권호 표지

Tribology and Lubricants

Korean Tribology Society (KTS)

  • Bimonthly
  • /
  • 2713-8011(pISSN)
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  • 2713-802X(eISSN)

Aim & Scope

Tribology and Lubricants (Tribol. Lubr.) is a peer-reviewed open access journal published by the Korean Tribology Society (KTS). The aim of the journal is to advance the science and technology of tribology by disseminating high-quality and novel research works on tribology and related fields. The scope of the journal encompasses all aspects of tribology and its applications including the following topics: friction, wear, fluid film lubrication, elastohydrodynamic lubrication, liquid and solid lubricants, lubricant additives, nano/micro-tribology, tribo-chemistry, surface properties and characterization, coatings, surface engineering, contact mechanics, tribo-systems, seals, bearings, gears, metalworking, biotribology, friction noise, friction-induced vibration and other related topics. The papers related to these topics will aid in advancement of core mechanical technologies for various industries such as Aerospace, Automotive, Marine, Transportation, Data Storage, MEMS/NEMS, Biomedical, Home Appliance, Mining, Machine Tool, Manufacturing, Construction Machinery, Heavy Equipment, Power Generation, Energy Systems, Condition Monitoring, etc. Tribology and Lubricants publishes papers of theoretical and/or experimental contents that are based on original research, invited special topic, industrial research, case study and reviews of state-of-the-art topics. TOPICS Automotive Tribology Bearing, Seal & Gear Tribology (Tribology of Machine Elements) Bio-Tribology/Biomimetics Chemical Mechanical Polishing Condition Monitoring & Maintenance System (System Reliability) Contact Mechanics & Friction Eco/Green Tribology (Renewable/Alternative Energies) Education & Training in Tribology Lubrication (Lubricants & Additives) Marine Tribology Micro/Nano-Tribology Modeling & Simulation in Tribology Nuclear Tribology Space/Extreme Tribology Surface/Interface Tribology (Treatment & Coatings, Texturing, Modification) Tribochemistry Tribology Applications (Industrial Case Studies) Tribology in Design & Manufacturing (Metalworking, Machining) Tribology in Transportation (Railway, Road) Tribology of Materials (Characterization, Polymer Tribology, New/Smart Materials) Tribo-Testing, Measurement & Instruments Wear Phenomena & Mechanisms

http://journal.tribology.kr KSCI KCI

Volume 9 Issue 2

  1. 이성철 1
    https://doi.org/10.9725/kstle.1993.9.2.001 PDF
    기어가 비교적 큰 하중과 고속의 운전상태에서 사용되는 경우 되풀이 응력에 의한 피로를 대상으로 하는 면압이나 굽힘강도 이외에 치면에서 발생되는 긁힘이나 융착(瀜着) 또는 용착(溶着)을 대상으로 한 스코어링(scoring) 강도를 고려하여야 한다. 스코어링은 주로 치의 이끝 부분에서 접촉방향으로 긁힘이 나타나는 손상으로 특징지워진다. 미국기어제조협회(AGMA)에서는 윤활막 파손에 의한 금속과 금속과의 접촉에 기인하여 발생되는 여러형태의 손상, 예를 들면 scuffing, seizing, galling 등을 광범위하게 스코어링으로 통칭하고 있다. 미국계통의 기술분야에서는 스코어링을 고온 스코어링(hot scoring)과 저온 스코어링(cold scoring)으로 구분하고 있다. 고온 스코어링은 고속 운전시 표면의 섬광온도(flash temperature)에 기인한 용착과 접촉방향으로 재료를 이탈시키는 형태를 나타내고, 저온 스코어링은 저속의 기어에서 윤활막 파단으로 표면에 줄질(filing)한 듯한 손상이 발생되는 것을 나타낸다. 유럽에서는 고온 스코어링 손상은 스커핑이라 하고 저온 스코어링손상만을 스코어링이라 부르고 있다.
  2. 남창현 9
    https://doi.org/10.9725/kstle.1993.9.2.009 PDF
    최근 전력공급의 질적인 향상 요청으로 전력 설비의 안정성에 대한 요구가 날로 증대되고 있으며, 특히 변압기의 신뢰성 향상과 사고의 미연방지를 위한 예방 또는 예측진단기술의 중요성이 크게 인식 되고 있는 실정이다. 변압기는 운전중에 각부가 열화등으로 전기, 기계적인 성는이 저하되어 이상이 발생되는 겅우가 있는데, 그 이상을 사전에 검지하여 적절한 조치를 취하지 않으면 중대한 사고를 일으키는 수가 있다. 이러한 사고를 미연에 방지하기 위해서는 이상의 징후를 초기단계에 검출하여 이상의 내용을 정확히 파악하고 대책을 수립할 필요가 있다. 이러한 이상유무를 진단하는 많은 방법들이 실용화 되어 있는데, 변압기와 같은 유입기기의 이상진단 방법중 가장 효과적인 보수관리법으로서 유중가스 분석에 의한 방법을 들 수 있으며, 국내외의 여러 전력회상서 채용하여 사고예방에 크게 기여하고 있는 것으로 조사되어 있다. 따라서 본 란에서는 유중 용존가스 분석에 의한 변압기의 일반적인 내부이상 수소가스에 의한 진단법에 대해서 그 진단기술의 이론적 근거와 진단장치의 구성 등을 중심으로 기술하고자 한다.
  3. 최주환;전용진;최웅수;권오관 16
    https://doi.org/10.9725/kstle.1993.9.2.016 PDF
    Alkylbenzenes used as the synthetic lubricant base stocks were composed of the mixture of the various kinds of aromatic hydrocarbons. Their compositions have affected on the quality of synthetic alkylbenzene lubricants. Therefore, the rapid and accurate methods for the composit ional analysis are important. In this study, the compositions of the alkylbenzenes (Hv. LAB, FHv. LAB, Hv, BAB, DAB[HF], DAB[$AlCl_3$]) as synthetic base stocks have been investigated according to six average structural parameters(Tar, Nal, Asub, $\bar{n}$, nb, $T\alpha$) in the view of the molecular structures by $^{13}C-NMR$ spectroscopy. The experimental results of the oxidation $\varepsilon$ thermal stability tests have been related to the results of the molecular structural analysis.
  4. 하현천;김경우;김영춘;김호종 22
    https://doi.org/10.9725/kstle.1993.9.2.022 PDF
    The experimental investigation on the inlet pressure of a large tilting pad journal bearing is studied. The continuous distribution of the film pressure and film thickness are measured along with the shaft speed and bearing load for various flow rates. Considerably large inlet pressure is observed at the entrance of each pad, especially lower pads. The inlet pressure increases with the increase of shaft speed as well as bearing load, but it is almost independent on the folw rate and the oil supply temperature. Because of the inlet pressure, the upper pads always keep up slight wedge film shape which are almost parallel to the journal surface, and spragging is not observed in the upper pads with no preload.
  5. 하현천;김경웅;김영춘;김호종 29
    https://doi.org/10.9725/kstle.1993.9.2.029 PDF
    The thermohydrodynamic(THD) performance of a large tilting pad journal bearing in laminar and turbulent flow regions is investigated experimentally. The continuous shaft surface temperature, and bearing surface temperature are measured along with the shaft speed and the bearing load for various flow rates. It is observed that the shaft surface temperature is constant in the circumferential direction and increases with the increase of shaft speed in both low and high shaft speed region, however, there exist transition region where the shaft surface temperature decreases with the increase of shaft speed. When the turbulence occurs in the lubricant film, both the inlet and maximum bearing surface temperature steeply increase and the temperature gradient in the circumferential direction decreases.
  6. 강석춘;신성철;김동길;노장섭 36
    https://doi.org/10.9725/kstle.1993.9.2.036 PDF
    This study is concerned with the changes (deterioration) of the mechanical properties of used oil in the gasoline engine. The analysed properties of used oil were friction, antiwear, wear debris, load-carrying ability and the formation of surface film. From this study, it was found that the oil used in engine was deteriorated to increase the wear and fricion and decrease the load-carrying ability as the running distance of oil was increased. Also the main cause of deterioration was related to the formation of the protective film on the contact zone. When the film was composed with rich additives (sulfur), this could properly protect contact zone from the increase of wear and friction. But as oil was deteriorated, it could not form such a film and therefore the protective ability of sliding surface diminished.
  7. 이상로;허무영 49
    https://doi.org/10.9725/kstle.1993.9.2.049 PDF
    The dry sliding wear properties of the sintered Cu-10 wt%Sn bronze alloys reinforced with $SiC_w$ and $SiC_p$ were investigated by a pin-on-disc wear testing machine. The worn surfaces and the cross sections of the wear specimens and the wear debris were observed by SEM to study the effect of the variation of the ceramic phase contents in the composite and the wear condition on the wear behaviors. The wear of bronze matrix was dominated by the adhesive wear. The transition from mild to severe wear was found in the bronze matrix specimens at the applied load higher than 20N where the surface delamination caused the severe wear. The addition of $SiC_w$ and $SiC_p$ reinforcements in the romposites was proved to reduce the wear rate by the matrix strengthening at the applied load higher than 20N. SiC whiskers having a large length to diameter ratio which hold the deformed matrix were effective to hinder the crack propagation near the worn surface. Thus the maximum wear resistance was obtained in the composite reinforced by $SiC_w$ at the higher applied load.
  8. 홍택기;허무영;임대순;안성욱 56
    https://doi.org/10.9725/kstle.1993.9.2.056 PDF
    Al-Pb-Cu and Al-Si-Pb-Cu bearing alloys were produced by forced-stirring method and water-cooled copper mold casting to investigate the effect of the precipitation hardening on the wear properties. Sliding of produced alloy pin against a steel disc were performed under various applied loads. Lowering the wear rate and material transfer phenomena were explained by the strengthening of $\theta'$ precipitates on AI matrix. The transmission electron microscope observation reveals the role of the precipitates in the alloys with Cu. The movement of dislocations was hindered by precipitates which resulted in the reduction of plastic deformation at the worn surfaces.
  9. 이기현;김경웅 63
    https://doi.org/10.9725/kstle.1993.9.2.063 PDF
    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.
  10. 김청균;김희붕 70
    https://doi.org/10.9725/kstle.1993.9.2.070 PDF
    Using the finite element method, the film pressure, the transverse force and the firction torque which are distributed over the pad surface of low-friction piston skirt are calculated in order to investigate the dynamic characteristics of the piston. The results indicate that the frictional torque for the low-friction piston pad may increase 3% efficiency in comparison th the conventional one.