JP5366193B2 - 高機能複合材料およびその製造方法 - Google Patents
高機能複合材料およびその製造方法 Download PDFInfo
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- JP5366193B2 JP5366193B2 JP2008523622A JP2008523622A JP5366193B2 JP 5366193 B2 JP5366193 B2 JP 5366193B2 JP 2008523622 A JP2008523622 A JP 2008523622A JP 2008523622 A JP2008523622 A JP 2008523622A JP 5366193 B2 JP5366193 B2 JP 5366193B2
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- alumina
- carbon nanotubes
- composite material
- magnesia
- sintering
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- 239000002131 composite material Substances 0.000 title claims abstract description 123
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 143
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 118
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 113
- 239000000919 ceramic Substances 0.000 claims abstract description 97
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 90
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 67
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000013078 crystal Substances 0.000 claims abstract description 58
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 46
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- 238000005245 sintering Methods 0.000 claims description 62
- 238000000034 method Methods 0.000 claims description 38
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 27
- 239000000347 magnesium hydroxide Substances 0.000 claims description 27
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 27
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- 239000002002 slurry Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
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- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
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- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
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- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
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Description
また、本発明に係る高機能複合材料で、前記カーボンナノチューブは、平均長さが1000nmより長く、平均太さが100nmより細いことが好ましい。また、前記第2のアルミナ−マグネシア系セラミックス結晶は、グレインサイズが前記第1のアルミナ−マグネシア系セラミックス結晶のグレインサイズより一桁以上小さいことが好ましい。
アルミナは、工業的にはバイヤー法で製造されている。すなわち、原料のボーキサイトを水酸化ナトリウム溶液と加熱処理してアルミン酸ナトリウム溶液とし、これを希釈してから水酸化アルミニウムの種結晶を加えると、水酸化アルミニウムが析出する。この水酸化アルミニウムを1200℃以上で焼成して、アルミナ粉を製造している。従って、水酸化アルミニウムは、アルミナの前駆体であり、価格はアルミナより低い。この水酸化アルミニウムは、276℃から分解が始まり、375℃でそれが終了し、アルミナ結晶の核を生成する。この核の結晶成長は、1000℃以上で顕著になる。
2 カーボンナノチューブ
3 アルミナ−マグネシア系セラミックス
Claims (8)
- 複数の第1のアルミナ−マグネシア系セラミックス結晶から成るセラミックス多結晶体と、
複数のカーボンナノチューブと複数の第2のアルミナ−マグネシア系セラミックス結晶とが絡み合った構造のナノ複合体とを有し、
カーボンナノチューブを4〜85mass%、アルミナを0.2〜95mass%、マグネシアを1〜27mass%含み、
前記ナノ複合体は前記セラミックス多結晶体の内部に分散されており、
前記第2のアルミナ−マグネシア系セラミックス結晶は、グレインサイズが200nmより小さいことを、
特徴とする高機能複合材料。 - 前記カーボンナノチューブは、平均長さが1000nmより長く、平均太さが100nmより細いことを、特徴とする請求項1記載の高機能複合材料。
- 前記第2のアルミナ−マグネシア系セラミックス結晶は、グレインサイズが前記第1のアルミナ−マグネシア系セラミックス結晶のグレインサイズより一桁小さいことを、特徴とする請求項1または2記載の高機能複合材料。
- 前記ナノ複合体は前記第1のアルミナ−マグネシア系セラミックス結晶のグレインサイズより大きいことを、特徴とする請求項1、2または3記載の高機能複合材料。
- 前記カーボンナノチューブは、単層カーボンナノチューブ、2層カーボンナノチューブ、多層カーボンナノチューブ、非晶質カーボンナノチューブおよびカーボンナノロッドのうちの1種または2種以上の混合物から成ることを、特徴とする請求項1、2、3または4記載の高機能複合材料。
- カーボンナノチューブ4〜85mass%、アルミナ0.2〜95mass%、マグネシア1〜27mass%となるよう、水酸化アルミニウム(Al(OH)3)と水酸化マグネシウム(Mg(OH)2)とを含むアルミナ−マグネシア系セラミックスと、カーボンナノチューブとを水あるいはアルコール類の溶媒に入れ、スラリー状にして3〜180分間混合し、この混合物から前記溶媒を除去した後、非酸化性雰囲気中において1050℃〜1800℃の温度範囲で5分から5時間かけて焼結することを、特徴とする高機能複合材料の製造方法。
- 前記焼結を行うための前処理として、前記混合物から前記溶媒を除去した後、非酸化性雰囲気中おいて300℃〜900℃の温度範囲で5〜60分間仮焼して分解脱水することを、特徴とする請求項6記載の高機能複合材料の製造方法。
- 無加圧焼結法、ホットプレス法または放電プラズマ焼結法により前記焼結を行うことを、特徴とする請求項6または7記載の高機能複合材料の製造方法。
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