Abstract
Carbon composite is widely used in various fields, including the aerospace industry, electrical engineering, transportation engineering, etc. For electrified railways, the pantograph strip utilizes carbon composite as the current collector, which might bear multiple impacts from electrical, mechanical, or thermal aspects, from unwanted arcing, rain, and other diverse operation conditions. In this paper, a thermal shock damage experiment on the carbon composite of a pantograph strip was carried out. The thermal shock processes were realized by the adoption of muffle furnace heating and water cooling. The effect of thermal shock processes on carbon strip porosity, compressive strength, electrical resistivity, and surface topography were studied. In order to verify the mechanism of thermal shock damage to the pantograph strip, the porosity of the pantograph strip is discussed in detail. The results showed that the thermal shock process increased the porosity of the carbon strip and caused reductions in compressive strength and electrical resistivity. The multiple thermal shock processes caused irreversible damage to the pantograph strip, which was attributed to the spillover and scouring of large quantities of water vapor in the pores.
Highlights
Carbon composite has been widely used in various fields, including the aerospace industry [1], electrical engineering [2], transportation engineering [3], etc
Of thermal shock damage to the carbon composite is presented based on the systemic experimental results
We Porosity isthe onelaw of the basic physical properties of the pantograph strip
Summary
Carbon composite has been widely used in various fields, including the aerospace industry [1], electrical engineering [2], transportation engineering [3], etc. Carbon composite has been chosen as the key component of the current collector in electrified railway pantograph–catenary systems. In a high-speed electrified railway, the bullet train constantly acquires electric energy from the overhead catenary lines through a pantograph strip. As the unique piece of equipment used to acquire current, the pantograph strip is key to guaranteeing that the electric locomotive will run safely and steadily [4,5]. The pantograph strip is designed as a kind of lossy material for the purpose of protecting the catenary line. Loss from the pantograph strip comes from mechanical friction and arc erosion, which results mostly in a service performance reduction and even causes the fracture of the pantograph strip [6,7]
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