• 제목, 요약, 키워드: Specific Wear Rate

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운전속도에 따른 플라스틱기어의 마멸특성 (Wear Characteristics of Plastic Pinion Against Steel Gear for Different Pitch Line Velocities)

  • 김충현;안효석;정태형
    • 대한기계학회논문집A
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    • v.25 no.11
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    • pp.1720-1729
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    • 2001
  • Wear characteristics of Nylon and acetal pinions against steel gears for different pitch line velocities was studied with a power circulating gear test rig under unlubricated condition. Specific wear rate was measured as a function of tooth number, module, tooth width and total revolution. The worn tooth surfaces were examined with a profile projector. The Nylon pinion showed lower specific wear rate than the acetal pinion. However, the Nylon pinion was fractured at high tooth loads, whereas the acetal pinion exhibited a steady wear behavior. The wear characteristics of Nylon pinion varied significantly with the Pitch line velocity. Wear occurred most severely at the tooth tip and the region immediately below the pitch line of pinion. The dominant wear mechanisms were adhesion and abrasion.

산성환경 중에서 구상흑연주철재의 마멸-부식거동에 관한 연구 (The Study on the Wear-Corrosion Behavior of Ductile Cast Iron in the Acidic Environment)

  • 임우조;박동기
    • Tribology and Lubricants
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    • v.18 no.4
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    • pp.299-304
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    • 2002
  • This paper reports the studies on the wear-corrosion behavior of ductile cast iron in the acidic environment. In atmosphere and variety of pH solution, specific wear rate and wear-corrosion characteristics of GCD 60 with various sliding speed and distance were investigated. And electrochemical polarization test of GCD 60 was examined in the environment of various pH values. The main results are as following : As the contact pressure increases, the critical velocity of specific wear rate becomes transient at low sliding speed. As pH value becomes low, wear-corrosion loss increases in the aqueous solution. As the corrosion environment is acidified, corrosion potential of GCD 60 becomes noble and corrosion current density increases.

Wear Behaviors of Ceramics TIN, TIC and TICN with Arc Ion Plating

  • Oh, Seong-Mo;Rhee, Bong-Goo;Jeong, Bong-Soo
    • Journal of Mechanical Science and Technology
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    • v.17 no.12
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    • pp.1904-1911
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    • 2003
  • In order to determine the wear properties of AIP (Arc Ion Plating) deposition, wear process was evaluated by using a Falex test machine. Also, in order to determine the effects of coating material on the wear process, TiC, TiN, and TiCN coatings of thickness about 5 $\mu\textrm{m}$∼6 $\mu\textrm{m}$ coated by Arc ion plating deposition method were tested. The wear property was determined under a dry sliding condition as a function of the applied load, sliding distance, sliding velocity and temperature. The results show that when wear of the coating-layer occurred, specific wear amount increased with the wear rate. At initial state, the wear rate rapidly increased, but it gradually reduced as the velocity increased. Also, when raising the temperature, the wear rate increased in the order of TiCN, TiN and TiC due to the frictional heat.

오버레이 용접법에 의한 Al-Cu 합금 경화후막의 특성 (A Characteristics of Thick and Hard Al-Cu Alloy by Overlaying Welding Process)

  • 박정식;양변모;박경재
    • Journal of Welding and Joining
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    • v.14 no.4
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    • pp.53-61
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    • 1996
  • It was attempted to improve the wear resistance of Al alloy under the load condition by making a formation of the thicker surface hardening alloy layers. The thicker surface hardening alloy layers were formed on 6061 Al alloys overlayed by MIG and TIG welding process with Cu powders feeding. The characteristics of hardening and wear resistance have been investigated in relation to the microstructures of alloyed layers, with a selection of optimum alloying conditions for formation of overlaying layer. The results obtained were summarized as follows With increasing feeding rate of Cu powders by MIG welding, the hardness and specific wear of the overlay weld alloys were increased. It is considered that these high hardness and specific wear of overlay weld alloys were due to the formation of Θ($Al_2Cu$) phases. With increasing feeding rate of Cu powders by TIG welding, the hardness and specific wear of the overlay weld alloys were increased in feeding rates 12 and 18g/min. However, the hardness and specific wear were decreased in the powder feeding rate 38g/min. It is considered that considered that decrease of hardness and specific wear in the powder feeding rate 38g/min due to formation of ${\gamma}$($Al_4Cu_9$) phases.

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첨가제에 의한 PTFE 복합재료의 마찰마모 특성에 관한 연구 (A Study on the Effects of Additives on the Friction and Wear Properties of PTFE Composite)

  • 김용직;김윤해
    • Composites Research
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    • v.13 no.4
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    • pp.11-18
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    • 2000
  • 본 연구는 공기압축기에 적용되는 피스턴링의 재료에 자기윤활성 재료를 이용할 경우 어떠한 마찰마모 특성을 나타내는가를 비교평가 함으로써 실제 적용여부의 가능성을 확인하였으며, 주요 결과로는 동을 중량비 30% 함유한 시험편이 평균마찰계수 및 비마모량이 가장 적었다. 이는 마찰계수에 직접적인 영향을 주는 마모유동막이 조기에 다량 생성될 경우 낮은 마찰계수와 함께 안정화 효과에 큰 영향을 주며 비마모량은 발생된 마모유동막의 경도와 비례하고 용융마모에 의해 덩어리 형태로 탈락되는 마모분이 가장 적기 때문이라고 생각된다.

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Al$_2$O$_3$-TiO$_2$ 플라즈마 세라믹 코팅과 초경합금간의 미끄럼 마멸특성 (Sliding Wear Behavior of Plasma-Sprayed $Al_2$O$_3$-TiO$_2$ Coating against Cemented Carbide)

  • 이병섭;채영훈;김석삼
    • 한국윤활학회:학술대회논문집
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    • pp.313-318
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    • 2001
  • The sliding wear behavior of Plasma-Sprayed Al$_2$O$_3$-TiO$_2$ Coating against Cemented Carbide were Investigated using a pin on disk type tester. The experiment was conducted using Al$_2$O$_3$-TiO$_2$ Coaling as pin material and Cemented Carbide as disk material and different operating conditions, at room temperature under a dry conditions. The results showed that the type B(250kw power) appeared average wear rate Is lowed than type A(80kw power). The specific wear rate of Specimen A1 Increased with normal load. But The specific wear rate of Specimen B1 decreased with normal load. Average wear rate of specimen A3, B3 are lowed than other but the sliding wear mechanism of edge were rough.

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무급유 공기압축기용 복합재료 피스턴링의 마찰마모 특성에 관한 연구 (A Study on the Friction and Wear Property of Composite Piston Ring for Oil Free Air Compressor)

  • 김용직;정하돈;김윤해
    • 대한기계학회:학술대회논문집
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    • pp.766-771
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    • 2000
  • This study is mainly concerned with friction and wear properties for the piston ring of non-lubricating air compressor which made of PTFE-polyimide composites. At the PTFE and polyimide alone mixture specimens, PTFE80%-polyimide20%, which shows the lowest men friction coefficient and specific wear rate at 0.94m/s sliding speed. At each of carbon, copper and oxide lopper mixed with PTFE80%-polyimide20%. In case of copper10%, at 0.94m/s sliding speed, the mean friction coefficient shows 0.087, which is the lowest value in all specimens. In case of the specific wear rate, copper30% specimen shows the lowest value of $2.537E-5(mm^3/Nm)$ in all specimens.

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디젤엔진용 실린더 라이너 소재의 고온 마모특성 (Wear Characteristics of Cylinder-Liner Materials for Diesel Engine at Elevated Temperature)

  • 김진열;김재훈;오광근;이승학;장준용
    • 대한기계학회논문집A
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    • v.39 no.11
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    • pp.1131-1136
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    • 2015
  • 선박 디젤엔진용 실린더 라이너는 피스톤 링과 지속적인 왕복운동을 통해 마모가 발생한다. 마모는 디젤엔진의 성능을 저하시키고, 사용 수명을 단축시킨다. 본 논문은 선박 디젤엔진용 실린더 라이너의 GT 금속 및 기존 금속에 대하여 마모특성을 평가하였다. 마모시험은 상온, $175^{\circ}C$, $325^{\circ}C$의 온도조건과 10 N, 30 N, 50 N 의 하중조건에서 수행되었으며, 마모량, 비마마율 및 마찰계수를 평가하였다. 또한 각 조건에 대한 마모메커니즘을 분석하기 위해서 SEM 분석을 수행하였다. 두 금속 공히, 상온에서 연삭 및 응착마모가 진행되었고, 고온에서 부식마모가 발견되었다. GT 금속은 기존 금속 대비 모든 온도 범위에서 마모량 및 비마모율이 작고 마모특성이 더 우수하다.

Friction and Wear of Nano-Sized Silica Filled Epoxy Composites

  • Kim, Jae-Dong;Kim, Yeong-Sik;Kim, Hyung-Jin
    • 한국동력기계공학회지
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    • v.18 no.6
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    • pp.174-179
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    • 2014
  • The wear behavior of epoxy matrix composites filled with nano sized silica particles is discussed in this paper. Especially, the variation of the coefficient of friction and the specific wear rate under the various applied load and sliding velocity were investigated for these materials. Wear tests of pin-on-disc mode were carried out and followed by scanning electron microscope observations. The presence of silica filler in epoxy composites was demonstrated significant influence on the friction and wear behavior of epoxy nanocomposites. With the incorporation of silica filler into the epoxy matrix, reduction of the coefficient of friction and specific wear rate were identified. Wear mechanism was discussed by analyzing the worn surface by scanning electron microscope as well.

나일론과 폴리아세탈의 왕복동 마찰마멸특성에 관한 고찰 (Reciprocating Sliding Wear of Nylon and Polyacetal Against Steel)

  • 김충현;안효석;정태형
    • 대한기계학회논문집A
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    • v.24 no.3
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    • pp.786-793
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    • 2000
  • Nylon, Polyacetal and PTFE were studied to gain a better understanding of their tribological behavior. Wear tests were conducted with reciprocating motion under dry sliding conditions. Friction coefficient and specific wear rate were measured as a function of sliding distance. The worn surfaces were examined with a Scanning Electron Microscope(SEM). Polyacetal showed lowest specific wear rates and PTFE exhibited lowest friction coefficient. The dominant wear mechanism found were adhesion and abrasion.