JP2012515254A - カーボンアルミニウム複合材料の温度特性の強化 - Google Patents
カーボンアルミニウム複合材料の温度特性の強化 Download PDFInfo
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Abstract
Description
1)炭素質骨格の品質を制御する;
2)全体的な熱伝導度の増加を供与する金属及び炭素質骨格間の界面層をもたらす;
3)複合材料の性能を損なう不必要な化学的副産物を抑制する;及び、
4)複合材料の性能を強化する特定の化学的生成物を提供する。
これらの結果により、複合材料の熱的及び物理的な特性を強化することができる。
熱伝導度は、三大寄与、すなわち電子、フォノン及び磁気に基づき得る。総熱伝導度(式7)は、各寄与用語の和として表現される:
本開示は、非常に小さい微粒子を有する非常に組織化された黒鉛状カーボンを含み、整列配置され、次いで高圧の下で加熱されて多孔性の、炭素質骨格材料を創成するための炭素質マトリックス(本願明細書において「カーボン含有するマトリックス」又は「炭素質骨格」とも称される)について記載する。炭素質骨格材料は、次いで高熱及び高圧力の下で溶融金属を注入される。金属の添加は、炭素質骨格の強度を増加し、同時に炭素質骨格の空隙を充填することによって物理的特性を強化する。
炭素質マトリックスの黒鉛状カーボンは、産業用コークス生成物に基づき得る。石炭及び石油産業においては、カーボン残渣を天然資源又は精練プロセスから誘導できる。幾つかの実施形態において、石油製品から誘導されるより高い品質の針状コークスは、炭素質マトリックスを形成するために利用され得る。図1Aは、図1Bに示される低品質のコークスと比較したより高品質の針状コークスの走査型電子顕微鏡(SEM)写真である。ピッチ/タールもまた、針状コークスに添加されることができて、主にバインダとして機能し、2600℃以上、一般的には3200℃〜3600℃の範囲の温度で加温される間、黒鉛状カーボンに変わる。生の黒鉛材料は、粗い黒鉛粒子と0.2mm〜2mmの範囲の平均寸法を有する微細な黒鉛粒子とを含んでも良い。幾つかの実施形態において、粒子の約10%は、楕円状の形を呈する。図2は、「a」とラベルが付された粗粒子構造と、「b」とラベルが付され、矢印で示す楕円状粒子の微細な粒子構造とのSEM写真である。
炭素質マトリックスの結晶性黒鉛内の熱伝導度は高いものの、ポケット及び細孔(本開示では、「空隙」とも称する)がマトリックス内に存在する。フォノンは黒鉛を通して直ちに伝送されるが、フォノンが空隙に直面するときに、エネルギーは反射し戻されて材料内に消散する。機械的に強く熱的に伝導性の材料はこれらの細孔に注入され、炭素質マトリックスを通してより効率的な熱伝達を促進でき、同時に特定の様式で機械的特性を強化するか又は変更する。加えて、プロセスの温度及び圧力は、アルミニウムカーバイドの如き特定の生成物の形成を抑制するべく制御され、更に炭素質マトリックスの空隙の最大充填を保証するべく制御される。
プロセスパラメータは、特別にドープした溶融アルミニウム合金による炭素質マトリッ
クスの含浸プロセス用に最適化されている。これらのプロセスパラメータの制御を通して、アルミニウム及び炭素質マトリックス間のナノメータ的界面が創成される。図10は、炭素質マトリックス及び金属間の界面の含浸及び創成のプロセスを図示する。図10に示す通り、炭素質マトリックスは細孔及び空隙を有する。この例示アルミニウムにおいて、溶融金属は特定の温度で特定の時間炭素質マトリックスに注入され、溶融金属は炭素質マトリックスの細孔の少なくとも一部を充填する。溶融金属は、シリコンの如き化学的添加剤(図10にて「A」とラベル付け)を含んでも良い。最初に、金属はまずカーボンに接触して界面を創成する。プロセスの温度及び圧力は、添加剤の少なくとも一部をカーボン/金属界面に拡散させる。プロセス条件の下で反応が起こり、界面でカーバイド材料が生成する。プロセスパラメータ、すなわち温度及び圧力、の制御でアルミニウム及び炭素質マトリックス間の界面が創成する。更に、界面の厚さ及び組成は、プロセス条件が適用される時間に依存し得る。界面は、ナノメータ単位の厚さを有する。反応に寄与しない余剰の添加剤は、アルミニウム内に残留する。
熱エネルギー(熱)の移送は、フォノンによって達成される。フォノンは材料内の格子振動である。フォノンは材料の散乱点(材料欠陥)又は縁(界面)に着くまで、材料を経て伝播する。従って、フォノンは欠陥部位に当たるか、材料によって吸収されるか又は外側端に当たるまで続行する。縁界面でフォノンは非常に減少した(放射又は結合)エネルギーで続行できるか、又は反射されて材料に戻れて、乏しいフォノン伝搬及び低い熱移動を齎す。図8に関して記載されている方法を介して生成されるカーボン−アルミニウム複合材料は、図10に示す通り、複合材料の黒鉛状シートの端にカーボン/アルミニウム界面を含み得る。このように、複合材料のカーボン及びアルミニウム間の境界としてエネルギー障壁が掲げられる。その上、アルミニウムの反射率を得て、フォノンは再び炭素質マトリックス中へ戻され、そこでフォノンは結局熱として吸収され得る。しかしながら、複合材料のカーボン及びアルミニウム間の滑らかな界面層の創成によって、カーボン/アルミニウム界面を亘ってフォノンはより効率的に進み続け得る。
(i) シリコンの添加はアルミニウムの融点を低減し得て、炭素質骨格への金属含浸のプロセスの間の少ない電力消費に導く。
(ii) シリコンの添加は溶融アルミニウム液の粘度を低減し得て、多孔性の炭素質骨格のいかなる空隙をも充填することを容易にする。充分な空隙の充填は、複合材料の温度管理挙動を改良できて、更にカーボン−アルミニウム複合材料の材料強度及び頑健性を強化できる。
(iii) シリコン添加剤は界面のシリコン結晶及びシリコン系カーバイドの形成によるAl4C3を効果的に抑制し得る。Al4C3は、もろくて、吸湿性で、低熱伝導度を有する。従って、Al4C3の抑制は、カーボン−アルミニウム複合材料の熱伝導、機械的特性、化学的安定性及び耐浸食性を改良し得る。
カーボン材料及び溶融金属は、材料間の乏しい親和力のために、乏しい湿潤性を有し得る。従って、炭素質マトリックスに適用される溶融アルミニウムは炭素質マトリックスの表面を濡らし得ず、高接触角を齎して溶融アルミニウムが共にビードとなる。このように、アルミニウム及び炭素質マトリックス間の接触損失は、アルミニウム及び炭素質マトリックス間の界面に空隙を創成し得る。
Al4C3の形成は、アルミニウム及び炭素質マトリックス間のフォノンカップリング及び伝搬を低下させ、このように複合材料の機械的強度と同様に熱伝導度を低下させる。シリコンドーパントは含浸プロセスの間に添加できて、アルミニウム及び炭素質マトリックス間の界面に移動し、アルミニウムカーバイドの形成を抑制できる。シリコンドーパント及びアルミニウムカーバイド形成間の関係は、以下の反応式によって記載できる:
http://www.kfki.hu/〜anyag/tartalom/min2001jul/kaptay_yaghmaee.htm.
Claims (24)
- 黒鉛結晶性カーボン材料、カーボン粉末、人工黒鉛粉末又はこれらの組合せから成る群から選択される少なくとも1種類の炭素材料を含むカーボン含有マトリックス、カーボン含有マトリックスが複数の細孔を含む、
アルミニウム、アルミニウム合金又はこれらの組合せを含む金属成分、金属成分が複数の細孔の少なくとも一部に配置される; 及び
少なくともシリコンを含む添加剤、少なくとも一部の添加剤は、細孔内の金属成分とカーボン含有マトリックスとの界面に配置され、添加剤がフォノンカップリングと界面における伝搬を強化する、
を含む製造物。 - 金属成分が複数の細孔の少なくとも90体積%に配置される、請求項1に記載の製造物。
- 添加剤が金属成分及び界面に配置される、請求項1に記載の製造物。
- 添加剤が11質量%未満の金属成分を含む、請求項3に記載の製造物。
- 添加剤が5質量%超の金属成分を含む、請求項3に記載の製造物。
- 添加剤がシリコン結晶を含む、請求項1に記載の製造物。
- 界面がシリコン結晶、シリコンカーバイド、AlaSibCc及びこれらの組合せを含む、請求項1に記載の製造物。
- 1%以下のAl4C3を更に含む、請求項1に記載の製造物。
- 界面の厚さが100ナノメートル未満である、請求項1に記載の製造物。
- 熱伝導度が300W/mK〜600W/mkの範囲内である、請求項1に記載の製造物。
- 熱拡散率が0.8cm2/秒〜3.2cm2/秒の範囲内である、請求項1に記載の製造物。
- 請求項1の製造物を生成する方法であって、
型にカーボン含有マトリックス、金属成分及び添加剤を提供すること;
型を80MPa〜100MPaの範囲に加圧して、10分〜20分の範囲の間、700℃〜800℃の範囲の温度とすること、
を含む方法。 - カーボン含有マトリックスを700℃〜750℃の範囲の温度まで予熱すること、及び型を加圧する前に鋳型及び金型を約250℃の温度まで予熱することを更に含む、請求項12に記載の方法。
- 型を加圧する前に700℃〜750℃の範囲の温度で金属成分を溶融することを更に含む、請求項12に記載の方法。
- 金属成分を溶融する前に添加剤と金属成分とを予め混合することを更に含む、請求項14に記載の方法。
- 金属成分を溶融した後に金属成分へ添加剤を添加することを更に含む、請求項14に記載の方法。
- カーボンブロックを3200℃〜3600℃の範囲の温度で2日〜3日の範囲の間加熱してカーボン含有マトリックスを形成することを更に含む、請求項12に記載の方法。
- 800℃〜500℃の範囲の温度で石油コルク、針状コルク、タール又はこれらの混合物を押出してカーボンブロックを形成することを更に含む、請求項17に記載の方法。
- 請求項1の製造物を機械加工して熱伝達デバイスとすることを更に含む、請求項12に記載の方法。
- カーボン含有マトリックス、ある量のシリコン及び固形又は溶解アルミニウム若しくはアルミニウム合金を型へ提供すること、カーボン含有マトリックスは、黒鉛結晶性カーボン材料、カーボン粉末及び人工黒鉛粉末から成る群から選択される少なくとも1種類のカーボン材料を含む、及び
型を80MPa〜100MPaの範囲に加圧して、10分〜20分の範囲の間、700℃〜800℃の範囲の温度とすること、
を含む方法により生成される製造物。 - 黒鉛結晶性カーボン材料、カーボン粉末、人工黒鉛粉末又はこれらの組合せから成る群から選択される少なくとも1種類の炭素材料を含むカーボン含有マトリックス、カーボン含有マトリックスは複数の細孔を含み、カーボン含有マトリックスは、高圧成型プレスによって形成される;
アルミニウム、アルミニウム合金又はこれらの組合せを含む金属成分、金属成分は複数の細孔の少なくとも一部に配置される; 及び
少なくともシリコンを含む添加剤、少なくとも一部の添加剤は、細孔内の金属成分とカーボン含有マトリックスとの界面に配置され、添加剤はフォノンカップリングと界面における伝搬を強化する、
を含む製造物 - 最大熱伝導度が、カーボン含有マトリックス形成中のカーボン含有マトリックス上に高圧成型プレスによって発揮される圧力の方向に対して垂直な方向に存在する、請求項21に記載の製造物。
- 黒鉛結晶性カーボン材料、カーボン粉末、人工黒鉛粉末又はこれらの組合せから成る群から選択される少なくとも1種類の炭素材料を含むカーボン含有マトリックス、カーボン含有マトリックスは複数の細孔を含み、カーボン含有マトリックスは、押出しによって生成される;
アルミニウム、アルミニウム合金又はこれらの組合せを含む金属成分、金属成分は複数の細孔の少なくとも一部に配置される; 及び
少なくともシリコンを含む添加剤、少なくとも一部の添加剤は、細孔内の金属成分とカーボン含有マトリックスとの界面に配置され、添加剤はフォノンカップリングと界面における伝搬を強化する、
を含む製造物。 - 最大熱伝導度がカーボン含有マトリックス形成中の押出し方向に対して平行に存在する、請求項23に記載の製造物。
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- 2009-12-03 WO PCT/US2009/066582 patent/WO2010065739A1/en active Application Filing
- 2009-12-03 CN CN2009801491239A patent/CN102301039A/zh active Pending
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- 2009-12-03 JP JP2011539694A patent/JP2012515254A/ja active Pending
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Also Published As
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WO2010065739A1 (en) | 2010-06-10 |
KR20110095393A (ko) | 2011-08-24 |
EP2352863A1 (en) | 2011-08-10 |
CN102301039A (zh) | 2011-12-28 |
EP2352863A4 (en) | 2012-07-04 |
US20110027603A1 (en) | 2011-02-03 |
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