JP4422068B2 - Graphite sheet - Google Patents

Graphite sheet Download PDF

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Publication number
JP4422068B2
JP4422068B2 JP2005153486A JP2005153486A JP4422068B2 JP 4422068 B2 JP4422068 B2 JP 4422068B2 JP 2005153486 A JP2005153486 A JP 2005153486A JP 2005153486 A JP2005153486 A JP 2005153486A JP 4422068 B2 JP4422068 B2 JP 4422068B2
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Japan
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graphite sheet
ceramic substrate
heat
metal oxide
oxide layer
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JP2006332308A (en
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典裕 河村
和彦 久保
英文 佐々木
実 大内
正志 船場
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

本発明は、セラミクス基板に設けられるグラファイトシート関する。 The present invention relates to a graphite sheet provided on the ceramic substrate.

近年、携帯電話の電子機器にみられるように小型高機能化が進められ、このような電子機器を構成する各種電子部品においては、関連する電子部品の複合化が進められている。   In recent years, as seen in mobile phone electronic devices, miniaturization and higher functionality have been promoted, and in various electronic components constituting such electronic devices, related electronic components have been combined.

そして、このような電子部品の複合化においては、特にセラミクス基板の内層に適宜内部電極を設け高周波スイッチなどの電子回路を形成した機能性セラミクス部品に対して、高周波増幅器などの発熱部品を複合化する形態などが増えてきている。   And in the compounding of such electronic parts, heat generating parts such as high-frequency amplifiers are compounded with functional ceramic parts in which electronic circuits such as high-frequency switches are formed by providing appropriate internal electrodes on the inner layer of the ceramic substrate. The form to do is increasing.

そして、機能性セラミクス部品を形成するセラミクス基板上に発熱部品を実装する場合、セラミクス基板が発熱部品のヒートシンクとなることから、発熱部品に生じる熱を効率よくセラミクス基板内に分散させる必要が生じることから、従来、セラミクス基板は発熱部品が実装される上面にグラファイトシートを貼り付けていた。   When mounting a heat-generating component on a ceramic substrate that forms a functional ceramic component, the ceramic substrate serves as a heat sink for the heat-generating component, so it is necessary to efficiently dissipate the heat generated in the heat-generating component within the ceramic substrate. Therefore, conventionally, a ceramic substrate has a graphite sheet attached to the upper surface on which a heat generating component is mounted.

なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献1が知られている。
特開2003−174204号公報
For example, Patent Document 1 is known as prior art document information related to the invention of this application.
JP 2003-174204 A

しかしながら、グラファイトシートをセラミクス基板に貼り付ける際に接着剤を使用するため、発熱部品からセラミクス基板に至る熱伝達経路に樹脂接着層が介在することになり十分な熱伝達効果を得ることが困難なものとなっていた。   However, since an adhesive is used when the graphite sheet is attached to the ceramic substrate, a resin adhesive layer is interposed in the heat transfer path from the heat generating component to the ceramic substrate, and it is difficult to obtain a sufficient heat transfer effect. It was a thing.

そこで、本発明はこのような問題を解決しセラミクス基板に対するグラファイトシートからの熱伝導性を向上させることを目的とする。   Accordingly, the present invention aims to solve such problems and improve the thermal conductivity from the graphite sheet to the ceramic substrate.

そして、この目的を達成するために本発明は、特に微細構造が層状のグラファイトシートとセラミクス基板上面の間に酸化金属層を設け、前記セラミクス基板と前記酸化金属層とを焼成により結合し一体化した構成としたのである。 In order to achieve this object, the present invention particularly provides a metal oxide layer between the graphite sheet having a layered microstructure and the upper surface of the ceramic substrate, and the ceramic substrate and the metal oxide layer are bonded and integrated by firing. This is the configuration.

この構成によれば、グラファイトシートがセラミクス基板に対して酸化金属層を介して一体化されるためグラファイトシートにおけるセラミクス基板への熱伝導性を高められるのである。   According to this configuration, since the graphite sheet is integrated with the ceramic substrate via the metal oxide layer, the thermal conductivity of the graphite sheet to the ceramic substrate can be enhanced.

以下、本発明の一実施形態について図を用いながら説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図1は、セラミクス基板1を用いた機能性セラミクス部品の一例である積層型高周波スイッチ2の上面にグラファイトシート3を設けた複合部品4に対して発熱部品の一例である高周波増幅器5を実装した高周波モジュールを示した模式図である。   In FIG. 1, a high-frequency amplifier 5, which is an example of a heat-generating component, is mounted on a composite component 4 in which a graphite sheet 3 is provided on the upper surface of a multilayer high-frequency switch 2 which is an example of a functional ceramic component using a ceramic substrate 1. It is the schematic diagram which showed the high frequency module.

また、積層型高周波スイッチ2は複数の誘電体層から構成されたセラミクス基板1の内層部分において電極パターン6によりインダクタやコンデンサやストリップラインを形成したセラミクス基板1に加えて基板内で形成しにくいダイオードなどの回路素子7をセラミクス基板1の上面に実装することで高周波スイッチ回路を形成したもので、この積層型高周波スイッチ2の上面には高周波増幅器5から生じる熱を高周波増幅器5の実装面における面内方向に分散するためのグラファイトシート3が設けられた構成となっている。   The multilayer high-frequency switch 2 is a diode that is difficult to form in the substrate in addition to the ceramic substrate 1 in which the inductor, capacitor, and strip line are formed by the electrode pattern 6 in the inner layer portion of the ceramic substrate 1 composed of a plurality of dielectric layers. A high frequency switch circuit is formed by mounting circuit elements 7 such as the above on the upper surface of the ceramic substrate 1, and heat generated from the high frequency amplifier 5 is formed on the upper surface of the laminated high frequency switch 2 on the surface of the mounting surface of the high frequency amplifier 5. The graphite sheet 3 for dispersing inward is provided.

つまり、この高周波モジュールが積層型高周波スイッチ2を形成するセラミクス基板1の上面にグラファイトシート3を設けた複合部品4に高周波増幅器5が実装された構成となっている。   That is, the high-frequency module has a configuration in which the high-frequency amplifier 5 is mounted on the composite component 4 in which the graphite sheet 3 is provided on the upper surface of the ceramic substrate 1 on which the multilayer high-frequency switch 2 is formed.

なお、グラファイトシート3としてはポリイミド等の高分子樹脂シートを1200度以上の温度で炭化させ、その後、2600度以上の温度でグラファイト化し、図2に示されるように炭素が2次元的に密な結合した炭素層の多層構造体とし、炭素の結合面内において高い熱伝導特性を示すものや、膨張黒鉛を層状に成形したものや、グラファイトファイバーを層状に成形したものなどが挙げられる。   As the graphite sheet 3, a polymer resin sheet such as polyimide is carbonized at a temperature of 1200 ° C. or higher, and then graphitized at a temperature of 2600 ° C. or higher, so that the carbon is two-dimensionally dense as shown in FIG. Examples include a multi-layer structure of bonded carbon layers, which exhibits high heat conduction characteristics in the bonding surface of carbon, one in which expanded graphite is formed into a layer, and one in which graphite fiber is formed into a layer.

そして、積層型高周波スイッチ2とグラファイトシート3からなる複合部品4においては、図1に示されるごとくグラファイトシート3と積層型高周波スイッチ2の間に酸化金属層8が設けられた構造となっており、この構造により複合部品4上に実装された高周波増幅器5から生じる熱を効率よく積層型高周波スイッチ2に分散させることが出来るのである。   The composite component 4 including the multilayer high-frequency switch 2 and the graphite sheet 3 has a structure in which a metal oxide layer 8 is provided between the graphite sheet 3 and the multilayer high-frequency switch 2 as shown in FIG. With this structure, the heat generated from the high-frequency amplifier 5 mounted on the composite component 4 can be efficiently distributed to the multilayer high-frequency switch 2.

この点については、例えば図3に示されるように酸化金属層8がグラファイトシート3上にメッキ工法やスパッタリング工法により金属層を形成した後に、この金属層を化学的処理或いは酸化雰囲気中で加熱処理することで表面酸化させ、この酸化金属層8を設けたグラファイトシート3を積層型高周波スイッチ2を形成するセラミクス基板1の未焼結体の上面に積み重ねこれらを一体焼成することで、焼成段階において酸化金属層8または酸化金属層8中に含まれる酸素がセラミクス基板1を形成する組成、例えばアルミナやシリカといった酸化性物質と結合し焼成後においてはセラミクス基板1とグラファイトシート3が一体化されると考えており、従来のようなセラミクス基板1とグラファイトシート3を接着するための樹脂接着層を設ける必要性が無くなり、グラファイトシート3からセラミクス基板1への熱伝導効率が高められるのである。   In this regard, for example, as shown in FIG. 3, after the metal oxide layer 8 is formed on the graphite sheet 3 by a plating method or a sputtering method, the metal layer is subjected to chemical treatment or heat treatment in an oxidizing atmosphere. Then, the graphite sheet 3 provided with the metal oxide layer 8 is stacked on the upper surface of the green body of the ceramic substrate 1 that forms the multilayer high-frequency switch 2, and these are integrally baked in the baking stage. The metal oxide layer 8 or oxygen contained in the metal oxide layer 8 is combined with an oxidizing substance such as alumina or silica, for example, to form the ceramic substrate 1, and after firing, the ceramic substrate 1 and the graphite sheet 3 are integrated. A conventional resin adhesive layer for bonding the ceramic substrate 1 and the graphite sheet 3 to each other. Kicking eliminates the need and the heat conduction efficiency from the graphite sheet 3 to ceramic substrate 1 is enhanced.

すなわち、高周波増幅器5で生じた局所的な熱をグラファイトシート3にてシート面内方向に素早く分散し、この分散された熱をヒートシンクとなる積層型高周波スイッチ2に伝達するので、高周波増幅器5に対する熱伝導性をより高いものと出来るのである。   That is, the local heat generated in the high frequency amplifier 5 is quickly dispersed in the sheet surface direction by the graphite sheet 3 and this dispersed heat is transmitted to the laminated high frequency switch 2 serving as a heat sink. The thermal conductivity can be made higher.

なお、グラファイトシート3はその微細構造が層状となっておりセラミクス基板1より軟質なものであるため、高周波増幅器5を硬質なセラミクス基板1からなる積層型高周波スイッチ2上に実装した場合においても、グラファイトシート3が高周波増幅器5に対する落下衝撃などの外部応力に対する緩衝材としても機能することとなり、これらを一体化した高周波スイッチモジュールの信頼性を高めることが出来るのである。   Since the graphite sheet 3 has a layered microstructure and is softer than the ceramic substrate 1, even when the high frequency amplifier 5 is mounted on the laminated high frequency switch 2 made of the hard ceramic substrate 1, The graphite sheet 3 also functions as a buffer material against external stress such as a drop impact on the high frequency amplifier 5, and the reliability of the high frequency switch module in which these are integrated can be improved.

また、上述した一実施形態においてはセラミクス基板1を用いた積層型高周波スイッチ2を、発熱部品として高周波増幅器5を挙げて説明したが、本発明はこのような限定にとらわれるものではなく、発熱部品が実装されるセラミクス基板1にグラファイトシート3を一体化させた複合部品4において同様の作用、効果を奏するものである。   In the above-described embodiment, the multilayer high-frequency switch 2 using the ceramic substrate 1 has been described with the high-frequency amplifier 5 as a heat-generating component. However, the present invention is not limited to such a limitation. In the composite component 4 in which the graphite sheet 3 is integrated with the ceramic substrate 1 on which is mounted, the same operations and effects are exhibited.

また、この一実施形態においてはグラファイトシート3をセラミクス基板1の上面に配置した構造を挙げて説明したが、これとは別に特に図示はしていないがグラファイトシート3をセラミクス基板1の内層部分に埋設した構造とした場合においてもほぼ同様の効果を奏するものである。ただし、この場合においては上述した外部応力に対する緩衝機能は働かないこととなる。   In this embodiment, the structure in which the graphite sheet 3 is disposed on the upper surface of the ceramic substrate 1 has been described. However, although not particularly illustrated, the graphite sheet 3 is used as an inner layer portion of the ceramic substrate 1. Even in the case of an embedded structure, the same effect can be obtained. However, in this case, the buffer function against the external stress described above does not work.

本発明は、セラミクス基板に設けられるグラファイトシート関し、セラミクス基板に対する熱伝導性を高められるという効果を有し、特に小型高機能化の進む電子機器に用いられるグラファイトシートに有用である。 The present invention relates to a graphite sheet provided on the ceramic substrate, has the effect of increased thermal conductivity for ceramic substrates, it is useful in the graphite sheet used in electronic devices, especially travel of small high functionality.

本発明の一実施形態におけるグラファイトシートを用いた高周波スイッチモジュールを模式的に表した断面図Sectional drawing which represented typically the high frequency switch module using the graphite sheet in one Embodiment of this invention 同グラファイトシートの構造を示す模式図Schematic diagram showing the structure of the graphite sheet 同グラファイトシートとセラミクス基板の接合方法を示す模式図Schematic showing the method of joining the graphite sheet and ceramic substrate

符号の説明Explanation of symbols

1 セラミクス基板
3 グラファイトシート
8 酸化金属層
1 Ceramic substrate 3 Graphite sheet 8 Metal oxide layer

Claims (1)

発熱部品が実装されるセラミクス基板に設けられる微細構造が層状のグラファイトシートであって、前記グラファイトシートと前記セラミクス基板上面の間に酸化金属層を設け、前記セラミクス基板と前記酸化金属層とを焼成により結合し一体化したグラファイトシート。 And microstructures provided on the ceramic substrate which heat generating component is mounted is a graphite sheet layered, the metal oxide layer between the ceramic substrate top surface and the graphite sheet is provided, the firing and the metal oxide layer and the ceramic substrate Combined and integrated graphite sheet.
JP2005153486A 2005-05-26 2005-05-26 Graphite sheet Expired - Fee Related JP4422068B2 (en)

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