高硬質ナノ粒子添加ワックス素材の滑走特性評価

Abstract

In Ski Jumping and Nordic Skiing, good gliding properties are required for success. Among many parameters, the tribological system is affected by the material properties of the ski running surface and various wax combinations that are applied on the top of the ski sole to minimize kinetic friction. The major research of this study has focused on the material changes due to the waxing process, in addition to the evaluation of the content of fluorine in waxes. Moreover, special attention has been paid to the additives like BN and SiC particles in nanometer size, mixed with high fluorine content waxes as powder. Characterization on the ski base materials, both with and without waxes, were evaluated by X-ray-fluorescence (XRF) analysis, Vickers hardness test, surface roughness analysis, contact angle measurement of water droplets, and tribometry to measure the coefficient of friction (C.O.F). It was found that the fluorine content in waxes on the top surface was not directly affected by the hardness, the surface roughness and the contact angle. The COF on ice was slightly lowered with the increase of fluorine content in waxes. The hardness was significantly improved by the addition of BN and SiC nanoparticles in high fluorine content waxes, especially twice as high as that for the case of BN nanoparticle, without any degradation in the surface roughness and the contact angle.