JP2004082130A - Compound forming method and compound metal product of carbon nano material and metallic material - Google Patents

Compound forming method and compound metal product of carbon nano material and metallic material Download PDF

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Publication number
JP2004082130A
JP2004082130A JP2002242292A JP2002242292A JP2004082130A JP 2004082130 A JP2004082130 A JP 2004082130A JP 2002242292 A JP2002242292 A JP 2002242292A JP 2002242292 A JP2002242292 A JP 2002242292A JP 2004082130 A JP2004082130 A JP 2004082130A
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mixed
carbon nano
injection
metal
mold
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JP3837104B2 (en
Inventor
Atsushi Koide
小出　淳
Kiyoto Takizawa
滝澤　清登
Yoshitoshi Yamagiwa
山極　佳年
Masamoto Suganuma
菅沼　雅資
Mamoru Miyagawa
宮川　守
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Nissei Plastic Industrial Co Ltd
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Nissei Plastic Industrial Co Ltd
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Priority to JP2002242292A priority Critical patent/JP3837104B2/en
Priority to US10/645,333 priority patent/US20040067153A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2061—Means for forcing the molten metal into the die using screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/28—Melting pots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
    • C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C22C2026/002—Carbon nanotubes

Abstract

<P>PROBLEM TO BE SOLVED: To form a carbon nano material and a metallic material mixed granular bodies and realize injection molding of a metallic product having characteristics of the carbon nano material by compounding the mixed granular bodies as a forming material. <P>SOLUTION: A carbon nano material 1 and a metallic material 2 are mixed with each other in a powder state. The mixed material 4 is formed into granules after solidifying the mixed material by a hot press. The mixed granules 7 are injection-charged into a metallic mold 9 by melting the mixed granules 7, and the compound metallic product 10 made of the carbon nano material and the metallic material is formed by the metallic mold 9. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、カーボンナノ材と金属材料とを射出成形により複合化する成形方法と複合金属製品に関するものである。
【０００２】
【発明が解決しようとする課題】
結晶性カーボン材の一種であるカーボンナノ材は、熱伝導率がアルミニウム（Ａｌ）、マグネシウム（Ｍｇ）等の金属の約５倍と高く、導電性も良好で、摩擦係数も低いことから摺動性にも優れるなどの特性を有する。しかし、カーボンナノ材は極めて微細なものであることから、その利用には他物質との複合化がよいとされている。
【０００３】
これまでに知られている複合化は、金属粉末と混合して加圧微細化し、金属粉末の粒子径が５μｍ〜１ｎｍの複合材粒子となすというものであり、その複合材粒子を加熱圧縮して複合材にホットプレス成形するというものである。このような複合手段では、ホットプレス成形により製造される複合金属製品にも限りがあるので、プレス成形では困難な電子機器の放熱部品やシールド部品、軸受などの金属製品を結晶性カーボン材との複合金属製品とするまでには至らない、という課題を有する。
【０００４】
この発明は、上記従来の課題を解決するために考えられたものであって、その目的は、カーボンナノ材と金属材料との複合化を射出成形により可能となして、製品サイズや形態の制限を受けることなく、カーボンナノ材の特性を金属製品に付与し、電子機器の部品として要求される高熱伝導率、良導電性、摺動性などの機能の向上を図ることができる新たな複合成形方法と複合金属製品とを提供することにある。
【０００５】
【課題を解決するための手段】
上記目的によるこの発明の複合成形方法は、カーボンナノ材と金属材料とを粉体の状態で混合し、その混合材料をホットプレスにより固形化したのち粒体に成形し、その混合粒体を溶融して金型に射出充填し、その金型によりカーボンナノ材と金属材料とによる複合金属製品に成形してなるというものであり、上記金属材料は低融点金属からなるというものである。また上記混合粒体の溶融及び金型への射出充填は、インラインスクリュ式射出装置又はプリプラ式射出装置により行うというものでもある。さらに複合金属製品は上記成形方法により成形されてなるというものである。
【０００６】
上記構成によれば、カーボンナノ材と金属材料とを混合粒体に成形し、これを成形材料とすることから、複合成形に際する材料供給が容易となり、またスクリュによる溶融混練も短時間で効率よく行えるので、均質な複合製品を成形することができる。また複合金属製品は射出成形によって完成されるので成形精度が高いものとなり、製品形態及び製品サイズもプレス成形と異なって制限を受けないので、高熱伝導率、良導電性、低摩擦係数などの機能を有する製品を容易に成形することができる。
【０００７】
【発明の実施の形態】
先ず、カーボンナノチューブなどとして知られているカーボンナノ材１の粉体と、マグネシウム（Ｍｇ）、錫（Ｓｎ）、アルミニウム（Ａｌ）、銅（Ｃｕ）、鉛（Ｐｂ）、亜鉛（Ｚｎ）の１種又は２種以上の合金等からなる低融点の金属材料２の粉体を、混合装置３に投入して攪拌混合する。この混合は不活性ガス雰囲気中で行うのが好ましい。市販のものとしては、直径１０ｎｍ（０．０１μｍ）、長さ１〜１０μｍのカーボンナノチューブがある。
【０００８】
次に、その混合材料４をホットプレス装置５に移し、加熱圧縮により板状の固形材料６に成形したのち、固形材料６をペレット又はチップ等の混合粒体７に成形し、この混合粒体７を成形材料として、射出装置８と製品の金型９とを備えた射出成形機に供給する。
【０００９】
上記射出装置８は、先端にノズル８１を有する加熱筒８２の内部に、逆止弁付きの射出スクリュ８３を回転かつ進退自在に備える。また加熱筒８２の後部上に穿設した供給口の上に、ホッパー８４が取り付けてある。このホッパー８４から加熱筒８２に供給された混合粒体７はスクリュ回転により溶融・混練されてスクリュ先端へと圧送され、内圧によるスクリュ後退により加熱筒８２の先端部内に溶融状態で計量（蓄積）されたのち、スクリュ前進により溶融材料として上記製品金型９に射出充填される。なお加熱筒８２の内部空間は、酸化防止のために不活性ガス雰囲気としておくのが好ましい。
【００１０】
上記金型９は、図示しない型締装置の固定盤９１と可動盤９２とに取り付けた開閉自在な一対の分割型９３からなり、その内部に二組の製品形態を形成するキャビティ９４と、両キャビティ９４の中央に位置して上記ノズル８１が当接されたスプル９５とを有する。このノズル８１から射出充填された溶融材料は、スプル９５から両キャビティ９４に充填されて、カーボンナノ材１と金属材料２とが均一に複合化した複合金属製品１０となる。
【００１１】
上記実施形態では、インラインスクリュ式射出装置８を採用して、射出スクリュ８３により混合粒体７の溶融・混練と金型９への射出充填を行っているが、樹脂の成形に用いられているプリプラ式射出装置を採用して効率よく行うことができる。
【００１２】
図２に示すように、通常構造のプリプラ式射出装置は、溶融・混練シリンダ１１内に溶融・混練スクリュ１２を内装し、シリンダ後部上にホッパー１３を備えた溶融・混練装置１４と、射出シリンダ１５内に射出プランジャ１６を進退自在に内装した射出装置１７とを並設し、その両方を先端部にわたり設けた開閉バルブ１９を備える流通路１８により互いに連通した構造からなる。
【００１３】
したがって成形工程としては、溶融・混練装置１４により混合粒体の溶融・混練を行い、それを射出シリンダ１５の前部内に圧送して計量し、計量後に流通路１８の開閉バルブ１９を閉じて、射出装置１７では射出プランジャ１６の前進によるノズル２０から金型９への射出充填を行う。溶融・混練装置１４では射出充填中に、供給された混合粒体７の溶融・混練が開始される。このようなことから溶融・混練と射出の両方を行うインラインスクリュ式射出装置よりも、カーボンナノ材１と金属材料２とが均一に複合化した上記複合金属製品１０の成形が効率よく行えるようになる。
【図面の簡単な説明】
【図１】この発明に係わるカーボンナノ材と低融点金属との複合金属製品の成形方法の工程図である。
【図２】この発明の成形方法に用いられるプリプラ式射出装置の略示断面図である。
【符号の説明】
１　　カーボンナノ材
２　　樹脂のバインダー
３　　混合装置
４　　混合材料
５　　ホットプレス装置
６　　固形材料
７　　粒状材料
８　　射出装置
９　　製品金型
１０　　複合金属製品
１４　　溶融・混練装置
１７　　射出装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding method for compounding a carbon nanomaterial and a metal material by injection molding, and a composite metal product.
[0002]
[Problems to be solved by the invention]
Carbon nanomaterials, which are a kind of crystalline carbon materials, have thermal conductivity about 5 times higher than metals such as aluminum (Al) and magnesium (Mg), good conductivity, and low friction coefficient. It has properties such as excellent properties. However, since carbon nanomaterials are extremely fine, it is said that their use should be combined with other materials.
[0003]
The known composite method is to mix with a metal powder and make it finer under pressure to form a composite material particle having a particle diameter of 5 μm to 1 nm. The composite material particle is heated and compressed. Hot-press forming into a composite material. In such a composite means, there is a limit to composite metal products manufactured by hot press molding, and metal products such as heat dissipating parts, shield parts, and bearings of electronic equipment, which are difficult to press molding, are combined with a crystalline carbon material. There is a problem that it does not lead to a composite metal product.
[0004]
The present invention has been conceived in order to solve the above-mentioned conventional problems, and an object of the present invention is to allow a composite of a carbon nanomaterial and a metal material to be formed by injection molding, thereby restricting the product size and form. A new composite molding that can impart the properties of carbon nanomaterials to metal products without suffering and improve the functions such as high thermal conductivity, good conductivity, and slidability required for electronic device parts It is to provide a method and a composite metal product.
[0005]
[Means for Solving the Problems]
According to the composite molding method of the present invention for the above object, a carbon nano material and a metal material are mixed in a powder state, the mixed material is solidified by hot pressing, and then molded into granules, and the mixed granules are melted. Then, the mixture is injection-filled into a mold, and the composite mold is formed into a composite metal product of a carbon nano material and a metal material by the mold, and the metal material is made of a low melting point metal. The melting of the mixed granules and the injection filling into the mold are performed by an in-line screw type injection device or a pre-plastic type injection device. Further, the composite metal product is formed by the above-mentioned forming method.
[0006]
According to the above configuration, since the carbon nano material and the metal material are formed into a mixed granule and this is used as a molding material, material supply during composite molding becomes easy, and melting and kneading with the screw can be performed in a short time. Since it can be performed efficiently, a homogeneous composite product can be formed. In addition, since composite metal products are completed by injection molding, molding accuracy is high, and product form and product size are not limited unlike press molding, so functions such as high thermal conductivity, good conductivity, low friction coefficient etc. Can be easily formed.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
First, a powder of carbon nano material 1 known as a carbon nanotube or the like and magnesium (Mg), tin (Sn), aluminum (Al), copper (Cu), lead (Pb), zinc (Zn) The powder of the low melting point metal material 2 made of a kind or two or more kinds of alloys is charged into the mixing device 3 and mixed with stirring. This mixing is preferably performed in an inert gas atmosphere. Commercially available carbon nanotubes have a diameter of 10 nm (0.01 μm) and a length of 1 to 10 μm.
[0008]
Next, the mixed material 4 is transferred to a hot press device 5 and formed into a plate-shaped solid material 6 by heating and compression, and then the solid material 6 is formed into a mixed granule 7 such as pellets or chips. 7 is supplied as a molding material to an injection molding machine equipped with an injection device 8 and a product mold 9.
[0009]
The injection device 8 is provided with an injection screw 83 having a check valve inside a heating cylinder 82 having a nozzle 81 at the tip so as to rotate and advance and retreat. Further, a hopper 84 is mounted on a supply port formed in a rear portion of the heating cylinder 82. The mixed granular material 7 supplied from the hopper 84 to the heating cylinder 82 is melted and kneaded by the rotation of the screw and is fed to the tip of the screw by pressure. After that, the screw is advanced and injected into the product mold 9 as a molten material by injection. Note that the interior space of the heating cylinder 82 is preferably set to an inert gas atmosphere to prevent oxidation.
[0010]
The mold 9 includes a pair of openable and closable split dies 93 mounted on a fixed plate 91 and a movable plate 92 of a mold clamping device (not shown), and a cavity 94 forming two sets of product forms therein, A sprue 95 is provided at the center of the cavity 94 and in contact with the nozzle 81. The molten material injected and filled from the nozzle 81 is filled into the two cavities 94 from the sprue 95 to form the composite metal product 10 in which the carbon nanomaterial 1 and the metal material 2 are uniformly composited.
[0011]
In the above embodiment, the in-line screw type injection device 8 is employed to melt and knead the mixed granules 7 and to perform injection filling into the mold 9 by the injection screw 83, but this is used for resin molding. It can be performed efficiently by employing a pre-plastic injection device.
[0012]
As shown in FIG. 2, a pre-plastic injection apparatus having a normal structure includes a melting / kneading apparatus 14 having a melting / kneading screw 12 inside a melting / kneading cylinder 11 and a hopper 13 on a rear portion of the cylinder, and an injection cylinder. An injection device 17 in which an injection plunger 16 is provided so as to be able to move forward and backward is arranged in the inside of the device 15, and both are connected to each other by a flow passage 18 provided with an opening / closing valve 19 provided at a distal end portion.
[0013]
Therefore, as a molding step, the mixed and granulated material is melted and kneaded by the melting and kneading device 14, and the melted and kneaded material is fed into the front portion of the injection cylinder 15 and measured. After the measurement, the opening and closing valve 19 of the flow passage 18 is closed. The injection device 17 performs injection filling from the nozzle 20 to the mold 9 as the injection plunger 16 advances. In the melting and kneading apparatus 14, the melting and kneading of the supplied mixed granules 7 is started during the injection filling. For this reason, the composite metal product 10 in which the carbon nanomaterial 1 and the metal material 2 are uniformly composited can be formed more efficiently than an inline screw type injection device that performs both melting / kneading and injection. Become.
[Brief description of the drawings]
FIG. 1 is a process diagram of a method for forming a composite metal product of a carbon nanomaterial and a low melting point metal according to the present invention.
FIG. 2 is a schematic cross-sectional view of a pre-plastic injection device used in the molding method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carbon nano material 2 Resin binder 3 Mixing device 4 Mixing material 5 Hot press device 6 Solid material 7 Granular material 8 Injection device 9 Product mold 10 Composite metal product 14 Melting / kneading device 17 Injection device

Claims (4)

カーボンナノ材と金属材料とを粉体の状態で混合し、その混合材料をホットプレスにより固形化したのちチップ、ペレット等の粒体に成形し、その混合粒体を溶融混練して金型に射出充填し、その金型によりカーボンナノ材と金属材料とによる複合金属製品に成形してなることを特徴とするカーボンナノ材と金属材料の複合成形方法。The carbon nanomaterial and the metal material are mixed in a powder state, and the mixed material is solidified by hot pressing, then molded into chips, pellets and other granules, and the mixed granules are melt-kneaded into a mold. A composite molding method of a carbon nano material and a metal material, characterized by being injection-filled and molded into a composite metal product of a carbon nano material and a metal material by a mold. 上記混合粒体の溶融・混練及び金型への射出充填は、インラインスクリュ式射出装置又はプリプラ式射出装置により行うことを特徴とする請求項１記載のカーボンナノ材と金属材料の複合成形方法。2. The method according to claim 1, wherein the melting and kneading of the mixed particles and the injection filling into a mold are performed by an in-line screw injection device or a pre-plastic injection device. 上記金属材料は低融点金属からなることを特徴とする請求項１又は２記載のカーボンナノ材と金属材料との複合成形方法。3. The method according to claim 1, wherein the metal material comprises a low melting point metal. 上記請求項１〜３に記載の何れかの成形方法により成形された金属製品からなることを特徴とするカーボンナノ材と金属材料の複合金属製品。A composite metal product of a carbon nanomaterial and a metal material, comprising a metal product formed by the forming method according to any one of claims 1 to 3.
JP2002242292A 2002-08-22 2002-08-22 Composite molding method of carbon nanomaterial and metal material and composite metal product Expired - Fee Related JP3837104B2 (en)

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