습도 및 미끄럼 속도에 따른 질화규소의 마찰 마모 특성에 관한 연구

Abstract

The wear properties of two types of Si_3N_4(silicon nitride) exposed to high and low humidity were examined experimentally for various sliding speed. Bearing steel was used as the disk material at pin-on-disk type sliding. Wear rates of pressureless sintered-plus-hot-isostatic pressed Si3N4 were slightly lower than those of pressureless sintered Si_3N_4. It was observed that adsorbed moisture and sliding speed markedly influenced the wear properties of Si_3N_4. The highest wear rate was obtained under the high humidity and low sliding speed condition. As the sliding speed was increased, wear rates were decreased and the humidity effect on the wear rates of Si_3N_4 was lowered. The result that the Si_3N_4 pin showed a high wear rate under the high humidity condition was explained by the property change due to the adsorbed moisture, plowing action by the hard particles of Fe_2O_3 from the disk, and the corrosion effect at Si_3N_4 surface. Increase in sliding speed was supposed to have reduced the humidity effect on wear rate of Si_3N_4 by raising the temperature of both the bearing steel disk and Si_3N_4 pin specimen.