ダンヤモンドと金属の表面原子間の結合力に関する研究

概要

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This paper describes the atomic force based on chemical bonds between diamond and metal (Cu, Fe or Al) surfaces. This atomic force affects the limit of ultra precision machining, therefore, the coefficient of friction on the tool rake face at the time of cutting was measured in vacuum. The measured coefficients of friction of Cu, Fe and Al were 0.18,0.30 and 0.36,respectively. Also, the interaction force based on atomic force was measured in comparison with the coefficient of friction. The interaction force required to separate the elastic contact between the diamond tip and the flat metal plane was measured with a microelectro-balance in an ultra high vacuum. The interaction energy (interfacial energy) calculated by measured interaction force of Cu, Fe and Al were 1.87,2.49 and 3.77J/m^2,respectively. Thus, the coefficient of friction was strongly correlated with the interaction force, or Cu<Fe<Al. This suggested that the friction of metal cutting was caused by the atomic force based on the chemical bond at the interface. In order to estimate the atomic force theoretically, the electron energy of interface was calculated by the local density of electron states. The local density of states of diamond surfaces adsorbed by metals were calculated by using the recursion method based on semi-empirical tight binding theory. The results of calculation predicted that the values of atomic force were Cu<Fe<Al.
公益社団法人精密工学会の論文
1991-05-05