JP2009256117A - 炭素繊維炭素複合成形体及び炭素繊維強化炭素複合体材料並びにその製造方法 - Google Patents
炭素繊維炭素複合成形体及び炭素繊維強化炭素複合体材料並びにその製造方法 Download PDFInfo
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Abstract
【解決手段】ピッチ系炭素繊維をX軸及びY軸の面方向にランダムに分散させたシート状分散体を積層した炭素繊維積層体の炭素繊維の表面上に熱分解炭素を堆積して該炭素繊維の周囲を被覆することにより、前記炭素繊維積層体内に熱分解炭素が充填されていることを特徴とする炭素繊維炭素複合成形体及びこれを用いて得られる炭素繊維強化炭素複合材料。
【選択図】図1
Description
ピッチ系炭素繊維(12Kのフィラメントヤーン、平均直径9μm、密度1.93Mg/m3)を30〜100mm程度となるように切断し、アセトン等を用いてサイジング剤を除去した。この炭素繊維を、ランダムな方向に分散させ、炭素繊維100質量部に対して30質量部のフェノール樹脂を用いて炭素繊維を固定し、X軸及びY軸の面方向にランダムに炭素繊維が分散したシート状のプリプレグ(厚み約0.5mm)を作製した。このプリプレグを乾燥機中で約100℃にて予備乾燥した。乾燥後のプリプレグを約100枚重ねて、ホットプレスを用いて圧力0.3MPa、温度150℃の条件で加圧し、成形した。次に、約2000℃で熱処理することにより、50mm×50mm×50mmの大きさの炭素繊維積層体を得た。この炭素繊維積層体の密度は、0.15Mg/m3であった。
炭素繊維強化炭素複合材料から10mm×10mm×60mmの形状の試料を切り出し、表面をRz12μmよりも平滑に仕上げた状態で、秤を用いて質量を測定し、マイクロメーターを用いて長さを求めた。三方向の長さを乗して体積を求めた。密度は、質量を体積で除して求めた。
JIS(日本工業規格)R1611−1997に準じ、熱伝導率=熱拡散率×比熱容量×かさ密度の式から熱伝導率を求めた。直径10mm×3mmの試料を作成し、ULVAC社製のレーザーフラッシュ法熱定数測定装置(TC−7000UVH)を用いて熱拡散率を測定した。
X線回折装置を用い、Cu−Kα線をNiフィルタで単色化し、高純度シリコンを標準物質として学振法により測定した。黒鉛結晶のd(112)面の測定は、炭素繊維強化炭素複合材料を粉末化し、この粉末を用いて測定した。
実施例1と同様にして、炭素繊維積層体に熱分解炭素を充填させ、次に易黒鉛化性のキノリン不溶分が少ないピッチの浸漬と熱処理を繰り返し、その後黒鉛化のための熱処理を行った。
実施例1と同様にして、炭素繊維積層体に熱分解炭素を含有させ、その後ピッチの浸漬と熱処理を繰り返した後、黒鉛化の熱処理を行って、炭素繊維強化炭素複合材料を得た。
実施例1と同様にして炭素繊維積層体に熱分解炭素を含有させ、その後ピッチの浸漬と熱処理を繰り返し、その後黒鉛化のための熱処理を行った。炭素繊維積層体の密度は0.25Mg/m3であり、熱分解炭素含有させた後の密度は1.65Mg/m3であり、ピッチの浸漬と熱処理を行った後の密度は1.85Mg/m3であり、黒鉛化熱処理後における黒鉛結晶のd(112)面の結晶厚みは8nmであった。
密度0.20Mg/m3の炭素繊維積層体に熱分解炭素を充填させ、密度を1.50Mg/m3とした。次いで、コールタールピッチの浸漬と熱処理を繰り返し、浸漬後の密度を1.85Mg/m3とした。その後、黒鉛化のための熱処理を行った。黒鉛化熱処理後における黒鉛結晶のd(112)面の結晶厚みは8nmであった。得られた炭素繊維強化炭素複合成形体のX−Y平面における熱伝導率は、400〜450W/(m・K)、Z軸方向では140W/(m・K)であった。
密度0.20Mg/m3の炭素繊維積層体に熱分解炭素を充填させ、密度を1.65Mg/m3とした。次いで、コールタールピッチの浸漬と熱処理を繰り返し、浸漬後の密度を1.85Mg/m3とした。その後、黒鉛化のための熱処理を行った。黒鉛化熱処理後における黒鉛結晶のd(112)面の結晶厚みは6nmであった。得られた炭素繊維強化炭素複合成形体のX−Y平面における熱伝導率は、400〜450W/(m・K)、Z軸方向では100W/(m・K)であった。
実施例1のピッチ系炭素繊維であって、長さが30〜100mmである短い炭素繊維を用いてカーディングを行い、有機質バインダーでマット化することで、X軸及びY軸の面方向に炭素繊維がランダムに分散した、50mm×50mm×50mmのマット状分散体(密度は0.15Mg/m3)を得た。易黒鉛化性のラフコラムナー組織を有する熱分解炭素を充填させ、密度を1.65Mg/m3とした。次いで、コールタールピッチの浸漬と熱処理を繰り返し、浸漬後の密度を1.85Mg/m3とした。その後、黒鉛化のための熱処理を行った。黒鉛化熱処理後における黒鉛結晶のd(112)面の結晶厚みは8nmであった。得られた炭素繊維強化炭素複合成形体のX−Y平面における熱伝導率は、450〜550W/(m・K)、Z軸方向では140W/(m・K)であった。
密度0.05Mg/m3の炭素繊維積層体の場合には、その後の工程において破損を伴うことが多く、形状を維持することができなかった。
密度0.5Mg/m3の炭素繊維積層体の場合には、熱分解炭素を充填しても、密度1.00Mg/m3と含有量が少なく、その後、約3000℃で熱処理を行ったが、得られた炭素繊維強化炭素複合成形体のX−Y平面における熱伝導率は、100W/(m・K)、Z軸方向では10W/(m・K)であった。
図3は、本発明に従う実施例2の炭素繊維強化複合材料における断面を示すSEM写真である。図3に示すように、本発明に従う実施例においては、炭素繊維の周囲に熱分解炭素からなる被覆層が形成されている。この熱分解炭素からなる被覆層は、同心円状のオニオン構造を有している。
2…炭素繊維積層体
3…半導体装置
4…放熱材料
5…台座
Claims (16)
- 炭素繊維をX軸及びY軸の面方向にランダムに分散させた炭素繊維積層体の炭素繊維の表面上に熱分解炭素を堆積して該炭素繊維の周囲を被覆することにより、前記炭素繊維積層体内に熱分解炭素が充填されていることを特徴とする炭素繊維炭素複合成形体。
- 前記炭素繊維積層体は、炭素繊維をX軸及びY軸の面方向にランダムに分散させたシート状分散体を積層したものであることを特徴とする請求項1に記載の炭素繊維炭素複合成形体。
- 前記炭素繊維積層体が、炭素繊維をX軸及びY軸の面方向にランダムに分散させた分散体に樹脂を含浸させてプリプレグとし、該プリプレグを複数枚積層して加圧成形した後、熱処理して得られるものであることを特徴とする請求項2に記載の炭素繊維炭素複合成形体。
- 前記炭素繊維積層体が、炭素繊維を用いてカーディングを行い、バインダーでマット化して得られるマット状分散体であることを特徴とする請求項1に記載の炭素繊維炭素複合成形体。
- 前記炭素繊維がピッチ系炭素繊維であることを特徴とする請求項1〜4のいずれか1項に記載の炭素繊維炭素複合成形体。
- 密度が、1.50〜1.80Mg/m3であることを特徴とする請求項1〜5のいずれか1項に記載の炭素繊維炭素複合成形体。
- 熱分解炭素を充填させた後、ピッチを含浸させたことを特徴とする請求項1〜5のいずれか1項に記載の炭素繊維炭素複合成形体。
- 密度が、1.60〜2.00Mg/m3であることを特徴とする請求項7に記載の炭素繊維炭素複合成形体。
- 請求項7または8に記載の炭素繊維炭素複合成形体の黒鉛結晶を成長させたことを特徴とする炭素繊維強化炭素複合材料。
- X線回折による黒鉛結晶の112面の厚みが6nm以上であることを特徴とする請求項9に記載の炭素繊維強化炭素複合材料。
- 請求項9または10に記載の炭素繊維強化炭素複合材料を製造する方法であって、
密度が0.10〜0.40Mg/m3である前記炭素繊維積層体を調製する工程と、
前記炭素繊維積層体の炭素繊維の表面上に熱分解炭素を堆積させて、密度が1.50〜1.80Mg/m3の炭素繊維炭素複合成形体を調製する工程と、
前記炭素繊維炭素複合成形体に、密度が1.60〜2.00Mg/m3となるまでピッチを含浸させる工程と、
ピッチを含浸させた前記炭素繊維炭素複合成形体を、X線回折による黒鉛結晶の112面の厚みが6nm以上となるまで熱処理する工程とを備えることを特徴とする炭素繊維強化炭素複合材料の製造方法。 - 請求項9または10に記載の炭素繊維強化炭素複合材料または請求項11に記載の方法で製造された炭素繊維強化炭素複合材料を用いたことを特徴とする放熱材料。
- 前記炭素繊維強化炭素複合材に金属を含浸させたことを特徴とする請求項12に記載の放熱材料。
- 前記金属が、銅またはアルミニウム合金であることを特徴とする請求項13に記載の放熱材料。
- 前記炭素繊維強化炭素複合材料、または請求項13もしくは14に記載の放熱材料の表面に金属を被覆させたことを特徴とする放熱材料。
- 被覆するための前記金属が、鉄、銅、アルミニウム、鉄合金、銅合金およびアルミニウム合金のうちから選ばれる1種以上であることを特徴とする請求項15に記載の放熱材料。
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- 2009-04-06 KR KR1020107022838A patent/KR20100135798A/ko not_active Application Discontinuation
- 2009-04-06 CN CN2009801131178A patent/CN102007090A/zh active Pending
- 2009-04-06 EP EP09732179A patent/EP2289861A1/en not_active Withdrawn
- 2009-04-06 US US12/936,683 patent/US20110030940A1/en not_active Abandoned
- 2009-04-06 WO PCT/JP2009/001583 patent/WO2009128215A1/ja active Application Filing
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2020182745A (ja) * | 2019-05-09 | 2020-11-12 | 穴織カーボン株式会社 | 加熱調理器及びその製造方法 |
JP7085757B2 (ja) | 2019-05-09 | 2022-06-17 | 穴織カーボン株式会社 | 加熱調理器及びその製造方法 |
Also Published As
Publication number | Publication date |
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TW201006784A (en) | 2010-02-16 |
CA2720972A1 (en) | 2009-10-22 |
CN102007090A (zh) | 2011-04-06 |
EP2289861A1 (en) | 2011-03-02 |
US20110030940A1 (en) | 2011-02-10 |
WO2009128215A1 (ja) | 2009-10-22 |
JP5352893B2 (ja) | 2013-11-27 |
KR20100135798A (ko) | 2010-12-27 |
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