201022618 >0twf.odc/e 六、發明說明： 【發明所屬之技術領域】 本發明是有關於-種複合材料及其製造方法，且特別 是有關於一種具纖維方向排列之金屬基複材薄片及其製 法0 八 【先前技術】201022618 >0twf.odc/e VI. Description of the Invention: [Technical Field] The present invention relates to a composite material and a method of manufacturing the same, and more particularly to a metal-based composite sheet having fiber orientation And its method 0 eight [previous technology]
隨著電子產品之設計趨勢走向輕薄短小，電子元件之 散熱需求也絲愈重要。散熱元件分為絲式散熱元件及 被動式散熱元件。主動^散熱元件例如是風扇、水冷循環 等。被動式散熱元件例如是導熱性佳的金屬製作而成之散 熱片。 月 、為了加強散熱片的散熱效率，除了將散熱片以溝槽化 方式設計明加散熱面積外’也可以在發熱元件 之間塗佈散熱膏。一般常用的散熱膏為銀膠。、…、 然而，因為銀膠無方向性，且銀粒子間為膠料隔 阻擋熱傳遞’導熱錄只有約3_6W/m《，無法充分 導熱之效果。 ^ —因此’如何製作導熱性佳且導針向—致之金屬 材薄片，已成為業者亟為重視的議題之—。 土 【發明内容】 有鑑於此’本發明提供—種具纖維方向制之 複材薄片，其具有與金屬基材垂直配置轉誠維，，因二 201022618 juw^Otwf.odc/e 導熱性佳且導熱方向一致。 本發明另提供一種具纖維方向排列之金屬基複材薄 片的製造方法，其製程簡單，且製造出的金屬基複材薄片 之導熱係數可高至l〇〇〇W/m-K。 本發明提供一種具纖維方向排列之金屬基複材薄 片’其包括金屬基材及數個導熱纖維’其中金屬基材具有 一厚度。而導熱纖維則是配置於金屬基材中並沿著金屬基 材的厚度方向排列。 在本發明之一實施例中’上述之導熱纖維包括碳纖 維。 在本發明之一實施例中’上述之金屬基材包括銅、 銀、鎳、鈷或其合金。 在本發明之一實施例中，上述之厚度例如是在約 至500μιη之間。 在本發明之一實施例中，上述之各導熱纖維之兩端更 包括突出於金屬基材的表面。 在本發明之一實施例中，上述之各導熱纖維之一端可 突出於金屬基材的表面，另一端可包覆於該金屬基材中。 本發明另提供一種具纖維方向排列之金屬基複材薄 片的製造方法。首先，利用靜電植毛方式（electr〇static flocking)，將數個導熱纖維直立固定於樹脂上。接著，於 導熱纖維表面形成金屬基材。然後，清除樹脂，以形成金 屬基複材薄片。 在本發明之一實施例中，於上述之導熱纖維表面形成 201022618 j 〜^w90twf.odc/e 金屬基材的方法包括蒸鍍或化學氣相沉積製程。 在本發明之一實施例中’上述之導熱纖維包括碳纖 維。 在本發明之一實施例中，上述之金屬基材包括銅、 銀、鎳、鈷或其合金。 在本發明之一實施例中，上述之金屬基材的厚度例如 是在約Ιμπι至500μιη之間。 土、过· ，本發明之具纖維方向排列之金.屬基複材薄 片為結合導熱纖維之金屬基材，因此整體片材之導熱係數 可以大幅提升’可局至l〇〇〇W/m-K。此外，本發明之金屬 基複材薄片導熱性佳，可以沿著導熱纖維之方向連續導 熱’充分發揮導熱的效果。 、 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉實施例’並配合所附圖式作詳細說明如下。 I 【實施方式】 圖ία至ic為依據本發明一實施例所纟會示的一種具纖 維方向排列之金屬基複材薄片的製造流程之剖面示意圖。 圖1D為依據本發明另一實施例所繪示的一種具纖維方向 排列之金屬基複材薄片之剖面示意圖。 首先》月參照圖1A ’利用靜電植毛方式（eiectrostatic flocking)，將數個導熱纖維1〇2直立固定於樹脂1〇〇上。 巧脂100例如是高分子樹脂。導熱纖維102例如是碳纖維。 靜電植毛方式是將樹脂1〇〇置於靜電磁場範圍内，導熱纖 y〇twf.〇dc/e 201022618 維102 M靜電磁場作用而飛黏於樹脂1〇〇上 取 理而形成之。 丹、、，工乾無處 接著，請參照圖1B，於導熱纖維102 基材104。金屬基材⑽包括銅m或其^屬 且其形成方法包括蒸鍍或化學氣相沉積製程。在此步驟 中，金屬基材104逐漸填滿導熱纖維102之間的空隙中， 也可以視製程需要選擇性地覆蓋導熱纖維1〇2的頂部。金 φ 屬基材104的厚度d例如是在約Ιμπι至500μιη之間。 —然後，請參照圖1c，清除樹脂1〇〇，以形成金屬基複 材薄片106。金屬基複材薄片包括金屬基材1〇4及導 熱纖維102。導熱纖維1〇2配置於金屬基材1〇4中並沿著 金屬基材104的厚度方向排列。在一實施例中，各導熱纖 維102可以一端包覆於金屬基材1〇4中，另一端突出 屬基材ΚΗ表面，如圖1C所示。在另—實施^出3 熱纖維102之兩端也可以都突出於金屬基材1〇4的表面， 如圖1D所示。 0 综上所述，本發明之具纖維方向排列之金屬基複材薄 片由於具有沿著金屬基材之厚度方向排列的導熱纖維因 此導熱方向一致，可沿著導熱纖維之排列方向連續導熱。 另外，本發明之金屬基複材薄片之界面導熱性佳，導熱係 數可高至1000W/m-K。 ' 此外’習知複雜的技術如熔融滲透（inflltrati〇n)、粉 末冶金（powder metallurgy)或流鑄（rhe〇casting)等等， 由於不易製成薄片，且導熱纖維不易排列成直立於金屬基 201022618 --yUtwf.〇dc/e 材中’因此其導熱效果有限。相較下’本發明之金屬基複 材薄片的製造方法簡單’僅藉由樹脂及靜電植毛方式即可 製作導熱方向一致之金屬基複材薄片，因此可大幅降低成 本’提升競爭力。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明，任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内’當可作些許之更動與潤飾’故本 φ 發明之保護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1A至1C為依據本發明一實施例所緣示的一種具纖 維方向排列之金屬基複材薄片的製造流程之剖面示意圖。 圖1D為依據本發明另一實施例所繪示的/種具纖維 方向排列之金屬基複材薄片之剖面示意圖。 【主要元件符號說明】 _ 100 :樹脂 102 :導熱纖維 104 :金屬基材 i〇6:具纖維方向排列之金屬基複材薄片 d :厚度 7As the design trend of electronic products is light and thin, the heat dissipation requirements of electronic components are also becoming more important. The heat dissipating component is divided into a wire heat dissipating component and a passive heat dissipating component. The active heat dissipating component is, for example, a fan, a water cooling cycle, or the like. The passive heat dissipating member is, for example, a heat radiating sheet made of a metal having good thermal conductivity. In order to enhance the heat dissipation efficiency of the heat sink, it is also possible to apply a heat-dissipating paste between the heat-generating elements in addition to the heat-dissipating fins in a grooved manner. The commonly used thermal grease is silver glue. However, because silver glue has no directionality, and the silver particles block the heat transfer between the rubber particles, the heat transfer recording is only about 3_6 W/m, and the effect of heat conduction is not sufficient. ^ — Therefore, how to make a thin sheet of metal with good thermal conductivity and a guide pin has become an issue that the industry has paid attention to. [Invention] In view of the above, the present invention provides a composite material sheet having a fiber direction, which has a vertical configuration with a metal substrate, and has a thermal conductivity of 201022618 juw^Otwf.odc/e. The heat conduction direction is the same. The present invention further provides a method for producing a metal-based composite sheet having a fiber direction alignment, which is simple in process and can produce a metal-based composite sheet having a thermal conductivity as high as l〇〇〇W/m-K. The present invention provides a metal-based composite sheet having a fiber direction alignment, which comprises a metal substrate and a plurality of thermally conductive fibers, wherein the metal substrate has a thickness. The thermally conductive fibers are disposed in the metal substrate and arranged along the thickness direction of the metal substrate. In an embodiment of the invention, the above thermally conductive fiber comprises carbon fiber. In one embodiment of the invention, the metal substrate described above comprises copper, silver, nickel, cobalt or alloys thereof. In an embodiment of the invention, the thickness is, for example, between about 500 μm. In an embodiment of the invention, the two ends of each of the heat conducting fibers further comprise a surface protruding from the metal substrate. In an embodiment of the invention, one end of each of the heat conducting fibers may protrude from a surface of the metal substrate, and the other end may be coated in the metal substrate. The present invention further provides a method of producing a metal-based composite sheet having fiber orientation. First, a plurality of thermally conductive fibers are erected and fixed to the resin by means of electrostatic cracking (electr〇static flocking). Next, a metal substrate is formed on the surface of the thermally conductive fiber. Then, the resin is removed to form a metal-based composite sheet. In one embodiment of the invention, the method of forming a 201022618 j~^w90twf.odc/e metal substrate on the surface of the thermally conductive fiber comprises an evaporation or chemical vapor deposition process. In an embodiment of the invention, the above thermally conductive fiber comprises carbon fiber. In an embodiment of the invention, the metal substrate comprises copper, silver, nickel, cobalt or an alloy thereof. In an embodiment of the invention, the thickness of the metal substrate is, for example, between about Ιμπι and 500 μm. Earth, over, the fiber-oriented composite sheet of the present invention is a metal substrate combined with heat-conducting fibers, so the thermal conductivity of the overall sheet can be greatly improved 'can be reduced to l〇〇〇W/mK . Further, the metal-based composite sheet of the present invention has excellent thermal conductivity and can continuously conduct heat in the direction of the heat-conductive fibers to sufficiently exhibit the effect of heat conduction. The above described features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Figs. ία to ic are schematic cross-sectional views showing a manufacturing process of a metal-based composite sheet having fibers arranged in accordance with an embodiment of the present invention. 1D is a schematic cross-sectional view of a metal-based composite sheet having fiber orientations according to another embodiment of the invention. First, a plurality of heat-conductive fibers 1〇2 are erected and fixed to the resin 1〇〇 by means of eiectrostatic flocking with reference to Fig. 1A. The polyester 100 is, for example, a polymer resin. The thermally conductive fiber 102 is, for example, carbon fiber. The electrostatic flocking method is formed by placing the resin 1〇〇 in the range of the electrostatic magnetic field and the heat-conducting fiber y〇twf.〇dc/e 201022618 dimension 102 M electrostatic magnetic field and flying on the resin 1〇〇. Dan, ,, work nowhere Next, please refer to Figure 1B, on the thermal conductive fiber 102 substrate 104. The metal substrate (10) includes copper m or its genus and its formation method includes an evaporation or chemical vapor deposition process. In this step, the metal substrate 104 is gradually filled in the space between the heat conductive fibers 102, and the top of the heat conductive fibers 1〇2 may be selectively covered depending on the process. The thickness d of the gold φ substrate 104 is, for example, between about Ιμπι and 500 μmη. - Then, referring to Fig. 1c, the resin 1 is removed to form a metal-based composite sheet 106. The metal-based composite sheet includes a metal substrate 1〇4 and a heat conductive fiber 102. The heat conductive fibers 1〇2 are disposed in the metal base material 1〇4 and arranged along the thickness direction of the metal base material 104. In one embodiment, each of the thermally conductive fibers 102 may be coated at one end with a metal substrate 1〇4 and at the other end protruding from the surface of the substrate, as shown in Figure 1C. Both ends of the heat-generating fiber 102 may also protrude from the surface of the metal substrate 1〇4 as shown in Fig. 1D. In summary, the metal-based composite sheet having the fiber direction alignment of the present invention has a heat conduction direction which is aligned along the thickness direction of the metal substrate, so that the heat conduction direction is uniform, and the heat conduction can be continuously conducted along the direction in which the heat conductive fibers are arranged. Further, the metal-based composite sheet of the present invention has excellent thermal conductivity at the interface, and the thermal conductivity can be as high as 1000 W/m-K. 'In addition' conventional techniques such as melt infiltration, powder metallurgy or rheocasting, etc., are not easily formed into flakes, and the thermally conductive fibers are not easily aligned to stand upright on the metal base. 201022618 --yUtwf.〇dc/e in the material 'so its thermal conductivity is limited. Compared with the following, the method for producing a metal-based composite sheet of the present invention is simple, and a metal-based composite sheet having a uniform heat conduction direction can be produced only by a resin and an electrostatic flocking method, so that the cost can be greatly reduced. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make a few changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of this invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figs. 1A to 1C are schematic cross-sectional views showing a manufacturing process of a metal-based composite sheet having fiber direction alignment according to an embodiment of the present invention. 1D is a cross-sectional view showing a metal-based composite sheet having a fiber direction alignment according to another embodiment of the present invention. [Main component symbol description] _ 100 : Resin 102 : Thermal conductive fiber 104 : Metal substrate i〇6: Metal-based composite sheet with fiber orientation d : Thickness 7