成果報告書詳細
管理番号20110000001304
タイトル*平成22年度中間年報 ナノテク・先端部材実用化研究開発/カーボンオニオンの高面圧下超低摩擦の発現を応用した難加工における塩素フリー化(1)
公開日2011/8/30
報告書年度2010 - 2010
委託先名国立大学法人神戸大学
プロジェクト番号P05023
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 本研究開発項目では,カーボンオニオンが示す優れたトライボロジー特性をナノトライボロジーの視点で解明し,ステンレス鋼などの難加工において塩素添加油と同等もしくはそれ以上の性能を発揮させるための工業的指針を与えることを目的とした.申請時においてはカーボンオニオン添加ポリアルファオレフィンが1.1GPaまでの圧力において摩擦係数0.07,摩耗量が基油のみの場合と比較して1/2~2/3が得られている.これらをさらに高性能化し、摩擦係数0.06,耐摩耗性は基油の1.5倍,耐圧力は2GPaを与えるトライボロジーシステムを実現し,超低摩擦機構を解明することを目標とした.ダイヤモンドナノ粒子からカーボンオニオンを作製し,基油であるポリアルファオレフィンに0.1~数wt.%添加し,接触圧力を変化させてトライボメータを用いて摩擦係数,光学顕微鏡を用いて摩耗量,耐圧力特性を評価して,その優れたトライボロジー特性の根源を明確にすることを目的とした.
英文要約The research aim has been focused on the mechanism of super-low friction of carbon onions when added to poly-alpha-olefin. A possible application of this new lubricant to heavy and difficult cold working was evaluated. Experimental research was carried out to obtain low friction coefficient of 0.06, low wear with half an amount of the base oil, and the load-carrying property of up to 2GPa.
By adding carbon onions to poly-alpha-olefin with 0.1 wt. %, friction coefficient of 0.06 and low wear of about 3/5 of poly-alpha-olefin alone resulted from the sliding experiments of 52100 steel ball-on-plate configuration, verifying the good reproducibility of the previous results described in the proposal. It is amazing to note that carbon onions slid for 1,000 times did not indicate any fracture. The load bearing properties of carbon onions are thus quite high. Therefore, the present experimental results indicate that carbon onions perform as a good lubricating additive when properly added to the base oil.
Carbon onions exhibit low friction coefficient even in air when a smooth film of carbon onion is achieved. Therefore, carbon onions have good lubricating ability by themselves.
Nanometer-scaled slip between onion skins (nano-slip) may lead to low friction, and this mechanism is being investigated in detail.
Carbon onions obtained by heating diamond nano-particles cost high, so that synthesis from gases meets industrial demands. Mass production of carbon onions was successfully made by PIG (Penning Ionization Gage) plasma of acetylene, the production rate of onions being greater than 8 grams/h. The formation of carbon onions was identified by transmission electron microscopy, Raman spectroscopy and X-ray diffraction.
Synthesis of carbon onions from CO and CO2 using microwave plasma chemical vapor deposition was also attempted. It was found in the present experiments that the irradiation of YAG laser during microwave plasma CVD of CO2 was quite effective in synthesizing carbon onions. Irradiation of both pulsed and continuous YAG lasers were effective.
A method that separates carbon onions from carbon nanotube and/or carbon nano-flake has to be developed. To prevent any possibilities of toxic problem, the centrifuge apparatus with an interlock function is stored in a draft chamber, and the test working has been carried out. The centrifugal separator successfully separated the material containing carbon onions from those containing carbon nanotubes.
The development of chlorine-free metal working fluids with an addition of carbon onions was investigated by optimizing dispersion properties of carbon onions, designing appropriate base oil, and by conducting friction and wear tests in laboratory. Poly-alpha-olefin with 0.1 wt. carbon onion showed lower friction coefficient and wear volume that the other carbonaceous materials.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る