1147 粉末冶金法によるマグネシウム合金の低フリクション化のための材料設計

概要

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The tribological properties of the magnesium composite alloys reinforced with solid-state synthesized Mg_2Si or Mg_2Si/MgO dispersoids are evaluated under wet conditions (in engine oil lubricants) by using pin on disc type wear test equipment. Every composite alloy shows a dependence of the friction coefficient on the applied load, which corresponds to Sribeck diagram based on elasto-hydrodynamic lubrication (EHL). The increase of Mg_2Si content causes the increase of both the friction coefficient and the total wear by plowing, because Mg_2Si dispersoids protruded from the surface are much harder than S35C mild steel counter material. When including MgO dispersoids formed in deoxidizing SiO_2 particles by magnesium, the friction coefficient reduces to 0.015-0.025 in oil lubricant. This is due to the "mild offensive effect" by MgO dispersoids which ese the attacking or plowing phenomenon on the counter material, because they are not so hard.
社団法人日本機械学会の論文
2003-08-05