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Cu/QCr0.5 carrier friction and wear properties under study

Author: ZhangZuoLin
Tutor: SunLeMin
School: Henan University of Science and Technology
Course: Materials Processing Engineering
Keywords: Carrier Carrier Quality Arc energy Friction and wear Wear mechanism
CLC: TG115.58
Type: Master's thesis
Year: 2010
Downloads: 37
Quote: 0
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Abstract


In this paper, copper / chrome bronze friction, analog electric locomotives in catenary pantograph and catenary wire service conditions, in homemade HST-100 disc tribometer pin on the tribological properties of the carrier. Methods of using orthogonal carriers under the current conditions, load and speed of these three main influencing factors on the carrier Friction and wear properties of the degree, comparative study of the friction in the current conditions without friction and wear characteristics; Use single factor test method under the conditions investigated carrier friction and wear conditions, friction and wear properties, arc energy and the pin specimen surface temperature relationship. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) on the wear surfaces were observed under different conditions discussed carrier friction and wear mechanisms. Orthogonal test showed that current is affecting carrier Friction and wear properties of the most significant factors, load and speed second. Compared with no current, load current conditions different speeds in the same load tend to decrease the friction coefficient, wear rate is high; with different loading rate also decreases the friction coefficient, wear rate is high; at different current conditions, As the current increases, the friction coefficient decreases, and the wear rate increases. The pin under different conditions the surface temperature of the sample changes the friction process is not the same, but must go through a first increases rapidly, then a smooth process. Different parameters and transfer off the sample surface temperature reaches the steady state value is not the same. At different speeds in the same load with current conditions, the surface temperature of the sample increases sales lower coefficient of friction, wear rate increases; currents with different speeds in the same load conditions, the pin specimen surface temperature friction and wear and friction complex relationship between the performance and the load of 0.26MPa eliminated when the surface temperature of the sample reaches a maximum; at different speeds with the current conditions of the same load, the surface temperature of the sample increases pin lower coefficient of friction and wear rate increases. Tests showed that both the sample and the pin arc energy is closely related to the surface temperature, the greater the arc energy, the steady state off the sample surface temperature is greater. On the wear surface microscopic analysis showed that: no current conditions, pin specimens main wear mechanism is adhesive wear, and load current conditions, wear and tear off the sample surface there are plenty of traces of adhesive and plastic flow, and you can see that there are melted, ablation pit marks and cracks due to thermal stress-induced, energy spectra can be obtained by both the worn surface of oxygen generation, description oxide formed on the surface friction. Therefore, the main wear mechanism is adhesive wear, oxidation wear and arc erosion.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Mechanical properties ( mechanical properties ) test > Friction and wear test
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