JP6537130B2 - Method of manufacturing plated composite material - Google Patents

Method of manufacturing plated composite material Download PDF

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JP6537130B2
JP6537130B2 JP2015020018A JP2015020018A JP6537130B2 JP 6537130 B2 JP6537130 B2 JP 6537130B2 JP 2015020018 A JP2015020018 A JP 2015020018A JP 2015020018 A JP2015020018 A JP 2015020018A JP 6537130 B2 JP6537130 B2 JP 6537130B2
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plating
cathode
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composite material
diamond
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JP2016141862A (en
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新井 進
進 新井
美代加 植田
美代加 植田
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Shinshu University NUC
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本発明は、ダイヤモンド粒子等の分散粒子をめっきマトリックス中に含むめっき複合材料の製造方法に関する。   The present invention relates to a method of producing a plated composite material including dispersed particles such as diamond particles in a plating matrix.

CPU等のきわめて放熱量の大きな半導体素子を搭載した電子装置では、ヒートシンクやヒートスプレッダーといった放熱部品を用いて、半導体素子から発生する熱量を効率的に放散させている。これらの放熱部品の素材には、熱伝導性に優れる銅やアルミニウムが使用される。
本発明者は、めっき金属中にカーボン繊維、カーボンナノチューブ、ダイヤモンド粒子等の分散粒子を分散させて取り込む複合めっきについて研究している。これらの複合めっきのうち、ダイヤモンド粒子をめっき金属中に分散させた複合材料は、きわめて熱伝導性に優れることから、ヒートシンクやヒートスプレッダー等の放熱部品として効果的に利用することができる。ダイヤモンドの熱伝導率900(W/mK)は、銅の熱伝導率398(W/mK)の約3倍であり、めっき金属中にダイヤモンド粒子を均一に分散させることにより、好適な複合材料となる。
In an electronic device on which a semiconductor element such as a CPU or the like with a very large amount of heat radiation is mounted, heat dissipation components such as a heat sink or a heat spreader are used to efficiently dissipate the heat generated from the semiconductor element. Copper and aluminum excellent in thermal conductivity are used as materials of these heat dissipation parts.
The present inventor is studying composite plating in which dispersed particles such as carbon fibers, carbon nanotubes, diamond particles and the like are dispersed and taken into plated metal. Among these composite platings, a composite material in which diamond particles are dispersed in a plating metal is extremely excellent in thermal conductivity, and thus can be effectively used as a heat dissipation component such as a heat sink or a heat spreader. The thermal conductivity 900 (W / mK) of diamond is about 3 times the thermal conductivity 398 (W / mK) of copper, and by uniformly dispersing the diamond particles in the plating metal, a suitable composite material and Become.

特許文献1にはめっき金属中にダイヤモンド粒子を含む複合材料が開示されている。この複合めっき材料はめっき皮膜の厚さ方向にダイヤモンド粒子の共析量が漸次変化する傾斜機能材料として形成したもので、ダイヤモンド粒子の共析量を傾斜組成とすることにより、めっき皮膜の放熱性を向上させ、基材との密着性を向上させることを可能としている。このめっき複合材料は、めっき液の撹拌速度を細かく調節して製造している。   Patent Document 1 discloses a composite material containing diamond particles in a plated metal. This composite plating material is formed as a functionally gradient material in which the amount of eutectic particles of diamond particles gradually changes in the thickness direction of the plating film, and by setting the amount of eutectic particles of diamond particles to a gradient composition, the heat dissipation of the plated film It is possible to improve the adhesion to the substrate by improving the This plated composite material is manufactured by finely adjusting the stirring speed of the plating solution.

特許第5006993号公報Patent No. 5006993 gazette

めっき金属中にダイヤモンド粒子を分散させた複合材料を得る方法として、めっき液の撹拌速度を調節してめっきする方法(特許文献1)は、種々変化するめっき条件に合わせて撹拌速度を的確に設定することが難しいという問題がある。
本発明者は、ダイヤモンド粒子を分散させためっき複合材料を得る方法として、ダイヤモンド粒子を含むめっき液中に、陽極と陰極とを鉛直方向の上位置と下位置に水平に対向させて配置し、陰極上にダイヤモンド粒子を徐々に沈降させて堆積させながらめっきする方法を検討している。
As a method of obtaining a composite material in which diamond particles are dispersed in the plating metal, the method of plating while adjusting the stirring speed of the plating solution (Patent Document 1) accurately sets the stirring speed in accordance with various changing plating conditions. There is a problem that it is difficult to do.
As a method of obtaining a plated composite material in which diamond particles are dispersed, the present inventor arranges an anode and a cathode horizontally opposite to each other at the upper position and the lower position in the plating solution containing the diamond particles, The method of plating while gradually depositing and depositing diamond particles on the cathode is under consideration.

電極(陰極)上にダイヤモンド粒子を堆積させながらめっき複合材料を形成するには、堆積したダイヤモンド粒子間の隙間をめっき金属で充填しながらめっきする必要がある。ダイヤモンド粒子に限らず、シリカ粒子、カーボン繊維、カーボンナノチューブといった無機物や、樹脂粒子等の有機物を電極上に堆積させながらめっき複合材料を形成するには、的確にめっき条件を設定しないと、分散粒子の間の隙間部分がめっきによって完全に充填されず、複合材料中にボイド(空隙)が生じたりして、複合材料に求められる強度や熱伝導率といった所要の特性が得られないという問題がある。   In order to form a plated composite while depositing diamond particles on an electrode (cathode), it is necessary to fill the gaps between the deposited diamond particles while filling with a plating metal. In order to form a plating composite material while depositing an inorganic substance such as silica particles, carbon fibers, carbon nanotubes, or an organic substance such as resin particles as well as diamond particles, dispersed particles are not properly set. There is a problem that the gap between the parts is not completely filled by plating and voids (voids) are generated in the composite material and required characteristics such as strength and thermal conductivity required for the composite material can not be obtained. .

本発明は、めっき複合材料を作製する際の課題を解決すべくなされたものであり、めっき複合材料中にボイドを生じさせずに、分散粒子間の隙間がめっきにより確実に充填されためっき複合材料を得ることができるめっき複合材料の製造方法を提供することを目的とする。   The present invention has been made to solve the problems in producing a plated composite material, and a plated composite in which the gaps between dispersed particles are reliably filled by plating without causing voids in the plated composite material. An object of the present invention is to provide a method for producing a plated composite material from which a material can be obtained.

本発明に係るめっき複合材料の製造方法は、めっき槽内の鉛直方向の上位置に陽極、下位置に陰極を、電極面の向きを水平方向として互いに対向させて配置し、めっき液中に分散させた分散粒子を前記陰極に向け徐々に沈降させ、陰極上に堆積させるとともに、陰極上にめっき金属を析出させることにより、めっきマトリックス中に前記分散粒子が含まれためっき複合材料を作製する方法であって、前記分散粒子がダイヤモンド粒子であり、前記陰極上にめっきを析出させる際に、電位規制法により前記陰極の電位を水素が発生しない電位に設定し、水素の還元電位よりも正側の電位で析出可能なめっきを施すことを特徴とする。 The manufacturing method of the plating composite material according to the present invention is disposed in the plating solution by disposing the anode at the upper position in the vertical direction in the plating tank and the cathode at the lower position with the electrode surface facing horizontally. Of the dispersed particles are gradually precipitated toward the cathode and deposited on the cathode, and a plating metal is deposited on the cathode, thereby producing a plated composite material including the dispersed particles in a plating matrix When the dispersed particles are diamond particles and the plating is deposited on the cathode, the potential of the cathode is set to a potential at which hydrogen is not generated by the potential regulation method , and the positive side of the reduction potential of hydrogen Plating that can be deposited at a potential of

めっき複合材料に含まれる分散粒子とは、めっきマトリックス中に含まれる粒子であり、本発明においてはダイヤモンド粒子を使用する。めっきマトリックス中に含まれる分散粒子の大きさや形状は均一であるとは限らない。 The dispersed particles contained in the plated composite material are particles contained in a plating matrix, and in the present invention, diamond particles are used. The size and shape of the dispersed particles contained in the plating matrix are not necessarily uniform.

本発明方法においては、電位規制法により陰極上にめっきを析出させてめっき複合材料を作製する。電位規制法によるめっきは、めっき時に、電極の電位を特定の電位に規制(保持)してめっきする方法である。電位規制法によるめっき方法によれば、陰極の電位を電極から水素が発生しない電位に設定してめっきすることが可能であり、陰極の電位をめっき時に水素が発生しない電位に規制することにより、めっき時に水素が発生してめっき金属にボイドが生じたり、発生した水素によって分散粒子が浮き上がったりすることを防止し、隣り合った分散粒子の間の隙間がめっき金属により確実に充填される。   In the method of the present invention, plating is deposited on the cathode by a potential control method to prepare a plated composite material. Plating by the potential control method is a method of plating by regulating (holding) the potential of the electrode to a specific potential at the time of plating. According to the plating method by the potential regulation method, it is possible to perform plating by setting the potential of the cathode to a potential at which hydrogen is not generated from the electrode, and regulating the potential of the cathode at a potential at which hydrogen is not generated at plating. At the time of plating, hydrogen is generated to prevent voids in the plated metal and floating of the dispersed particles due to the generated hydrogen is prevented, and gaps between adjacent dispersed particles are surely filled with the plated metal.

電位規制法によるめっきでは、とくにめっきの種類が限定されるものではなく、銅めっき、銀めっき、金めっき、ニッケルめっき、スズめっき等のめっきが可能である。ただし、電位規制法によるめっき方法により水素を発生させずにめっきするには、水素の還元電位よりも正側の電位で析出可能となるように、めっきの種類や、使用するめっき液、使用する電極等のめっき条件を選択する必要がある。
In the plating by the potential control method, the type of plating is not particularly limited, and plating such as copper plating, silver plating, gold plating, nickel plating, tin plating and the like is possible. However, in order to plate without generating hydrogen by the plating method according to the potential regulation method, the type of plating, the plating solution to be used, and the plating are used so that deposition can be performed on the positive side of the reduction potential of hydrogen. It is necessary to select plating conditions such as electrodes.

前述したように分散粒子には種々の材質、大きさ、形状の粒子を使用することができるが、ダイヤモンド粒子は電気的、化学的に安定的な粒子であることから、めっき液中に容易に分散させることができ、ダイヤモンド粒子を分散させためっき複合材料を容易に得ることができる。
また、銅からなるめっきマトリックス中にダイヤモンド粒子を含むめっき複合材料は、銅よりも優れた熱伝導率を備える点で好適に利用することができる。とくに、粒径(粒子の平均の大きさ)が45μm以上のダイヤモンド粒子を使用しためっき複合材料は、ダイヤモンド粒子とめっきマトリックス金属との密着性が良好であり、複合材料中にボイド(空隙)がないことから、銅材の数倍の熱伝導率を備える複合材料として得ることができ、熱放散材料等として好適に利用することができる。
As described above, particles of various materials, sizes, and shapes can be used for dispersed particles, but diamond particles are electrically and chemically stable particles, so they can easily be added to a plating solution. It can be dispersed, and a plated composite material in which diamond particles are dispersed can be easily obtained.
Moreover, the plating composite material which contains a diamond particle in the plating matrix which consists of copper can be suitably utilized in the point provided with the thermal conductivity superior to copper. In particular, a plated composite material using diamond particles having a particle size (average particle size) of 45 μm or more has good adhesion between the diamond particles and the plating matrix metal, and voids (voids) are present in the composite material. Since it does not exist, it can be obtained as a composite material having a thermal conductivity several times that of a copper material, and can be suitably used as a heat dissipation material or the like.

本発明に係るめっき複合材料の製造方法は、めっきにより複合材料を形成するから、めっきを形成した基材(電極)からめっき複合材料を外し、めっき複合材料として利用することも可能であるし、銅板等の基材上にめっき複合材料を形成し、基材を含めてめっき複合材料とすることもできる。めっき法により複合材料を形成できることから、熱放散性にすぐれた材料(部品)を製造することも容易である。   Since the method of producing a plated composite material according to the present invention forms the composite material by plating, it is possible to remove the plated composite material from the substrate (electrode) on which the plating is formed and use it as a plated composite material. The plated composite material may be formed on a substrate such as a copper plate, and the substrate may be included in the plated composite material. Since the composite material can be formed by the plating method, it is easy to manufacture a material (part) excellent in heat dissipation.

本発明に係るめっき複合材料の製造方法によれば、めっきマトリックス中に含まれる分散粒子の間の隙間がめっき金属により充填され、ボイドが残留しない複合材料として確実に得ることができ、熱放散用等として好適に利用することができる。   According to the method of producing a plating composite material according to the present invention, the gaps between the dispersed particles contained in the plating matrix can be filled with the plating metal and reliably obtained as a composite material in which voids do not remain. It can be suitably used as etc.

めっき装置の構成例を示す説明図である。It is an explanatory view showing an example of composition of a plating device. 陰極にめっき金属が析出される様子を示す説明図である。It is explanatory drawing which shows a mode that plating metal is deposited on a cathode. 粒径が異なるダイヤモンド粒子のSEM画像である。It is a SEM image of the diamond particle from which a particle size differs. 電位規制法により得られた銅−ダイヤモンド複合材料の表面のSEM像である。It is a SEM image of the surface of the copper-diamond composite material obtained by the potential regulation method. 電流規制法により得られた銅−ダイヤモンド複合材料の表面のSEM像である。It is a SEM image of the surface of the copper-diamond composite material obtained by the current regulation method. 電流規制法により銅−ダイヤモンド複合材料を作製した際の陰極電位の変化を示すグラフである。It is a graph which shows the change of the cathode potential at the time of producing a copper- diamond composite material by the current regulation method. 電位規制法により作製した銅−ダイヤモンド複合材料について熱伝導率を測定した結果を示すグラフである。It is a graph which shows the result of having measured the thermal conductivity about the copper- diamond composite material produced by the potential regulation method. 電流規制法により作製した銅−ダイヤモンド複合材料について熱伝導率を測定した結果を示すグラフである。It is a graph which shows the result of having measured the thermal conductivity about the copper- diamond composite material produced by the current regulation method.

図1は本発明に係るめっき複合材料の製造方法を適用する場合のめっき装置の構成例を示す。図1は、めっき槽10に陽極12と陰極14とを配置し、陽極12と陰極14とを電源に接続した構成を示す。陽極12と陰極14は、めっき液を収容するめっき槽10の槽内に、鉛直方向の上位置に陽極12、下位置に陰極14とし、それぞれ電極面を水平方向として、互いに電極面を対向させて配置する。   FIG. 1 shows a configuration example of a plating apparatus in the case of applying the method for producing a plating composite material according to the present invention. FIG. 1 shows a configuration in which an anode 12 and a cathode 14 are disposed in a plating tank 10, and the anode 12 and the cathode 14 are connected to a power supply. The anode 12 and the cathode 14 are disposed in the bath of the plating bath 10 containing the plating solution, with the anode 12 at the upper position in the vertical direction and the cathode 14 at the lower position, with the electrode faces in the horizontal direction and the electrode faces facing each other. Place.

図1のめっき装置では、陽極12として、平板状の導体を側面方向から見てL字形に折曲した形態のものを使用している。陽極12のL字形に折曲した面を、陰極14の対向面と同一形状とし、陰極14の電極面と平行に対向させて配置する。
陰極14の電極面の向きを水平方向としているのは、めっき液中に分散させた分散粒子が重力により陰極14上に沈降して、堆積するようにするためである。陽極12は陰極14に対向配置するから、陽極12の面方向も水平方向になる。
複合めっき材料として、銅−ダイヤモンド複合材料を作製する際には、ダイヤモンド粒子を分散させためっき液を使用してめっきすればよい。
In the plating apparatus of FIG. 1, as the anode 12, a plate-like conductor is used which is bent in an L shape as viewed from the side direction. The L-shaped bent surface of the anode 12 has the same shape as the facing surface of the cathode 14 and is disposed to face in parallel with the electrode surface of the cathode 14.
The reason why the direction of the electrode surface of the cathode 14 is horizontal is to cause dispersed particles dispersed in the plating solution to settle on the cathode 14 by gravity and to be deposited. Since the anode 12 is disposed to face the cathode 14, the surface direction of the anode 12 is also horizontal.
When producing a copper-diamond composite material as a composite plating material, plating may be performed using a plating solution in which diamond particles are dispersed.

図1において、陰極14は導体板(たとえば銅板)をL字形に折曲して電極としている。陽極12に対向配置する陰極14の折曲片14aに連結する延出片14bをめっき槽10の上方に延出させ、電源のマイナス側と延出片14とを接続する。図示例では、延出片14bの表面にめっきされないように、めっき槽10に浸漬される延出片14bの表面をマスキングテープ14cで被覆している。   In FIG. 1, the cathode 14 is an electrode formed by bending a conductor plate (for example, a copper plate) into an L shape. An extension piece 14b connected to the bent piece 14a of the cathode 14 disposed opposite to the anode 12 is extended above the plating tank 10 to connect the minus side of the power supply to the extension piece 14. In the illustrated example, the surface of the extended piece 14b to be immersed in the plating tank 10 is covered with a masking tape 14c so that the surface of the extended piece 14b is not plated.

本発明に係るめっき複合材料の製造方法において、めっき装置における陽極と陰極の配置は図1に示す構成に限定されるものではない。ただし、めっき時に分散粒子を陰極上に沈降させ、陰極上に徐々に分散粒子を堆積させながらめっきするから、めっき槽内で陽極と陰極とを対向させ、めっき槽内の上位置に陽極を下位置に陰極を配置して、陰極上に分散粒子を堆積させるようにしてめっきする。   In the method of producing a plated composite material according to the present invention, the arrangement of the anode and the cathode in the plating apparatus is not limited to the configuration shown in FIG. However, since dispersed particles are precipitated on the cathode during plating and the dispersed particles are gradually deposited on the cathode, the anode and the cathode are opposed in the plating tank, and the anode is lowered at the upper position in the plating tank. The cathode is placed in position and plated in such a way as to deposit dispersed particles on the cathode.

図1に示すめっき装置を用いてめっき複合材料を作製するめっき操作は、分散粒子(ダイヤモンド粒子)を混合しためっき液をめっき槽10に収容し、めっき液を撹拌してめっき液中で分散粒子を均一に分散させた後、陽極12と陰極14との間に電流を通じることによって行う。
分散粒子(ダイヤモンド粒子)が均一に分散されためっき複合材料を得るには、めっき液中で分散粒子が均一に分散されている必要がある。ダイヤモンド粒子のような、電気的にも化学的にも安定な分散粒子を用いれば、めっき液を撹拌することにより、分散粒子が相互に凝集せず、好適に分散粒子を分散させることができる。
In the plating operation of preparing a plating composite material using the plating apparatus shown in FIG. 1, a plating solution in which dispersed particles (diamond particles) are mixed is contained in the plating tank 10, and the plating solution is agitated to disperse the particles in the plating solution. Are uniformly dispersed, and then current is passed between the anode 12 and the cathode 14.
In order to obtain a plated composite material in which dispersed particles (diamond particles) are dispersed uniformly, dispersed particles need to be dispersed uniformly in a plating solution. If dispersed particles which are electrically and chemically stable, such as diamond particles, are used, the dispersed particles can be dispersed appropriately without stirring each other by stirring the plating solution.

めっき液の撹拌を停止すると、めっき液中の分散粒子は重力の作用により徐々に沈降を開始し、陰極14上に堆積し始める。
図2は、陰極14上に分散粒子20が堆積しはじめ、陰極14上にめっき金属22が析出する様子を説明的に示したものである。
図2(a)は、陰極14上に分散粒子20が沈降して、分散粒子20が一層(一段)堆積し、陰極14上にめっき金属(銅めっき)22が析出しはじめた状態である。めっき金属22は、陰極14の表面から、分散粒子20の隙間を埋めるように析出する。めっき金属は、分散粒子が絶縁体であっても導体であっても、分散粒子の隙間を埋めるように析出させることが可能である。ただし、分散粒子がシリカ等の絶縁体の場合の方が、導体の場合よりも容易に分散粒子の隙間を埋めるようにめっき金属を析出させることができる。分散粒子が導体の場合は、めっき液やめっき条件を調整してめっき金属を析出させる必要がある。
When the agitation of the plating solution is stopped, the dispersed particles in the plating solution gradually begin to settle by the action of gravity and begin to deposit on the cathode 14.
FIG. 2 is an explanatory view showing how the dispersed particles 20 start to be deposited on the cathode 14 and the plating metal 22 is deposited on the cathode 14.
In FIG. 2A, the dispersed particles 20 settle on the cathode 14, and the dispersed particles 20 are deposited in one layer (one stage), and the plated metal (copper plating) 22 starts to be deposited on the cathode 14. The plated metal 22 is deposited from the surface of the cathode 14 so as to fill the gaps of the dispersed particles 20. The plated metal can be deposited so as to fill the gaps between the dispersed particles, regardless of whether the dispersed particles are insulators or conductors. However, when the dispersed particles are an insulator such as silica, the plated metal can be deposited so as to fill the gaps of the dispersed particles more easily than in the case of the conductor. When the dispersed particles are a conductor, it is necessary to adjust the plating solution and plating conditions to precipitate the plating metal.

図2(a)は、陰極14に沈降した分散粒子20が陰極14に接触する部位の近傍がめっきされた状態、図2(b)は、一段目の分散粒子20の1/2程度の高さまでめっきが進んだ状態、図2(c)は、さらにめっきが進み、一段目の分散粒子20の全体が隠れるまでめっきが進んだ状態を示す。
このように分散粒子20が堆積した状態で、分散粒子20の隙間を埋めるようにめっき金属22が析出するということは、めっきが析出する導体領域の面積についてみると、めっきの進行状態によって、導体領域が広がったり、狭まったりすることを意味する。一般的なめっきでは、めっき対象物は平板体のように平面上に単にめっきが析出するのみで、めっき対象となる導体領域の面積が大きく変動することはない。したがって、このようにめっき対象の導体領域の大きさが変動するような場合には、分散粒子20の隙間が確実にめっきにより充填されるようにめっき条件を設定してめっきする必要がある。
2 (a) shows a state in which the vicinity of the portion where the dispersed particles 20 precipitated on the cathode 14 come in contact with the cathode 14 is plated, and FIG. 2 (b) shows about half the height of the dispersed particles 20 of the first stage. FIG. 2C shows a state in which the plating further proceeds until the whole of the dispersed particles 20 in the first stage is hidden.
The fact that the plating metal 22 is deposited so as to fill the gaps between the dispersed particles 20 in the state where the dispersed particles 20 are deposited means that depending on the progress of plating, the conductor area will be plated. It means that the area spreads or narrows. In general plating, the object to be plated is merely plated on a flat surface like a flat plate, and the area of the conductor region to be plated does not greatly fluctuate. Therefore, in the case where the size of the conductor region to be plated fluctuates in this manner, it is necessary to perform plating by setting plating conditions so that the gaps between the dispersed particles 20 can be surely filled by plating.

図2では、説明上、分散粒子20を同一径の球体として描いているが、分散粒子20は実際には大きさや形状にばらつきがあることがふつうである。したがって、陰極14上に分散粒子20が沈降する場合も、整然と分散粒子20が整列して沈降するものではなく、また、一段ずつ積み重なるるようにして堆積するとは限らず、堆積形態もさまざまである。このように、陰極14上に堆積する分散粒子20は、仮に、粒子径をそろえるようにした場合でも、きわめて多様な形態で堆積するから、めっき途中でめっき対象の導体領域の面積が変動することは避けられない。   Although the dispersed particles 20 are drawn as spheres of the same diameter in FIG. 2 for the sake of explanation, it is usual that the dispersed particles 20 actually have variations in size and shape. Therefore, even when the dispersed particles 20 settle on the cathode 14, the dispersed particles 20 do not orderly settle in an ordered manner, and are not necessarily deposited so as to be stacked step by step, and the deposition form also varies. . As described above, even if the dispersed particles 20 deposited on the cathode 14 are deposited in various forms even if the particle diameters are made uniform, the area of the conductor region to be plated changes during plating. Is inevitable.

電解めっきにおいては、電流規制法によるめっきが一般的に採用されている。電流規制法は、陽極と陰極とに流す電流を一定としてめっきする方法である。電流規制法が一般的に採用されているのは、製造現場では、めっき対象物のめっき領域がめっきの進行とともに大きく変動するようなめっきを施す例がほとんどないこと、電流規制法は効率的なめっきが可能で安定しためっきができることによる。   In the electrolytic plating, plating by the current regulation method is generally adopted. The current regulation method is a method in which the current flowing between the anode and the cathode is constant. The current regulation method is generally adopted because in the production site, there is almost no case where plating is performed such that the plating area of the object to be plated varies greatly with the progress of plating, and the current regulation method is efficient Plating is possible and stable plating is possible.

しかしながら、電流規制法を、図2に示すような、めっきの進行とともにめっき領域が大きく変動するめっき処理に適用すると、めっき領域が変動することによって、めっき領域(導体領域)に作用する電流値が大きく変動する。すなわち、めっき電流が作用する導体領域の面積が小さくなると導体領域に集中的に電流が作用し、導体領域の面積が広がると導体領域に作用する電流が緩やかになる。電解めっきでは、めっき中にめっき液から水素が発生することがあり、とくにめっき領域に電流が集中して作用すると、水素が発生しやすくなり、発生した水素が分散粒子20を浮き上がらせるように作用し、めっき金属22にボイドを発生させるという問題が生じる。   However, when the current regulation method is applied to a plating process in which the plating area greatly varies with the progress of plating as shown in FIG. 2, the current value acting on the plating area (conductor area) is It fluctuates greatly. That is, when the area of the conductor area on which the plating current acts is reduced, the current acts intensively on the conductor area, and when the area of the conductor area is expanded, the current acting on the conductor area becomes gentle. In electrolytic plating, hydrogen may be generated from the plating solution during plating, and in particular, when current concentrates on the plating area, it becomes easy to generate hydrogen and the generated hydrogen acts so that the dispersed particles 20 are lifted. As a result, the plating metal 22 has a problem of generating a void.

めっき時に、めっき複合材料中にボイド(空隙)が発生すると、めっき後の複合材料の内部に空隙が残り、たとえば、銅−ダイヤモンド複合材料では、ダイヤモンド粒子と銅との間に空隙が残ったりすることにより、十分な熱伝導率が得られなかったり、所要の強度が得られなかったりするという問題が生じる。   During plating, if voids (voids) are generated in the plated composite, voids remain inside the composite after plating, for example, in the case of a copper-diamond composite, voids remain between diamond particles and copper. This causes a problem that a sufficient thermal conductivity can not be obtained or a required strength can not be obtained.

本発明に係るめっき複合材料の製造方法は、電解めっきを施す際に水素が発生することを抑制し、めっき複合材料中にボイドが生じることを防止し、電流効率を向上させることを可能にするため、電位規制法によるめっきを利用してめっき複合材料を製造することを特徴とする。
電位規制法は、水素が発生する陰極の電位を、めっき時に一定の電位に規制して(一定の電位に保持して)めっきする方法である。この電位規制法によるめっき方法を利用すると、めっき時にめっき対象領域(導体領域)の面積が大きく変動する場合でも、陰極から水素を発生させずに確実にめっきすることができる。電位規制法により陰極の電位を規制することにより、めっき時に水素が発生することを防止することができ、複合材料中にボイドが発生することを防止し、まためっき時の電流効率を向上させることができる。
The method for producing a plating composite material according to the present invention suppresses generation of hydrogen when performing electrolytic plating, prevents generation of a void in the plating composite material, and makes it possible to improve current efficiency. Therefore, the present invention is characterized in that a plated composite material is manufactured using plating by the potential control method.
The potential regulation method is a method in which plating is performed by regulating the potential of the cathode at which hydrogen is generated to a constant potential (while holding the potential at a constant potential). By using the plating method according to the potential regulation method, even if the area of the region to be plated (conductor region) fluctuates greatly during plating, plating can be reliably performed without generating hydrogen from the cathode. By regulating the potential of the cathode by the potential regulation method, it is possible to prevent the generation of hydrogen at the time of plating, to prevent the generation of voids in the composite material, and to improve the current efficiency at the time of plating. Can.

本発明に係るめっき複合材料の製造方法を適用した例として、銅−ダイヤモンド複合材料をめっきにより製造した例について説明する。以下では、電流規制法と電位規制法により、銅−ダイヤモンド複合材料を作製した例について対比しながら説明する。   The example which manufactured the copper-diamond composite material by plating as an example to which the manufacturing method of the plating composite material concerning the present invention is applied is explained. Below, it demonstrates, contrasting the example which produced the copper- diamond composite material by the current regulation method and the electric potential regulation method.

(めっき浴)
めっき浴には、電流規制法と電位規制法とも共通に、下記のめっき浴を使用した。
CuSO4・5H2O 0.85M
H2SO4 0.55M
ダイヤモンド粒子 平均粒子径 10、25、45、195、230μm
めっき浴は、溶液にダイヤモンド粒子を加えてダイヤモンド粒子を懸濁させたものである。ダイヤモンド粒子の粒径による熱伝導率の差異を調べるため、平均粒子径が異なる(10、25、45、195、230μm)ダイヤモンド粒子を加えためっき浴をそれぞれ調製して使用した。
めっき液は、100mLビーカーを用いて、100mLのめっき液中に表1の分量のダイヤモンド粒子を混合・撹拌した後、めっき槽に注いで使用した。実施例で使用したダイヤモンド粒子の添加量は、めっき槽の底面(底面積:3.5cm×7cm)にダイヤモンド粒子を充填率64%で2層積み上げる量に相当する。
(Plating bath)
As the plating bath, the following plating bath was used in common with both the current regulation method and the potential regulation method.
CuSO 4 · 5H 2 O 0.85M
H 2 SO 4 0.55 M
Diamond particles Average particle size 10, 25, 45, 195, 230 μm
The plating bath is one in which diamond particles are added to a solution to suspend the diamond particles. In order to investigate the difference in thermal conductivity depending on the particle size of the diamond particles, plating baths to which diamond particles having different average particle sizes (10, 25, 45, 195, 230 μm) were added were respectively prepared and used.
The plating solution was used by mixing and stirring the amount of diamond particles in Table 1 in 100 mL of the plating solution using a 100 mL beaker, and then pouring into a plating tank. The addition amount of the diamond particles used in the examples corresponds to the amount of stacking two layers of the diamond particles at a filling rate of 64% on the bottom surface (bottom area: 3.5 cm × 7 cm) of the plating tank.

図3にめっき液に加えたダイヤモンド粒子(粒径:10、25、45、195、230μm)のSEM像を示す。ダイヤモンド粒子は比較的大きなダイヤモンド粒子を破砕して分粒したものである。粒径が195μm、230μmのものは角がとれた形態で球体に近い形状となっている。   The SEM image of the diamond particle (particle size: 10, 25, 45, 195, 230 micrometers) added to the plating solution in FIG. 3 is shown. Diamond particles are obtained by crushing and classifying relatively large diamond particles. The particles with a particle diameter of 195 μm and 230 μm have a shape close to a sphere in the form of an angle.

(めっき条件)
A. 電位規制法
陰極電位 −0.2V (vs.SCE)
陰極 純銅(めっき面積15cm2
陽極 含リン銅
浴温 25℃
めっき厚 1mm
B. 電流規制法
電流値 0.075A
陰極 純銅(めっき面積15cm2
陽極 含リン銅
浴温 25℃
めっき厚 1mm
(Plating conditions)
A. Potential regulation method Cathodic potential-0.2 V (vs. SCE)
Cathode pure copper (plating area 15 cm 2 )
Anodic phosphorus-containing copper bath temperature 25 ° C
Plating thickness 1 mm
B. Current regulation method Current value 0.075A
Cathode pure copper (plating area 15 cm 2 )
Anodic phosphorus-containing copper bath temperature 25 ° C
Plating thickness 1 mm

なお、電位規制法により陰極から水素を発生させないようにするには、水素を発生させない基準電極として定められているSHE(Standard Hydrogen Electrode)に対し、陰極を正側の電位に設定する必要がある。
SCEとSHEとは、SCE=0.2412V vs SHEという関係にあるから、上記の陰極電位−0.2V(vs.SCE)という設定条件、すなわち、陰極電位をSCEに対して−0.2Vに設定しためっき条件は、陰極電位を、SHEに対し+0.0412Vとしたこと、すなわちSHEに対し正側に設定し、陰極で水素が発生しない条件としたことを意味する。
In order to prevent generation of hydrogen from the cathode by the potential regulation method, it is necessary to set the cathode to a potential on the positive side with respect to a standard hydrogen electrode (SHE) defined as a reference electrode not generating hydrogen. .
Since SCE and SHE are in a relationship of SCE = 0.2412 V vs SHE, the plating condition in which the cathode potential is set to -0.2 V (vs. SCE), that is, the cathode potential is set to-0.2 V with respect to SCE The conditions mean that the cathode potential is set to +0.0412 V with respect to SHE, that is, it is set to a positive side with respect to SHE and no hydrogen is generated at the cathode.

(めっき操作)
電位規制法により銅−ダイヤモンド複合材料を作製する場合は、図1に示すように、鉛直方向の上下位置に陽極12と陰極14とを配置し、めっき槽10にダイヤモンド粒子を懸濁しためっき液を入れ、まず、めっき液を攪拌してめっき液中でダイヤモンド粒子を均一に分散させた後、めっき液の攪拌を停止し、陽極12と陰極とを電源に接続し、陰極14の電位を−0.2V(vs.SCE)とするめっき条件を保持しながら、陽極12と陰極14とに電流を通じてめっきした。電位規制法によるめっきでは、陰極電位を所定電位に設定してめっきするため、実際には、陽極12と陰極14の他に、基準電位となる電極をめっき槽に設置してめっきする。
(Plating operation)
In the case of producing a copper-diamond composite material by the potential control method, as shown in FIG. 1, a plating solution in which the anode 12 and the cathode 14 are disposed at upper and lower positions in the vertical direction and diamond particles are suspended in the plating tank 10 After stirring the plating solution to disperse the diamond particles uniformly in the plating solution, the stirring of the plating solution is stopped, the anode 12 and the cathode are connected to a power supply, and the potential of the cathode 14 is The anode 12 and the cathode 14 were plated through a current while maintaining the plating conditions of 0.2 V (vs. SCE). In the plating according to the potential control method, in order to set the cathode potential to a predetermined potential and perform plating, in addition to the anode 12 and the cathode 14, an electrode to be a reference potential is set and plated in a plating tank.

表2に、電位規制法により陰極14上に銅−ダイヤモンド複合材料を形成した実験でのめっき厚と通電量を示す。なお、電位規制法では、めっき厚を通電量(電流[A]×時間[s])によって制御する、したがって、めっき時間は定まらない。
Table 2 shows the plating thickness and the amount of electricity in an experiment in which a copper-diamond composite material was formed on the cathode 14 by the potential control method. In the potential regulation method, the plating thickness is controlled by the amount of current (current [A] × time [s]), and therefore the plating time is not determined.

表3に、上記実験における電流効率と、得られた複合材料に含まれるダイヤモンド粒子の含有率(体積%)を示す。電流効率は、次式により求めた。電流効率=(得られためっき膜の膜厚/理論膜厚)×100%
Table 3 shows the current efficiency in the above experiment and the content (volume%) of the diamond particles contained in the obtained composite material. The current efficiency was determined by the following equation. Current efficiency = (film thickness of obtained plating film / theoretical film thickness) × 100%

図4は、上述した電位規制法により得られた銅−ダイヤモンド複合材料の表面のSEM像である。SEM像に、銅−ダイヤモンド複合材料中に含有されたダイヤモンド粒子の形態が見えている。また、ダイヤモンド粒子の間に銅が充填され、ダイヤモンド粒子と銅が複合化された材料となっていることがわかる。   FIG. 4 is a SEM image of the surface of the copper-diamond composite material obtained by the above-described potential regulation method. The SEM image shows the morphology of the diamond particles contained in the copper-diamond composite. Moreover, it turns out that copper is filled between the diamond particles, and the material is a composite of the diamond particles and copper.

電流規制法によりめっきする場合は、電位規制法による場合と同様に、めっき槽10にダイヤモンド粒子を混合しためっき液を入れ、めっき液を攪拌してめっき液中でダイヤモンド粒子を均一に分散させた後、めっき液の攪拌を停止し、陽極12と陰極とを電源に接続し、電流値を0.075Aとしてめっきした。
表4に電流規制法により銅−ダイヤモンド複合材料を作製した場合のめっき厚とめっき時間を示す。
In the case of plating by the current regulation method, as in the case of the potential regulation method, the plating solution containing diamond particles was added to the plating tank 10, and the plating solution was stirred to uniformly disperse the diamond particles in the plating solution. Thereafter, the stirring of the plating solution was stopped, and the anode 12 and the cathode were connected to a power supply, and plating was performed with a current value of 0.075A.
Table 4 shows the plating thickness and plating time when a copper-diamond composite material is manufactured by the current control method.

表5に、上記表4に示す銅−ダイヤモンド複合材料を得たときの電流効率と、複合材料に含まれるダイヤモンド粒子の含有率(体積%)を示す。電流効率は、電流規制法による場合と同様に求めた。
Table 5 shows the current efficiency when the copper-diamond composite material shown in Table 4 is obtained, and the content (volume%) of diamond particles contained in the composite material. The current efficiency was determined as in the case of the current regulation method.

表3の電位規制法による場合と、表5の電流規制法によるめっき結果を比較すると、電位規制法によるめっきでは、電流効率が略100%に近く、電流規制法によるめっきと比較して、電流効率の点で大幅に改善されることがわかる。電流規制法による場合に電流効率が劣化する原因は、めっきの際に水素が発生するためである。電位規制法による場合は、陰極電位を水素が発生しない電位に設定しているから、原理的にも電流効率は100%となる。電位規制法による実験結果は、めっき時にほとんど水素が発生していないことを裏付けている。   Comparing the plating results by the potential regulation method in Table 3 with the plating results by the current regulation method in Table 5, in the plating by the potential regulation method, the current efficiency is nearly 100%, and compared to the plating by the current regulation method, the current It can be seen that there is a significant improvement in efficiency. The reason why the current efficiency is degraded when the current regulation method is used is that hydrogen is generated during plating. In the case of the potential regulation method, since the cathode potential is set to a potential at which hydrogen is not generated, the current efficiency is also 100% in principle. The experimental results by the potential control method support that almost no hydrogen is generated at the time of plating.

図5は、上述した電流規制法により得られた銅−ダイヤモンド複合材料の表面のSEM像である。この銅−ダイヤモンド複合材料のSEM像にも、複合材料中に含有されたダイヤモンド粒子の形態が見えている。図4に示した電位規制法による銅−ダイヤモンド複合材料と比較すると、ダイヤモンド粒子間を充填する銅の緻密性が若干、劣るように見える。   FIG. 5 is a SEM image of the surface of the copper-diamond composite material obtained by the current control method described above. The SEM image of this copper-diamond composite also shows the morphology of the diamond particles contained in the composite. When compared with the potential control method copper-diamond composite material shown in FIG. 4, the compactness of the copper filling between the diamond particles seems to be slightly inferior.

図6は、電流規制法により銅−ダイヤモンド複合材料を作製した場合に、めっき中に水素が発生することを実験的に検知した例を示す。この実験は、ダイヤモンド粒子の粒径を10μm、電流密度を0.5Adm-2とし、めっき時間(経過時間)による陰極の電位の変化を調べたものである。陽極と陰極の配置等は上述した実験における配置と同一である。   FIG. 6 shows an example in which the generation of hydrogen during plating is detected experimentally when a copper-diamond composite material is manufactured by the current control method. In this experiment, the diameter of the diamond particles was 10 μm, the current density was 0.5 Adm −2, and changes in the potential of the cathode with the plating time (elapsed time) were examined. The arrangement and the like of the anode and the cathode are the same as the arrangement in the above-mentioned experiment.

図6の縦軸は、電極SCEに対する陰極の電位を示す。
図6に示す測定結果は、めっき開始から30分程度経過したところで、陰極の電位が急激にマイナス側に変化したことを示す。実験では、この陰極電位が急激にマイナス側に変化した時点で水素ガスの発生を検知した。
すなわち、電流規制法によるめっきにおいては、水素発生を抑制することができる電位よりも陰極電位がマイナス側になると水素が発生することを示す。図6は、また、電極SCEに対して陰極が-2Vよりもプラス側であれば、めっき中に水素が発生しないことも示している。
The vertical axis in FIG. 6 shows the potential of the cathode relative to the electrode SCE.
The measurement result shown in FIG. 6 indicates that the potential of the cathode rapidly changed to the negative side about 30 minutes after the start of plating. In the experiment, the generation of hydrogen gas was detected when the cathode potential rapidly changed to the negative side.
That is, in the plating according to the current regulation method, hydrogen is generated when the cathode potential is on the minus side of the potential at which hydrogen generation can be suppressed. FIG. 6 also shows that no hydrogen is generated during plating if the cathode is more positive than -2 V with respect to the electrode SCE.

(熱伝導率試験)
図7は、電位規制法により作製した上記の銅−ダイヤモンド複合材料のサンプルについて熱伝導率を測定した結果、図8は、電流規制法により作製した銅−ダイヤモンド複合材料のサンプルについて熱伝導率を測定した結果を示す。図7、8では、複合材の熱伝導率を示す理論式(Hasselman-Johnson)と実測値とを合わせて示した。また、純銅についての値を示した。
ハッセルマン−ジョンソンの理論式は次式で与えられる。
(Thermal conductivity test)
FIG. 7 shows the result of measuring the thermal conductivity of the sample of the above-mentioned copper-diamond composite material manufactured by the potential control method, and FIG. 8 shows the thermal conductivity of the sample of the copper-diamond composite material manufactured by the current control method. The measured results are shown. In FIGS. 7 and 8, the theoretical formula (Hasselman-Johnson) indicating the thermal conductivity of the composite and the measured value are shown. Also, the values for pure copper are shown.
The Hasselman-Johnson theoretical equation is given by:

上式で、k:銅−ダイヤモンド複合材の熱伝導率(W/mK)、k:銅の熱伝導率(W/mK)、k:ダイヤモンドの熱伝導率(W/mK)、V:ダイヤモンド粒子の体積分率、α:ダイヤモンド粒子の半径(m)、h:ダイヤモンドと銅との界面熱伝達率(W/m2K)である。k=398、k=900、h=88577882.1である。 In the above equation, k: thermal conductivity of copper-diamond composite (W / mK), k m : thermal conductivity of copper (W / mK), k d : thermal conductivity of diamond (W / mK), V d : volume fraction of diamond particles, α: radius of diamond particles (m), h c : interface heat transfer coefficient between diamond and copper (W / m 2 K). k m = 398, k d = 900, h c = 88577882.1.

熱伝導率の測定はJIS R 1611に記載されたフラッシュ法に準拠し、キセノンフラッシュ熱特性評価装置(ブルカー・エイエックスエス株式会社製、製品名LFA 447 Nanoflash)を用いて、陰極から剥離した銅−ダイヤモンド複合材料について熱拡散率を測定することで行った。
熱伝導率は、λ=α×c×ρに従って求めた。λ:銅−ダイヤモンド複合材料の熱伝導率(W/mK)、α:銅−ダイヤモンド複合材料の熱拡散率(m2/s)、c:銅−ダイヤモンド複合材料の比熱容量(J/kg・K)、ρ:銅−ダイヤモンド複合材料のかさ密度(kg/m3)である。なお、銅−ダイヤモンド複合材の比熱容量cは、銅の比熱容量CCuを0.386kJ/kg・K、ダイヤモンドの比熱容量Cを0.53kJ/kg・Kとし、c=CCuCu+Cによって算出され、銅−ダイヤモンド複合材料のかさ密度ρは、ρ=ρCuCu+ρによって算出される。なお、VCuは銅−ダイヤモンド複合材料中の銅の体積分率、Vはダイヤモンドの体積分率、ρCuは銅のかさ密度、ρはダイヤモンドのかさ密度である。
The measurement of the thermal conductivity is based on the flash method described in JIS R 1611, and copper peeled from the cathode using a xenon flash thermal property evaluation device (manufactured by Bruker AXS Co., Ltd., product name LFA 447 Nanoflash) Conducted by measuring the thermal diffusivity of the diamond composite material.
The thermal conductivity was determined according to λ = α × c × ρ. λ: thermal conductivity of copper-diamond composite (W / mK), α: thermal diffusivity of copper-diamond composite (m 2 / s), c: specific heat capacity of copper-diamond composite (J / kg ··· K), ρ: bulk density (kg / m 3 ) of copper-diamond composite material. Incidentally, copper - specific heat capacity c of the diamond composite material, the specific heat capacity C Cu of copper 0.386kJ / kg · K, the specific heat capacity C d of diamond and 0.53kJ / kg · K, c = C Cu V Cu + C d Calculated by V d , the bulk density 銅 of the copper-diamond composite is calculated by ρ = ρ Cu V Cu + ρ d V d . V Cu is a volume fraction of copper in the copper-diamond composite, V d is a volume fraction of diamond, Cu Cu is a bulk density of copper, and d d is a bulk density of diamond.

図7、8に示す銅−ダイヤモンド複合材料の熱伝導率の測定結果は、銅とダイヤモンド粒子とを複合化することにより、銅の熱伝導率を上回る熱伝導率が得られること、とくに粒径45μm以上のダイヤモンド粒子を使用することにより、銅−ダイヤモンド複合材料の熱伝導率が銅の熱伝導率を大きく上回ることを示している。
また、電位規制法による場合(図7)と電流規制法(図8)による場合とを比較すると、電位規制法による複合材料は、電流規制法によるものよりも理論式に近い値が得られていることがわかる。すなわち、電位規制法を利用してめっきすることにより、めっき中に水素が発生させずにめっきすることができ、隣り合ったダイヤモンド粒子の間が緻密に銅(めっき銅)によって充填され、複合材料中にボイドが残留せずにめっきされることで、より理論式に近い値が得られたものと考えられる。
The measurement results of the thermal conductivity of the copper-diamond composite shown in FIGS. 7 and 8 show that the thermal conductivity exceeding that of copper can be obtained by compounding copper and diamond particles, in particular, the particle diameter By using diamond particles of 45 μm or more, it is shown that the thermal conductivity of the copper-diamond composite greatly exceeds that of copper.
Also, comparing the case of the potential regulation method (FIG. 7) with that of the current regulation method (FIG. 8), the composite material by the potential regulation method has a value closer to the theoretical formula than that by the current regulation method. I understand that That is, by plating using a potential control method, it is possible to plate without generating hydrogen during plating, and the space between adjacent diamond particles is densely filled with copper (plated copper), and the composite material It is considered that the value closer to the theoretical formula was obtained by plating without residual voids.

上述した実験結果は、めっき方法を利用して銅−ダイヤモンド複合材料を作製する際に電位規制法がダイヤモンド粒子間を銅によって確実に充填しながら複合材料を形成する上できわめて有効であることを示す。とくに、陰極上にダイヤモンド粒子を徐々に沈降させて堆積させながらめっきする際には、ダイヤモンド粒子が複合材料中に入り込むことにより、めっきが析出する面積が刻々と変化すること、めっき中に水素が発生するとダイヤモンド粒子を浮き上がらせるように作用し、めっき中にボイドが発生しやすくなるという問題に対して、電位規制法によるめっき方法はきわめて有効である。電位規制法は、めっきを析出させる面積が変動しても、電極電位を規制するのみでめっきするから、めっき面積の変動にはなんら左右されないからである。また、めっき中に水素を発生させないことから、水素によってダイヤモンド粒子が浮き上がるといったこともない。   The experimental results described above indicate that the potential control method is extremely effective in forming a composite material while reliably filling the space between the diamond particles with copper when producing a copper-diamond composite material using a plating method. Show. In particular, when plating while gradually settling and depositing diamond particles on the cathode, the area in which the plating is deposited changes momentarily due to the penetration of the diamond particles into the composite material, and hydrogen is generated during plating. The action of plating by the potential control method is extremely effective for the problem that when it occurs, it acts to lift up the diamond particles, and voids are easily generated during plating. In the potential regulation method, even if the area where the plating is deposited changes, plating is performed only by regulating the electrode potential, and therefore, it is not influenced by the variation of the plating area. In addition, since hydrogen is not generated during plating, the diamond particles are not lifted up by hydrogen.

なお、上記実施例では、銅−ダイヤモンド複合材料をめっきにより作製する例について説明したが、本発明方法は銅−ダイヤモンド複合材料に限らず、ニッケル−ダイヤモンド複合材料のような銅以外のめっき金属との組み合わせについても適用することができる。
本発明においては、電位規制法を利用して、めっき中に水素を発生させずにめっきするから、めっき条件としては、水素の還元電位(0V vs.SHE=−0.2412V vs. SCE)よりも正側の電位で析出可能な金属であればめっきすることができる。たとえば、硫酸銅浴からの銅の析出電位は+0.06V vs. SCEであり水素の発生を抑えるめっきが可能である。これに対し、たとえば、無光沢ワット浴からのニッケルの析出電位は−0.8V vs. SCEであり、電位規制法を用いても水素の発生を抑えてめっきすることができない。このように、本発明方法を適用する場合は、めっき浴や使用する電極材料を適宜選択して適用する必要がある。
In the above embodiment, although the example of producing the copper-diamond composite material by plating has been described, the method of the present invention is not limited to the copper-diamond composite material, and a plating metal other than copper such as nickel-diamond composite material The same applies to combinations of
In the present invention, since plating is performed without generating hydrogen during plating using the potential control method, as a plating condition, the reduction potential of hydrogen (0 V vs. SHE = −0.2412 V vs. SCE) is used. Any metal that can be deposited at the positive potential can be plated. For example, the deposition potential of copper from a copper sulfate bath is +0.06 V vs. SCE, and plating that suppresses the generation of hydrogen is possible. On the other hand, for example, the deposition potential of nickel from a matte wattage bath is -0.8 V vs. SCE, and even if the potential regulation method is used, plating can not be performed while suppressing the generation of hydrogen. As described above, when the method of the present invention is applied, it is necessary to appropriately select and apply a plating bath and an electrode material to be used.

また、上記実施例ではマトリックス金属に含有する分散粒子としてダイヤモンド粒子を使用する例について説明したが、マトリックス金属に含有させる分散粒子として、ダイヤモンド粒子以外の、シリカ、カーボン繊維、カーボンナノチューブ等の無機物や、樹脂粒子等の有機物を対象とすることができる。   In the above embodiments, diamond particles are used as the dispersed particles contained in the matrix metal. However, as dispersed particles contained in the matrix metal, inorganic substances such as silica, carbon fibers, carbon nanotubes and the like other than diamond particles and And organic substances such as resin particles.

10 めっき槽
12 陽極
14 陰極
14a 折曲片
14b 延出片
14c マスキングテープ
20 分散粒子
22 めっき金属


DESCRIPTION OF SYMBOLS 10 plating tank 12 anode 14 cathode 14a bending piece 14b extending piece 14c masking tape 20 dispersion particle 22 plating metal


Claims (3)

めっき槽内の鉛直方向の上位置に陽極、下位置に陰極を、電極面の向きを水平方向として互いに対向させて配置し、
めっき液中に分散させた分散粒子を前記陰極に向け徐々に沈降させ、陰極上に堆積させるとともに、陰極上にめっき金属を析出させることにより、めっきマトリックス中に前記分散粒子が含まれためっき複合材料を作製する方法であって、
前記分散粒子がダイヤモンド粒子であり、
前記陰極上にめっきを析出させる際に、電位規制法により前記陰極の電位を水素が発生しない電位に設定し、水素の還元電位よりも正側の電位で析出可能なめっきを施すことを特徴とするめっき複合材料の製造方法。
Place the anode at the upper position in the vertical direction in the plating tank and the cathode at the lower position with the electrode faces facing horizontally, facing each other,
The plated composite in which the dispersed particles are contained in the plating matrix by gradually dispersing the dispersed particles dispersed in the plating solution toward the cathode and depositing them on the cathode and depositing the plating metal on the cathode. A method of making the material,
The dispersed particles are diamond particles,
When the plating is deposited on the cathode, the potential of the cathode is set to a potential at which hydrogen is not generated by a potential control method, and plating capable of depositing at a potential more positive than the reduction potential of hydrogen is performed. Method of producing a plated composite material.
前記めっきとして、銅めっきを施すことを特徴とする請求項記載のめっき複合材料の製造方法。 As the plating method of plating a composite material according to claim 1, wherein the copper plating is performed. 前記ダイヤモンド粒子として、粒径45μm以上の粒子を使用することを特徴とする請求項1または2記載のめっき複合材料の製造方法。 The method according to claim 1 or 2 , wherein particles having a particle diameter of 45 μm or more are used as the diamond particles.
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