成果報告書詳細
管理番号20120000000773
タイトル*平成23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
公開日2012/7/5
報告書年度2011 - 2011
委託先名国立大学法人神戸大学 神港精機株式会社 パレス化学株式会社 株式会社ティサポート
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,基油にわずか0.1wt.%添加したカーボンオニオンが示す超低摩擦の機構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現在使用されている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.
英文要約Chlorine-free Heavy-Machining Materialized by the Super-low Friction of Carbon Onions under High Contact Pressure (FY2009-FY2012) FY2011 Annual Report
The pollution caused by dioxins, the derivatives of chlorine used in heavy-machining fluid, is the global issue. Chlorines have been indispensable lubricant additive for such heavy-machining as stainless steel, but the international regulation of chlorines is rapidly in progress. The aim of this experimental study was to elucidate possible application of carbon onions to heavy-machining by replacing chlorine additives. The background of this study is that carbon onions provide super–low friction under high contact pressure when added to base oil. Low friction coefficient of 0.06, low wear with half an amount of that in base oil, and the load-carrying property up to 2GPa were targeted.
The first goal is to verify the mechanism of super-low friction of carbon onions. 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 that of poly-alpha-olefin alone resulted from the sliding experiments between 52100 steel ball and plate. Carbon onion films exhibit low friction coefficient even in air. Thus, carbon onions have good lubricating ability by themselves. Nanometer-scaled slip between onion skins (nano-slip) is a strong reason.
In view of the industrial application, mass-production of carbon onions with low prices is essential. Penning Ionization Gage discharge of C2H2 resulted in successful synthesis of carbon onions. To increase the amount of carbon onions, the synthesis of carbon onions was made by two processes; the first step is to deposit diamond-like carbon particles under the discharge at a few Pa C2H2, and the second step to transform these powders to carbon onions by heating in vacuum or inert gas at about 1600 °C. The manufacturing rate of diamond-like carbon powder increased to 10 grams/hour or more. A vacuum annealing apparatus capable of transforming 600g diamond-like carbon powder into carbon onion has been designed and will be accomplished soon. Synthesis of carbon onions from CO2 may contribute to global warming. Using micro-wave plasma enhanced chemical vapor deposition, the synthesis of carbon onion from CO2 was attempted at the pressure of 100~200Pa with the flow rate of 50sccm. Simultaneous laser irradiation during chemical vapor deposition led to the formation of carbon onions. The separation of carbon onion from other nano carbons became possible by the centrifugal separator. Transmission electron microscopy, X-ray diffraction, Raman spectroscopy and electron spin resonance identified carbon onions.
The third and the final research project is the development of working fluid containing carbon onions for commercial use. For this purpose, the selection, determination and optimization of dispersion agent, base oil and other chemical agents are investigated, and under high contact pressure low friction coefficient was observed by laboratory tests. Field tests with simulated actual machines are being carried out in order to develop working fluid added with carbon onions.
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