• Title/Summary/Keyword: abrasive wear

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The Effect of Abrasive particles on Brake Performance (자동차 제동특성에 미치는 연마제의 영향에 관한 연구)

  • Hong, Young-Suk;Jang, Ho
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2000.11a
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    • pp.332-340
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    • 2000
  • Friction properties of automotive brake pads containing different types of abrasivess were investigated. Five different abrasives, including o-quartz, magnesia, magnetite, alumina, zircon, were employed in this investigation and size effects of the abrasives on friction characteristics were also studied using 1, 50, 140$\mu\textrm{m}$ size zircon. Experimental results showed that the hardness and size of these abrasive particles were strongly related to friction behaviors and wear mechanisms. Harder and smaller abrasives showed higher friction coefficient and more wear. The surfaces of friction materials with different sizes of abrasives showed that two different modes of abrasion (two-body and three-body abrasion) appeared during sliding. Considering the above results, abrasive materials were thought to destroy transfer film and the extent of the destruction depends on the types and sizes of abrasive particles. A mechanism of the wear mode transition (two-body to three body abrasive motion) was suggested considering the binding energy and friction energy in terms of abrasive particle size.

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Study on Abrasive Wear Behaviour of a Carbon Fiber Composites (탄소 섬유 강화 고분자 복합재의 연삭마모 특성에 관한 연구)

  • Koh, S.W.;Yang, B.C.;Kim, H.J.;Kim, J.D.
    • Journal of Power System Engineering
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    • v.10 no.1
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    • pp.46-51
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    • 2006
  • Present study was investigated the effect of the particle of the counterface of unidirectional carbon fiber reinforced composite. The friction coefficient of composite and the specific wear rate different sliding velocity were measured for this materials. The friction track of counterface was observed by an optical microscope and scanning electron microscope. There were insignificant effects of the specific wear rate under lower Sic abrasive particle, however it showed high effect on $30{\mu}m$ abrasive particle size. There were significant effects of friction and wear behavior of the fiber direction under 0.3m/s sliding speed. Major failure mechanisms can be classified such as microfracture, plowing, microcutting, cutting and cracking.

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A study on abrasive wear characteristics of side plate of FRP ship (FRP 선박 외판재의 연삭마모 특성에 관한 연구)

  • Kim, Byung-Tak;Koh, Sung-Wi
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.44 no.3
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    • pp.250-256
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    • 2008
  • Generally the side plate materials of FRP ship are composed of glass fiber and unsaturated polyester resin composites(GFRP composites). In this study, the effect of applied load and sliding speed on friction and wear characteristics of these materials were investigated at ambient temperature by pin-on-disc friction test. The cumulative wear volume, friction coefficient and wear rate of these materials for SiC abrasive paper were determined experimentally. The cumulative wear volume showed a tendency to increase nonlinearly with increase of sliding distance and was dependent on applied load and sliding speed for these composites. The friction coefficient of GFRP composites was increased as applied load increased at same sliding speed in wear test. It was verified by SEM photograph of worn surface that major failure mechanisms were microfracture, deformation of resin, cutting and cracking.

The Wear Behavior and Cutting Characteristics of Coated Tools (코팅공구의 마모 및 절삭특성)

  • 정진혁;윤형석;최덕기;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.3-8
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    • 1996
  • To enhance the cutting performance of the tool, single or multilayer coating is applied on the substrate of the tool. Coating material reduces cutting force and heat generation in tool-chip contact zone and enhances resistance against abrasive wear. This paper presents that the effect of different coatings on abrasive wear resistance varies with work material and the flank wear rate is different with depth of cut. Crater wear rate is also found to decrease with higher thermal diffusivity of coating material. It is verified that the estimated thermal diffusivity of multilayer coating has consistent effect on the crater wear.

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INVESTIGATIONS ON THREE-BODY ABRASIVE WEAR BEHAVIOUR OF SILICON CARBIDE AND GRAPHITE FILLED GLASS-VINYL ESTER COMPOSITES

  • Suresha, B.;Chandramohan, G.;Siddaramaiah, Siddaramaiah;Lee, Joong- Hee
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.148-153
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    • 2007
  • The effect of silicon carbide (SiC) and graphite fillers incorporation on the abrasive wear behaviour of glass-vinyl ester (G-V) composites have been investigated. The three-body abrasive wear behaviour was assessed by rubber wheel abrasion tests (RWAT). The worn surfaces were examined using scanning electron microscopy (SEM). The addition of SiC and graphite fillers in G-V composite improves the abrasion resistance under different loads/abrading distances. The SEM studies indicate the reasons for failure of composites and influencing parameters.

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A Study on the Abrasive Wear Properties of the PTA Overlay Layers using the Super Alloy Powder (초내열합금분말에 의한 PTA 오버레이부의 연삭 마모 특성 연구)

  • Kim, Young-Sik;Choi, Young-Gook;Lim, Chang-Hoon;Kim, Jong-Do
    • Journal of Welding and Joining
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    • v.27 no.3
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    • pp.80-84
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    • 2009
  • The Plasma Transferred Arc (PTA) overlay welding method is lately introduced as one of the most useful surface overlay method of the engine component. In this paper, the overlay welding on the SNCrW heat resisting alloy was conducted by the PTA overlay welding process using the super alloy powder. The characteristics of the overlay layers were investigated through the metallurgical and abrasive test. Experimental results showed that the overlay on the SNCrW heat resisting alloy surface was successfully made without hot cracking. The friction wear characteristics of the Co-base Stellite 6 overlayer were most superior. However the abrasive wear characteristics were most inferior in the Co-base Stellite 6 overlayer.

Low streee Abrasive Wer mechanism of the Iron/Chromium Hardfacing Alloy (저응력하의 철/크롬 올버레이합금의 긁힘마모기구)

  • 백응률
    • Journal of Welding and Joining
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    • v.16 no.2
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    • pp.73-83
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    • 1998
  • This study investigated the relationships between the microstructure and the wear resistance of hardfaced iron/chromium alloys to examine the low stress abrasive wear mechanism. The effects of volume fraction of reinforcing phases(chromium carbide and eutectic phase) were studied. The alloys were deposited once or twice on a mild steel plate using a self-shielding flux cored arc welding process. The low stress abrasion resistance of he alloys against dry sands was measured by the Dry Sand/Ruber Wheel Abrasion Tester (RWAT). The wear resistance of hypoeutectic alloys, below 0.36 volume fraction of chromium-carbide phase (VFC), behaved as Equal Pressure Mode (EPM) for the inverse rule of mixture whereas the wear resistance of hypereutectic alloys, above 0.36 VFC, represented Equal Wear Mode (EWM) for the linear rule of mixture.

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Wear Characteristics of the Extruded Bars of Hypereutectic Al-Si Alloy Powders produced by Rapid Solidification Process (급속응고법으로 제조한 과공정 Al-Si합금분말 압출재의 마멸특성)

  • Ahn, Young-Nam;Cho, Gue-Serb;Ra, Hyung-Yong
    • Journal of Korea Foundry Society
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    • v.14 no.5
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    • pp.447-454
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    • 1994
  • Wear resistance and wear mechanism of hypereutectic Al-($15{\sim}40$)wt%Si alloys were investigated. Primary Si particles under $20{\mu}m$ size were formed in hypereutectic Al-Si alloy powders due to rapid solidification. But the Si particles of extruded bars were finely distributed in smaller size than that of atomized powders. The wear mechanism of hypereutectic Al-Si alloys was divided into three types of wear phenomena, which were abrasive wear, delamination wear and severe adhesive wear according to sliding speed and load. At low sliding speed and load, wear mechanism was abrasive wear, so Al-15wt%Si alloy showed the best wear resistance. At high sliding speed and load, wear mechanism was adhesive wear, and Al-40wt%Si alloy showed the best wear resistance.

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The Influence of Diamond Abrasive Size on the Life of Tungsten Carbide Wet Drawing Dies (다이아몬드 연마재 입도가 초경 습식신선 다이스 수명에 미치는 영향)

  • Lee, S.K.;Kim, M.A.;Ko, D.C.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.15 no.7 s.88
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    • pp.518-523
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    • 2006
  • Wet wire drawing of brass coated steel wire, used for tire reinforcement, is realized with Tungsten Carbide(WC) dies sintered with a cobalt(Co) binder. Dies wear represents an important limitation to the production process and cost savings. Several parameters, such as Co content, WC grain size of tungsten carbide, sintering conditions, and so on, affect on the wear of the drawing die. In this study, the effect of the diamond abrasive particle size on the life of the WC centered dies of the wet wire drawing was investigated. Wet wire drawing experiments were carried out on a wet wire drawing machine. From the experiments, the dies life, dies fracture, wire surface roughness, and wire breaks were investigated. From the results, it was found that the wear of the WC dies increased with the increase in the diamond abrasive particle size.

Resistance to Abrasive Wear of Materials Used as Metallic Matrices in Diamond Impregnated Tools

  • Konstanty, Janusz;Kim, Tai-Woung;Kim, Sang-Beom
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1132-1133
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    • 2006
  • Metal-bonded diamond impregnated tools are being increasingly used in the processing of stone and ceramics, road repair, petroleum exploration, etc. Although the main tool wear mechanisms have been identified, the scientific background is inadequate and fundamental research has to be carried out to better understand the tool field behaviour. This work addresses the complex issues of modelling abrasive wear of the metallic matrix under laboratory conditions. The generated data indicates that the matrix wear resistance can be assessed in a simple manner; whereas tests carried out on diamond impregnated specimens may aid prediction of the tool life in abrasive applications.

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