본 연구에서는 건조 마찰, 윤활제가 부족한 경우의 경계 윤활, 윤활제가 충분한 경우의 경계 윤활 상태에 대한 실험을 수행하여 각 윤활 상태에서의 요철표면의 성능을 알아 보고 요철 표면의 요철 표면의 성능에 영향을 주는 주된 요인을 알아보았다.

Friction and wear characteristics of metals in dry and boundary lubricated sliding conditions are observed experimentally using pin-on-disk and pin-on-plate type tribotesters. The motivation of this research is to investigate the effect of sliding history on the tribological behavior of metals. Cu and SM45C steel materials were used for the experiment. The results show that in dry condition the fictional behavior as well as wear of the specimens differed between uni-directional and bi-directional sliding conditions. The friction coefficient values, wear profile and optical micrograph of the wear track are presented.

Examined in this paper is the effect of B$_{4}$C addition on the frictional characteristics of Cu-Sn based sintered friction material. For the specimens 1%, 2% and 4% of B$_{4}$C were added into the reference material. A pin-on-disk type friction tester was used to measure the friction and wear with respect to the surface temperature and sliding distance. Wear mechanism of each specimen is analyzed in the view point of the oxide film formation. The specimen containing 4% of B$_{4}$C showed stable friction and low wear since the oxide film was sustained up to higher surface temperature ranges.

본 논문에서는 하중부와 방법을 추(dead weight)와 공압(pneumatic)을 이용한 방법에서 스프링을 이용한 방법을 추가하였으며, 압축형 스프링을 선택적으로 사용하여 마찰시험기 수직방향에서의 강성을 큰 변화 폭으로 변화시켰다. 또한 선행된 연구를 통하여 수직하중의 변동량에 크게 영향을 미치는 것으로 알려진 바 있는 디스크 시편의 misaligment 효과를 상사하고 극대화 하기 위하여 본 논문에서는 경사진 디스크 시편을 추가로 사용하였다. 상기조건으로 마찰시험기 시스템의 각 하중부과 방법과 수직강성 변화가 마찰특성에 미치는 영향을 실험적으로 측정 평가하였으며, 마찰시험기 동특성계 모델의 이론적 해석을 통하여 마찰특성 변화를 고찰하였다. 또한, 미끄럼 접촉 시의 수직력과 마찰력을 측정하고, 데이터의 통계적 처리방법에 따른 마찰계수의 변화 특성도 평가하였다.

Friction and wear test for non-asbestos material against cast iron drum were carried out to investigate the friction and wear characteristics of brake system. Its friction coefficient and wear volume were measured and compared with those of asbestos friction material. The experiment. was perforated tinder room temperature and various sliding conditions. After each experiment, the sin-faces of friction materials were observed by SEM.

In this paper, the effects of the film tinckness, pre-treatment and testing load on. the tribological characteristics have been studied. During the "Ring on-Disk" testing period silica-gel was used to remove the effect of humidity. As a result, increasing the film thickness revealed prolonged wear life, in the case or reasl the testing loads the dynamic friction coefficient was decreased gradually but in regarding the wear life, an intermideate contact pressure (4kgf/mm${2}$) revealed the maximum value. In regarding the surface protuberance friction an intermediate value of area fraction (60%) revealed maximum wear life. In this paper, the qualitative model in regarding the variation of the friction coefficient andworn depth was presented.presented.