• Title/Summary/Keyword: Anti-wear

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Lubricating performance of vegetable oils as environmentally friendly fluids

  • Mimura, K.;Mitsumune, S.;Minami, I.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.10b
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    • pp.341-342
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    • 2002
  • Although vegetable oils provide good lubricity, they still need optimization by certain additive technology for practical applications. ZDTP improve antiwear properties of vegetable oils. However the additive performance depends on quality of the base Oil. Antioxidants were applied to prevent the auto-oxidation of vegetable oils. Good synergistic effect of anti-wear and antioxidant additives was confirmed.

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Investigation of anti-wear additives for synthetic esters; Amine salts of phosphonic acid

  • Hasegawa, T.;Minami, I.;Kidera, Y.;Hirao, K.;Memita, M.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.10b
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    • pp.269-270
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    • 2002
  • Antiwear(AW) properties of phoshphonic acid derivatives for trimethylolpropane (TMP) esters were investigated under boundary conditions. AW effect of dialkyl phosphonates depends on polarity of base fluid. They provide good AW performance in less polar TMP esters, whereas their AW effect is not sufficient in polar TMP esters. Amine salts of phosphonic acid were developed as new AW additiνe system for TMP esters. They provide excellent AW performance even in polar TMP esters.

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A Study on the Engine Oil Life for Small Size Single Cylinder Engine. (단기통 소형 엔진의 엔진오일 수명에 관한 연구)

  • 정동윤;신성철
    • Tribology and Lubricants
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    • v.11 no.3
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    • pp.40-47
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    • 1995
  • The engine oil life was examined experimentally for small size single cylinder engines. This study was conducted in the laboratory. An Eddy Current type engine dynamometer was used with a motorcycle and a cultivator engine. Physical and chemical properties of used oil was analyzed to examine the oil life. Flushed oil was used for the reference instead of the new oil. It were found that deterioration of dynamic viscosity and anti-wear property of engine oil was due to dilution by fuel not depletion of ZDTP.

Optimal torque control of noncontact type eddy current brake system (비접촉식 와전류형 제동 장치의 최적 토오크 제어)

  • 이갑진;박기환;류제하
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.261-264
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    • 1997
  • A contactless eddy current type braking system is developed to take advantages of the recent brake system which uses hydraulic force can show high efficiency in a certain velocity region, but not in a high velocity region, and has initial response delay time and pressure build-up time which make stopping distance longer. These are the limits of mechanical brake system of a contact type, which makes a concept brake system required. So, in this paper, the contactless brake system .of a inductive current type is chosen instead of hydraulic brake system. This brake system can be used almost forever for being no wear and contributed to lightening weight of a vehicle. Besides, the contactless brake system can be used as that of electric or solar car with anti-lock brake system. The analysis of induced electromotive force and braking torque obtained with theoretical approximate model, the design of a braking system and a nonlinear controller, and the results of simulation of the ABS, experiment are included.

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Develvopment of Infeed Grinding Machine and Its Effects on Spherical Surface Grinding (구면 전용 Infeed 연삭기의 개발과 성능평가)

  • 이상직;정해도;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1028-1032
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    • 1995
  • This paper describes the manufacture of spherical and aspherical surface on glass, superalloy and ceramic components. The rotationally symmetricallenses, and the ceramic or superalloy molds with spherical shapes are mainly generated by cutting processes on CNC lathe machine or 4,5 axis CNC machining centers. Recently, spherical shape parts require more precise and efficent machining technologies for wide material range such as optical lens of the lithography device in semiconductor manufacturing processes or the high precision mold machining of anti-chemical, anti-wear materials. In this paper, we introduce a newly developed infeed grinding machine with metal with metal bonded cup type wheel and its effects on spherical surface grinding.

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Study on vehicle application of biodegradable hydraulic oils from the point of tribological evaluation technology (Tribology 관점에서 생분해성 유압작동유 실적용 평가에 관한 연구)

  • Na ByungChul;Kim JinYong;Seo JoonHo
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2004.11a
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    • pp.367-371
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    • 2004
  • Bio-degradable hydraulic oil using polyolester base oil is formulated for the applications of heavy duty hydraulic machineries. It has proved quality and market price competitiveness by assessment of reliability test in vehicle manufacturer and specific vehicle related institute. Contribution of bio-degradable oil keep the working environment clean and increase export competitiveness in European market. Leakage or waste of mineral types of hydraulic oils in heavy duty machineries causes pollution of river, ocean, underground water. Drinkable-water pollution is serious problem in Europe. In some European countries, using bio-degradable hydraulic oils become an obligation in heavy duty machineries. New product of bio-degradable oils satisfy the European regulations(OECD 302B) and shows excellent performance in compare with European products.

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Plasma Assisted Nitriding of Stainless Steel Type 304L (304L 스테인리스 강의 플라즈마 질화처리)

  • Park, J.R.
    • Journal of the Korean Society for Heat Treatment
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    • v.8 no.4
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    • pp.255-265
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    • 1995
  • Stainless steel type 304L has been nitrided in the low pressure (600Pa) and high nitrogen (80% $N_2$+20% $H_2$) environment for 5 hours by the square-wave-pulsed-d.c. plasma as a function of temperature $400{\sim}550^{\circ}C$ and pulsation. At the lower temperature range of $400{\sim}500^{\circ}C$ and at the relatively high ratio of pulse duration to pulse period. "S-phase" has been developed in the form of thin nitrided surface layer which has many cracks, leading to be nearly impossible for the industrial anti-wear and anti-corrosion applications. At the higher temperature up to $550^{\circ}C$ with the increasing ratio of the pulse duration to pulse period up to $50{\mu}s/100{\mu}s$, the nitrided layer, whose growth rate has increased also, has been composed mainly of CrN and $Fe_4N$ phases and has become thick, uniform and nearly crack-free.

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The Study on the Improvement of Friction Properties of Graphite/Nylon Composite by oil-Impregnation (오일 함침에 의한 흑연/나일론 복합체의 마찰특성 향상에 관한 연구)

  • Gang, Seok-Chun;Jeong, Dae-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.114-122
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    • 2002
  • Electric conductivities, mechanical properties and friction properties were investigated far graphite-nylon composites impregnated with oil. Specific resistivity of composites containing oil from 2% to 6% were in the range of $10^7 ~10^6 \ohm$ cm, which were applicable for anti-static purpose of composites improved by the impregnation of graphite with 2%. Improvement in the impact strength and friction properties of graphite/nylon composites was achieved by the impregnation of oil. The coefficient of friction of the composites containing graphite from 2% to 4% and oil with 2 - 4% showed much loller than that of virgin nylon. Also the abrasive wear of the oil impregnated graphite composites were decreased about 1/3 - 1/10.

Study on Properties of Antimony-doped Tin Oxide Thin Films Prepared by Sputtering (Sputtering 방법에 의해 제조된 Sb가 도핑된 주석산화물 박막의 특성에 관한 연구)

  • 김층완;김광호;이환수;이혜용
    • Journal of the Korean Ceramic Society
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    • v.33 no.7
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    • pp.735-742
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    • 1996
  • Antimony-doped Tin oxide (ATO) thin films were deposited on soda-lime glass substrates by DC magnetron sputtering technique. Effects of DC power film thickness and post heat-treatment on electrical conductivity of ATO film were investigated. Other properties of ATO film such as optical anti-chemical and wear properties were also reported in this work. The obtained ATO films showed electrical resistivities ranging from 5$\times$10-3 $\Omega$cm to 3$\times$10-3 $\Omega$cm with the average optical transparency above 80% in visible wavelength range and excel-lent anti-chemical properties where the electrical resistivity was not changed even after soaking the films in 1M HCl or 1M NaOH solution for 10 days. These properties were found to be related to the crystallinity of ATO film and the films having higher crystallinity showed better properties.

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