電率が著しく低い。
As is apparent from the results in Table 1, in the composition range of the examples of the present invention, a conductivity of 38 IACS% or more and a Brinell hardness value of 60 or more are achieved after the aging heat treatment. Moreover, even if it is a comparative example alloy (No. 13) which has the electrical conductivity and Brinell hardness value which prescribe | regulate in an Al-Si-Mg-Fe type | system | group alloy and an additional element is in the composition range of this invention, and is prescribed in this invention, Furthermore, it is possible to increase the electrical conductivity of the alloy of the same composition by adding B in a predetermined range as compared with the case where no addition is made. It is clear by comparison with the alloy of 2.
Comparative Example No. The alloy No. 9 satisfies the provisions of the present invention in terms of electrical conductivity and Brinell hardness, but has a small amount of Si and is inferior to the alloy of the example in castability (water flowability) during die casting. Comparative Example No. In the alloy No. 12, the electrical conductivity and the Brinell hardness also satisfy the provisions of the present invention, but the addition of Mg has almost no effect of improving the strength and only reduces the electrical conductivity and castability.
Comparative Example No. The 14 conventional die casting alloys (ADC12) have significantly lower electrical conductivity than the example alloys of the present invention.
実施例２
表１に示した合金の湯流れ性（流動性）を流動長テスト及びフィン湯廻りテストにより評価し、その結果を表２に示した。
流動長テストは、渦巻き型の金型を用い、鋳込み温度を液相線温度＋５０℃、金型予熱温度を２５０℃として鋳込んだ溶湯の流動長を測定することにより行った。
また、フィン湯廻りテストは、厚さ１．２ｍｍ、高さ４０ｍｍのフィン形状を有するヒートシンクをダイカストにより鋳造し、湯廻り不良によるフィン部欠損の発生率で評価した。
Example 2
The molten metal flowability (fluidity) of the alloys shown in Table 1 was evaluated by a flow length test and a fin molten metal test, and the results are shown in Table 2.
The flow length test was performed by measuring the flow length of the molten metal using a spiral mold, the casting temperature being the liquidus temperature + 50 ° C., and the mold preheating temperature being 250 ° C.
Further, in the fin hot water test, a heat sink having a fin shape with a thickness of 1.2 mm and a height of 40 mm was cast by die casting, and evaluation was made based on the occurrence rate of fin portion defects due to poor hot water.
表２の結果から、Ｓｉ３．０ｗｔ％の比較例合金Ｎｏ．９では、流動長が低下し、フィン湯廻り不良も実施例合金に比較して大幅に増加することが判る。なお、Ｓｉの添加量が多いほど流動性は高まるが、実際のヒートシンク製造にあたっては、フィン部の形状によって熱伝導性と湯流れ性の双方のバランスを考慮の上、Ｓｉ量が決定される。 From the results in Table 2, the comparative alloy No. 9 shows that the flow length is reduced and the fin hot water defect is significantly increased as compared with the alloy of the example. The fluidity increases as the amount of Si added increases. However, in manufacturing an actual heat sink, the amount of Si is determined in consideration of the balance between thermal conductivity and hot water flow depending on the shape of the fin portion.
実施例３
表１に記載の合金Ｎｏ．２（組成：Ｓｉ９．０ｗｔ％、Ｍｇ０．３０ｗｔ％、Ｆｅ０．４５ｗｔ％、Ｂ０．０１ｗｔ％）の鋳造後の鋳塊を用いて、表３に記載の温度および時間の条件で時効熱処理を実施した。鋳塊の時効熱処理前、及び時効熱処理後の導電率およびブリネル硬度値を測定し評価した結果を表３に示す。導電率及びブリネル硬度を共に良好な値とするためには、本発明で規定する温度及び時間範囲での時効熱処理条件が好ましい。
Example 3
Alloy No. 1 listed in Table 1 Using an ingot after casting (composition: Si 9.0 wt%, Mg 0.30 wt%, Fe 0.45 wt%, B 0.01 wt%), aging heat treatment was performed under the conditions of temperature and time described in Table 3 . Table 3 shows the results of measuring and evaluating the conductivity and Brinell hardness value of the ingot before aging heat treatment and after aging heat treatment. In order to make both the electrical conductivity and the Brinell hardness good values, aging heat treatment conditions in the temperature and time range specified in the present invention are preferable.
Claims (4)
A heat sink manufactured using the aluminum alloy material for a heat sink according to claim 1 and / or 2.
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